I turned off power to my heat pump and set themostat to call for cool and the fuse held and the contactor kicked in. The warning is there to prevent the compressor from possible valve damage that could occur if any liquid refrigerant has migrated, and is sitting inside the compressor. If the capacitor has three terminals, use the same procedure to create a short circuit between each terminal and then from each terminal to ground. Choose from 500 different sets of hvac 101 flashcards on Quizlet. If the outdoor unit has already been removed and there is no refrigerant in the system, then you would not need to call in a technician to remove the refrigerant. I would suggest that your check with a volt meter set to “Volts AC”. 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. If not you might have a low voltage transformer that is out or a blown fuse. Answer: Willis Carrier invented the initial air conditioner prototype in 1902. Yes, the capacitor could be weak. What might be the problem? 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. It’s 3.5 ton and services a quad-level home. This most certainly sounds like an air flow problem or a problem where the company did not install a large enough units. (4) A foreign object could be stuck in the blower wheel causing it to be off-balance. Hello – I am trying to install a Smart Thermostat and not getting 24v on the C wire. Thanks so much for your interest in our website! I hope you can easily find the problem. Set your thermostat so the heat is on and check with your volt meter between the W and C (com) terminals you should be getting 24 to 28 volts AC between these two terminals until the temperature that is set on the thermostat is achieved. So far it hasn’t quit, (about an hour now and still running…) So guess I’ll swap out the motor & capacitor… Again, thanks for the help!!! Steve. So I would need the heater model number to look up the parts. Twice now within a month I have had to replace the batteries. Best of luck in finding and fixing the problem. Hi Mr. Longmire! I had two HVAC companies come and look at the system and they tell me that what I have is standard and can’t change it. 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. Thanks for asking these important questions. Steve. I also noticed after turning on the AC that after the cooling cycle is over and the compressor shuts off the blower continues to run for a minute or so…like the heater should do after the heating cycle is complete. You should be getting 24 to 28 volts AC between the green and C (com) wire when the thermostat is calling for cooling. I would also ask the company if they can turn the blower speed up because you are not getting adequate air flow. Learn hvac 101 with free interactive flashcards. Hi Mr. Goodwin! Air Conditioning and Heat Pump Troubleshooting Simplified, Air Conditioning & Heat Pump troubleshooting questions with answers index, Furnace troubleshooting questions with answers index, Gas & Electric Furnace Troubleshooting Simplified. You should be able to find a coil replacement given the measurements of the old coil and the BTU. 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. When you pull the switch out, let it hanging down and the unit will start up. 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. 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. This is just a solution I found on those 2 stage gas valves controled by a thermocouple and a thermopile . Hi Rich! I sure do appreciate your nice comments! I’m just trying to get by until I have a gas line installed in a couple of months. Steve. Another source states that to evacuate the refrigerant the unit should be running. Steve. Steve, When turning on A/C after it’s been off for an hour or so it works fine, all pressures and temps normal at compressor and compressor fan running good, (with cool air coming through the vents). thanks. I purchased a flame sensor from you hoping this would solve my furnace lock-out problem. The outside unit runs but, the blower won’t kick on. Please make sure you check the blower motor capacitor to make sure it is in good shape. You might have a short to ground in one of your low voltage controls or thermostat wires. 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. Hope you have a nice weekend! I would suggest you take the capacitor to have it checked to make sure it is not weak. It might be best to use my email address: arnoldservice@gmail.com so I can send parts lists and PDF files if needed. Did the company do a heat gain, heat loss calculation before installing the new systems? Your email address will not be published. I had the AC serviced, coils cleaned and etc. If it isn’t the thermostat then I would suggest testing other safety controls like the limit or pressure switch (if equipped). Steve. Thank you so much!!! Comment. On our furnace the control board and draft inducer are real expensive over $250 each. if I set the themostat to fan only it does not blow. About 10 minutes later, I heard the unit come back on! Use our online practice test to help you study for the general knowledge HVAC certification exams. They look identical except that my current gas valve has a flex tube leading to the pressure switch. 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. 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. 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. My daughter just called to tell me that after she turned on the furnace she smelled something coming from the vents. I read through the problems and didn’t see anything resembling mine. 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. If this does not fix the problem then you could have a short to ground in the defrost board, reversing valve coil or contactor. Here is the video from YouTube https://m.youtube.com/watch?v=Lbg2awS-RRM, Just wondering your thoughts or if you have had any experience with this product, my system does not have a txv Thanks Regan, Hi Regan! These questions ask you to describe events or tasks you’ve completed at other jobs. It makes a loud hissing/blowing sound sometimes. A weak capacitor will also cause a fan motor to stop. Jan, Hi Jan! 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 had a contactor come out and they said they are unable to widen the access door because it would require cutting one of the trusts that are holding up my roof. 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 am very sorry that I can not give you any advice on this. I hope you have a nice day! Here’s what I found out. b) Took Sand Paper to the strike plate and wet sanded it back to bare metal again. Hi Mr. Judd! Or could it be bad wiring? Lightly touch the blower motor to see if it is hot. Also make sure the rollout switch are all closed. Hi, I have a International Comfort Product (ICP) HVAC system installed a little over a year ago. I got 3 other quotes. If the thermostat isn’t getting 24 volts after the 3 minutes then you might try adjusting the anticipator if equipped. Or do you know of any other options? The compressor runs, but the pressure does not change when switched from off to on. I now have a new system with a V.S speed fan and 24v control. We discuss this problem on the following page: https://arnoldservice.com/problem-air-conditioning-outdoor-condensing-unit-or-heat-pump-unit-will-not-shut-off-it-continues-to-run-no-matter-what-you-do/ Another cause of quick contactor failure would be if your unit is low on charge and the low pressure safety switch is shutting the unit off an on. This all started with the flame sensor being replaced. Air Handler is in the attic. In the installation instructions (every furnace should have this with a new furnace) the manufacture will have recommendations on what size vent pipe and how many 90 degree turns are allowed. does it even pass 24 volts to the contactor,?? Please click here to see the capacitors we sell. Created by. She touched the prongs not knowing. I noticed that there was no LPG odor so I went online and came across this web-site: You would need to test some controls to see what the problem is. 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. 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. Problem: How do I charge and troubleshoot my air conditioning system? 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 would ask your contractor to look for an air handler that can be disassembled in pieces then reassembled in the attic. Here is a good YouTube video that discusses metering devices. Note: The Fan on / auto switch does not work on the Honeywell Thermostat Controller. When I installed my own furnace and AC at my home I paid to get a permit so there will be no questions asked when I want to sell our home in the future. Please click here if you are interested in the Gallo Gun drain line cleaner. As you know, I bought the S1-33102956000 which has been updated to the S1-33103010000 control board for my York P2MP furnace. I am sure that when you figure out what they did with the wiring that you will like the Sensi thermostat as well. 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. I live in a high humidity hot summer and cold ice and snow winters. I hope you can easily find and fix the problem. The capacitor appears to have been spent by this. It would depend on what the installations instructions are for your Rheem furnace say. We cleaned the evaperator on the inside of the outside unit it was dