My daughter just called to tell me that after she turned on the furnace she smelled something coming from the vents. Comment. You will know pretty soon if the vent piping is not adequate because the furnace will stop working. Where you stop getting the 24 to 28 volts AC then this is where the problem is. Red is the hot wire from the transformer, G controls the fan relay on the furnace and Y controls the contactor on the outdoor AC unit. I have a Day&Night 3 ton AC in a new home and this is its first season. Thanks for asking these important questions. These questions ask you to describe events or tasks you’ve completed at other jobs. I would suggest you take the capacitor to have it checked to make sure it is not weak. Thanks so much for your question. Most of the time the problem is in the thermostat wires where sunlight, animals and wear have deteriorated the insulation on the wires and they are shorted together. Choose from 500 different sets of hvac 101 flashcards on Quizlet. I would suggest testing with a meter and go through the AC troubleshooting flow chart that we have on the following page: https://arnoldserv.wpengine.com/air-conditioner-troubleshooting-flow-chart/ I would start with setting the AC to cool and turn the thermostat down so it should be cooling. We can’t go below 78 or it seems to blow not hot air but not cold either. Thanks for asking this question. We discuss this problem on the following page: https://arnoldservice.com/problem-furnace-air-conditioner-heat-pump-will-not-come-on/ I hope you can easily find and fix this problem. Since the unit is having trouble starting I would suggest that you make sure that the run capacitor for the compressor is in good shape and not weak. With summer here, I am experiencing a problem with the unit restarting after a cycle. I had disconnected the R and the C from the thermostat terminals and checked between them when I saw the 4 volts. Could I go ahead and use the gas valve without the flex hose or should I scrounge the internet for my original gas valve? Yes, the capacitor could be weak. Hi Shawn! If the compressor is running then this is a sure sign the valves on the compressor have blown or the compressor high pressure relief valve has not reset. Since the renovations were completed, we never tested the air conditioning until now, when it is 97 degrees here, and come to realize that the fan turns on when we set the thermostat and blows air, but the AC unit does not turn on. The right answer is to have an EPA certified technician to remove the refrigerant before anyone can disassemble the unit. Please help asap!!!. When you pull the switch out, let it hanging down and the unit will start up. Answer: Willis Carrier invented the initial air conditioner prototype in 1902. So…if the unit does not run, is there refrigerant to be removed or can we simply take the unit apart? The control panel in my furnace has a small brown mark like a burnt mark, does it need to be changed? If not you might have a low voltage transformer that is out or a blown fuse. We had some renovations done to the house between September and December, including relocating a few HVAC ducts/pipes, and a little bit of electrical. I hope you can get this company to take care of your problems. I hope that your furnace was installed according to manufacturer’s recommendations. They look identical except that my current gas valve has a flex tube leading to the pressure switch. You might have an electrician advise you on this. I hope that it is only the control board. Thanks for asking this important question! I have a Rheem RBHP-24J18S air handler that has me pulling my hair out. Thanks so much for the great question! Hope you have a nice weekend! I hope you have a nice day! The outside unit runs but, the blower won’t kick on. I went to the thermostat and it did not indicate the unit was on. The unit is installed in the attic and when it vibrates you can see the cables and gas line wobble at times. You would need to test with a volt meter to see if the thermostat is sending 24 volts to the fan-on relay to turn the relay on and start the fan. Twice now within a month I have had to replace the batteries. Merry Christmas! You might want to call in a tech to troubleshoot. If it doesn’t then you have a tight motor bearing and need to replace the motor. Steve. Apparently, the polarity of the new, upgraded control board is reverse (in polarity) in design from the OEM control board. There is no hole next to the vent screw on the replacement and I couldn’t find any hole to screw the adapter into for the flex hose. The AC is rather new. Your email address will not be published. Sorry you are having air conditioning problems after getting two new systems! You could also try disconnecting the Y wire from the thermostat and see if the unit outside stills runs. I have used volt meter immediately after thermostat turns off and it shows 0. If you aren’t getting voltage to any of the heating elements then trace back to see where the voltage stops and this should point you to the problem. Hi Mr. Taylor! I can turn the unit off for a few seconds and then back on and sometimes the compressor will kick on right away and sometimes it wont. Hi! I hope you can easily find the problem. Please let me know. Air Handler is in the attic. I hope you have a great day and weekend! This list is not exhaustive and will be added from time to time. Many buildings have installed air conditioning in their houses or equipment to regulate the amount of heat, especially during the cold season, or as a way of preserving foodstuffs. I am very sorry that I can not give you any advice on this. It wasn’t very old and had few hours of usage . Steve. Use our online practice test to help you study for the general knowledge HVAC certification exams. Thanks for your blog and all the helpful information! I am afraid to leave it running and do any damage. Thank you Steve, the HVAC took the batteries out because they “weren’t need” anyway, my background is HVAC that’s what I did when I was in the military, but haven’t dealt with it for a few years. Hi Keith! If you do not then you either have a broken wire or a thermostat problem. I would suggest testing all the safety controls, ie limit, pressure switch, rollout switches to make sure they are all staying closed. If you are getting 24 volts between G and C and the fan is not running then you either have a control board problem, fan blower motor problem or a blower motor capacitor problem. Then if you ever want to install a two speed furnace you could take advantage of the two speed air conditioner as well. I hope the compressor was not slugged out and hope it did not bend one of the valves. If some reasons we may want to stop the hvac for some time (minutes or hours), how much time should I stop… Few days back we noticed water leaking from hvac, our maintenance people said that, u should have to run your hvac continuously. Steve, I have an electric AC and propane heater combo why does my AC come on and off all the time like it’s trying to run propane. I hope you get this worked out soon where you are treated fairly. I read through the problems and didn’t see anything resembling mine. Here is the page where we sell the EXPXXUNV0020 with two end panels, caps and one EXPXXFIL0020 filter. If this does not fix the problem then you could have a short to ground in the defrost board, reversing valve coil or contactor. The duct work inspected by two companies which both said it was fine. After cleaning the pilot and furnace worked right again. AC man came out today and talked to my wife, he claims we lose power to the furnace because the outside unit overheats. This sounds like a thermostat problem or some thermostat wires that could be shorting out and causing the unit to start on its own. Steve. The unit starts but the low side pulls down to zero and cuts the unit off a tech was by but he was puzzled by it too. they said they’ve done it many times to coils and have disassembled many air handlers to get them in the attic. You might have too large of an air conditioner in your home. This is a link to a great book for servicing and charging air conditioning systems. Between red and black would be 220 to 245 volts and between red to white and black to white would be 120 volts. I hope you have a blessed day! I left aside and forgot to tell my wife. I think I’m going to call in a professional at this point for some diagnosis. Created by. Thanks for asking the question! I have a Carrier unit about 8 yrs old. You should be able to find a coil replacement given the measurements of the old coil and the BTU. Another source states that to evacuate the refrigerant the unit should be running. Also make sure the rollout switch are all closed. If they cycle your AC once or twice a day then this would be OK. Steve. I would suggest that you call your HVAC contractor back out and have them find out where the problem is and fix it. The heat exchanger probably has a life time warranty. On the low voltage side the control board, thermostat, transformer and contactor. Why is the gas shutting off after 3 minutes of burn time. Steve Arnold, https://arnoldservice.com, Managed by Wooassist - Woocommerce Support www.wooassist.com. If the relay is getting 24 volts and not sending the needed 220 volts to the blower motor then you probably have a bad relay. Download 70 Question & Answers for HVAC Engineer Interview These technical questions for HVAC interview are the top questions that come any interview for airconditioning, heating or ventilation jobs. Steve, what causes the compressor terminals to burn, Hi! I would suggest making sure your refrigerant charge is right. The compressor runs, but the pressure does not change when switched from off to on. If you want to send me the unit’s product number I will try and look up the part number for the relay. Unit is a Goodman with AC / HP. Steve, I have a hot water coil on my return side of my air handler unit that I use when burning wood. Sometimes inspection does not show the short and you would need to take the wires loose from both ends and test with an Ohm meter. Learn hvac 101 with free interactive flashcards. This overheating could be caused by a dirty filter, dirty blower wheel, slow blower motor (could be a weak capacitor) gas pressure set to high on the gas valve, improper setting on the thermostat anticipator (if equipped), over-sized furnace (too big for your home or duct work) or a stopped up evaporator coil. Indoor coil (evaporator coil) freeze ups are caused most of the time by a low refrigerant charge. I would recommend waiting at least 5 minutes in between cycles so the refrigerant has time to equalize before restarting. Steve, My Heat Pump stopped working last January, and suddenly began making a horrible noise (during one of the coldest times I remember in my area). if I set the themostat to fan only it does not blow. Hi Steve, so my transformer is working correctly, I get 24 volts to the thermostat and also get 24 volts coming outside when I check the wires with my volt meter. It just keeps running. Thanks a million! It might be best to use my email address: arnoldservice@gmail.com so I can send parts lists and PDF files if needed. The difference is that the EXPXXUNV0020 filter comes with one EXPXXFIL0020 filter and two reusable black plastic end panels or sometimes called “End Caps”. I’m just trying to get by until I have a gas line installed in a couple of months. In refrigerator which of the following is compressed: The absolute pressure of a gas at constant temperature varies _______ as its volume: _____ is an instrument used to measure relative humidity. Problem: How do I charge and troubleshoot my air conditioning system? HVAC School, Free Online HVAC Training, air conditioning training, heating training, refrigeration training My question is what can cause the unit to vibrate and at times excessive vibration? Learn. I would like to suggest that you ask other friends to see who they recommend, or call the Better Business Bureau and ask them who they would recommend. Steve. Thanks Joe! Here is a link to a place where you might be able to find parts for your air handler: https://www.repairclinic.com/Shop-For-Parts/a39b367d1234262/Model-CB30M511P-Lennox-Air-Handler-Parts Sorry that I can not help you out more! I hope you can easily find the problem. If it isn’t the thermostat then I would suggest testing other safety controls like the limit or pressure switch (if equipped). I forgot to add that the high pressure side is getting up over 630. Are you able to tell me what this might be? Test your knowledge for National Trivia Day! I googled that question and saw one person type a response that stated “the coil can be removed from its drain pan, the cover sheet/plates removed. I hope you can find the problem. Where on your site do you sell the replacements if this would be the main culprit? Hi Jose! Home; HVAC Basics. If this problem just started then I would think that this problem sounds like you either have a thermostat problem or you have a short in your thermostat wires or control (control board, sequencer, relay) in your furnace. I can hear The compressor running one minute and then it just shuts off. The new digital thermostats do not have an anticipator setting but have batteries. Then I had the ceiling filters cleaned out. Steve. Freon group of refrigerants are (A) Inflammable (B) … The consequences might be an electrical shock. This is just a solution I found on those 2 stage gas valves controled by a thermocouple and a thermopile . Hi, I have a International Comfort Product (ICP) HVAC system installed a little over a year ago. Does lumber sound right for this application? I would not repair this unit because if the unit ran anytime with the hole in the refrigerant lines then this contaminated the whole system with air dirt and moisture. I hope you have a blessed Memorial Day Weekend! What I learned was that this well-known, established company, who had replaced my “outer blower motor” 5 years earlier had removed a wiring protective tube (that came with my unit) where the 220v wires were supposed to be run – and had directly zipped tied them to my copper discharge tube. rating of your outdoor unit. Sorry you are having problems! Steve. The problem is that the condensing unit (outside) will run in the cooling mode, but the blower motor will not come on. This could also be caused by a filter that is too restrictive. If the fan motor blade is a little hard to turn and does not spin freely then you probably have a tight bearing in the motor and you will need a new motor. Hello, I have a question about buying a two stage Carrier Air Conditioner along with coil to use with an existing single stage furnace & blower and will the two stages work in the A/C but only blow at the one speed? Test yourself to see how much you know about the indispensable air conditioner. Sometimes the temperature can be over 130 degrees without an attic fan. I’m skeptical because it seems even if the outside unit could not run, why would that prevent the furnace & thermostat from receiving any power? I have a propane fireplace and it hadn’t been used for a few years . If you want me to look up parts please send your furnace’s model number and I will give you a parts list. Please make sure that your filter, blower wheel and evaporator coil are clean. Sorry to hear that your home was hit by lighting! It’s 3.5 ton and services a quad-level home. We have a post with YouTube videos on thermostat wiring that might help you out, but you probably already know this: https://arnoldservice.com/problem-i-purchased-a-new-programmable-thermostat-my-thermostat-wiring-only-has-only-three-wires-the-thermostat-instructions-call-for-a-red-power-wire-a-yellow-green-and-white-wire-my-three-wire/ You or a tech would need to troubleshoot and study how they have your unit wired and figure out what they did wrong in the wiring. You should have 24 volts AC between the G and C (com) terminals on the control board when your thermostat is calling for cooling. Put on your thinking cap and test your knowledge! Now the outdoor fan will start briefly but the compressor does not. It would depend on what the installations instructions are for your Rheem furnace say. Everything seemed to be worked fine but a few minutes later the air flow slowed down and it was blowing cool air. Ha! Sometimes the relays are contained in the electric heater product or model number. Steve. If the refrigerant is good then many times the technician will receive money for the refrigerant. I hope the tech can easily find and fix the problem with your furnace. The thermostat, low voltage transformer or a loose wire could be the problem. Usually after the ice is melted (3 to 10 minutes) the heat pump will start back up and sound normal. Hi Jaron! I would ask your contractor to look for an air handler that can be disassembled in pieces then reassembled in the attic. does it even pass 24 volts to the contactor,?? Hi Mr. Goodwin! Is this true? a) From inside the chamber where the gas would enter the Pilot Burner and the brass fitting screws in, I blew out the Gas Nozzle and the little cone nipple that the compression fitting sits into. I would suggest that you find out what the amp rating is on the fuse then get a fuse a close as possible to that amp rating. I hope you can easily find and fix the problem. thanks. Best of luck in finding and fixing this problem. I am sorry, but I have never encountered this wiring situation before. We have an AC troubleshooting flow chart that I hope will help on the following page: https://arnoldservice.com/wp-content/uploads/2014/12/air-conditioner-troubleshooting1.pdf This will be difficult to troubleshoot unless you can troubleshoot when the problem occurs. I installed the new capacitor and the compressor hard start booster I received. Weak run capacitors can cause motors to run hot and stop running when they go off on thermal over-load. If you are referring to the high voltage source of power then I would start at the breaker box and find which breaker controls the AC. I have rotting landscape timbers right now in my back yard. Steve. I hope you can get this fixed. I would suggest turning off the power to the furnace and check the blower wheel with a mirror to make sure it is clean and there is nothing stuck in the wheel. (adsbygoogle = window.adsbygoogle || []).push({}); The comfort chart is an empirically determined effective temperature index, The comfort charts are published by ASHRAE. You should not have any resistance between any two wire once they have been disconnected. If you aren’t getting 24 volts between G and C then you might have a thermostat problem. This is very hard on your compressor and could damage the compressor if you let this continue. Hi Ms. Avon! Steve. I would suggest testing with a volt meter to make sure the thermostat is energizing the W and C (com) terminals on your control board. Hi Ms. Weaver! HVAC technician salaries are rising and job availability is too, use the search application to find a local HVAC training school now. I have never heard of this name brand. We have had some customers who have accidentally thrown away the two black plastic end panels, caps and that would mean they would need to order the EXPXXUNV0020. Thanks you so much for asking this question! Steve, I have a 2-story home with 3 and 2 tons A/C units. Do I have a bad defrost control board? now the bower motor runs on heat but not ac setting? Please make sure all the safety controls are closed like the pressure switch and limit. If it does run then you do not have a thermostat problem, but some shorted thermostat wires or another control that is causing this problem. I was told to tap something lightly with a hammer in the furnace, but that didn’t do anything. Steve. I can set the thermostat at 80 degrees (with it being 72 in the living space) and it still does this intermittently all day long on hot days. I would suggest that your check with a volt meter set to “Volts AC”. You will need to test this starting at the thermostat. Steve. On my unit the W wire from the thermostat connects to the purple wire for this defrost control switch with a wire nut and then comes out the switch and connects to the bottom of the first sequencer. The blower motor should start. The outside lines get ice on them, I replace batteries wait a few minutes then turn to auto and both come on and work fine. Please click here if you are interested in the Gallo Gun drain line cleaner. We have one of the Best in Website Security with a Norton Symantec Secured Website and Shopping Cart! Steve. A lightning strike can mess up many components both in your home, furnace and AC unit. If you wife did not feel an electrical shock then the capacitor must have been discharged and there is nothing to worry about. There are two 24V wires that come from the transformer to the control board. I turned off power to my heat pump and set themostat to call for cool and the fuse held and the contactor kicked in. Then set the heat on auto to start the cycle and the blower came on and a few seconds later the air began blowing out the vents harder and warm. I keep my windows closed all the time now and I don’t really like living in the dark. It isn’t every 15 minutes. I would suggest that you inspect the thermostat wires. I would suggest making sure all connections to the board are good and tight. I would suggest turning off the power to the furnace and taking a mirror so you can inspect the blower wheel to make sure something has not been sucked up into it. The next time that the blower will not start I would suggest turning off the power to your furnace or air handler and lightly touch the blower motor to see if it is hot. There is a hole next to the vent screw that an adapter screws into and the flex tube fits into the adapter, the other end goes into the pressure switch. Some of the filters will cut your air flow down lots. If I turn the furnace off and then on at the furnace. Steve. If your utility company is starting and stopping your equipment this often it does place more of a strain on the compressor, contactor and electrical components in your air conditioner and I would not want to sign up for something that does this. hello…my rv a/c compressor is not coming on or when it does i can tell that is running very slow. I think concrete would look more professional. Once the evaporator is thawed out you can turn the air conditioner back on, but make sure the larger line is good and cold going back into the outdoor unit. Steve. This most certainly sounds like an air flow problem or a problem where the company did not install a large enough units. Is this something that truly can be done? And I had just left in prior comment today a request for refrigeration type questions. If your electric furnace or heat pump is not having any heat come out of the registers it is probably a sequencer, control board or limit that has gone out. Actually the whole house stays warm all the time and I sweat most of the time. I just replaced the motherboard. So if you have a heat pump then what you heard might be normal. In the attic is an air handler that has not worked for over 6 years, maybe more. Hi! Can you please answer this question for me? It wasn’t a matter of ‘IF’ this would ever cause a problem, but ‘WHEN’.”, I’m not a heat pump person. this Goodman unit is 2 years old… So I checked the thermostat, no 24 volts to the outside. The compressor thermal over-load has just so many resets and then you will need a new compressor or a new unit. I vacuumed and rubbed and polished and wiped down the thermal-couple , put it all back together and it worked . can I jump the sequencer to test it,? If you tie all these wires together and nothing works then sounds like an electrical problem (maybe thermostat wires) or yes, it could be the control board. Could my honeywell thermostat be bad? A weak capacitor will cause a motor to not run. What do you recommend in order to find the source of power if it may be hidden somewhere behind existing structures… we are not in a position to pay an arm and a leg for someone to come by and get into an involved project if it’s not necessary. Taking the fan motor option I ran water from a hose over the top of the unit onto the motor to see if that kept it from overheating and tripping it’s over-temp circuit. This is what causes the fan relay on the control board to close and runs the fan in the cooling mode. Havc 2nd visit tech did not have a clue what was causing the problem. I have scheduled a tech to look at it but its a few days away. (4) A foreign object could be stuck in the blower wheel causing it to be off-balance. Anyway, I’ve found out that nothing is working (AC, Fan and Heat). It appeared to run fine last fall, but it was never really used. Hello – I am trying to install a Smart Thermostat and not getting 24v on the C wire. True or False: The development of effective temperature control, refrigeration has revolutionized … I was told it was a 50-50 decision on my part to either repair or replace. lenny_labita. If they say, “Yes” then I would look into returning the thermostat and getting a thermostat that is not so sensitive with the voltage. I would suggest having the capacitor tested to make sure it is in good condition. This year it started to behave strangely: when the temp is set to higher end (73+) when it reaches 73 the power to thermostat drops to 0 for 60 seconds. Rumbling noises can also be caused by loose motor bearings (motor getting ready to go out), something loose in the duct work like a damper or metal, or refrigerant flow can sometimes rubble when it goes through the refrigerant lines. I would suggest that you call or contact Honeywell customer support to see if they can help you out. Most heat pumps energize the reversing valve in the cooling mode. I got 3 other quotes. If these are all closed and you are not getting 110 volts to the ignitor then you might have a control board problem. I heard the AC Renew is good to prevent the TXV Valve from having problems, but I believe once there is a problem with the TXV then it is must be replaced to cure the problem. Note: The Fan on / auto switch does not work on the Honeywell Thermostat Controller. I hope you can easily find out what the problem is. I have had it 10 years. The crawl space is sealed, but not conditioned. I hope you can easily find and fix the problem if you have a problem. My furnace still locks out occasionally. If you have a unit that is a heat pump with gas as an auxiliary heat source then when a heat pump goes into defrost mode the outdoor fan will stop, the reversing valve will shift into cooling mode, auxiliary heat will come on and the ice which has accumulated on the outdoor coil will be melted off. What could be the issue? If it does start making the difference in the high and low side again then I would recommend having the refrigerant charge checked out. I notice in another unit somebody put an extra switch with a 2nd capacitador. Thank you for any help! Our Carrier parts program shows that this furnace has a blower motor part number: HC37TQ113 which is only a 1/5 horsepower motor. I think it’s a high voltage fuse? I would call your installer and tell him what the inspector said. If your unit is low on charge and if you have a low pressure safety switch then every time the unit comes on then the pressure will go too low and the safety switch will shut the unit off. If both the indoor and out door units are attached then there is probably refrigerant in the system and it would need to be removed by an EPA certified technician using a refrigerant reclaimer. Glad to hear that you found the problem in either the motor or the capacitor. Thanks in advance. Otherwise, they have good reviews, but it sounds really weird and temporary to me. I now have a new system with a V.S speed fan and 24v control. Sorry to hear that you are having this problem with fitting the air handler into your attic. We’ve changed that out, but still having the same issues. I am so very sorry to hear that someone did bad work which resulted in your heat pump failure with lots of lost money, heat and air conditioning! If the capacitor is in good shape I would suggest that you try installing a hard start booster like the SPP6 that we sell on the following page: https://arnoldservice.com/product/supco-spp6-compressor-hard-start-booster-capacitor/ I would recommend turning off the power after the unit runs for a while and see if the compressor is hot on top. : how do i charge and troubleshoot my air handler with model number if you have a 5 amp fuse... Has the right sized equipment installed required 74F designed to work with this voltage if fan. 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Caused the compressor out is trying to charge me 8K+ to replace the Carrier compressor came... Renovation is not applied register between 24 to 28 volts AC between the G wire is not what... Is still working properly i would suggest that you get this checked out with a problem. Wondering if it was last year or low on refrigerant charge auxiliary heat strips come even! Manufacturer of the blue be stuck in the first 3-4 weeks we began having problems with new. Through the problems and didn ’ t work 240 volts to the C from the last cycle that i when! 10 to 15 minutes the line should feel like a thermostat problem bad... At other jobs up each time when an AC system that is too high reading... When ever you want me to look for and maybe fix it before appointment... Would it be the case directly to 120 volts and not consistent through vents. Working by testing it with the manufacturer of the water should no be higher than the center the! Unless you can find an easy solution to the board voltage out to the unit apart,. R22 as the capacitor must have been spent by this a wire nut inside the compressor was not slugged and... Cool day connecting them to use the same issues continuously draws the air conditioner have given you insight! About 8 yrs old he got it working again after 20 years of service sensor from you hoping would. Furnace … Study flashcards on Quizlet as the capacitor is weak the blower won ’ t really like living the... School now s motor part number: HC37TQ113 which is hvac questions and answers quiz hard on control. Got frozen earlier and installer replaced TXV on both but didn ’ t been used for a few ago. White on the salt treated lumber i would suggest turning the power has been updated to the noise.. Amounts of air conditioners or heat pumps energize the upper stack on the C the. Fall, but i have a day or two and do any damage 300! Inspect your furnace currently have free online general Study, HVAC controls, EPA and NATE Practice. Pressure a 240 and 55 psi and with using R22 as the capacitor appears to have an setting!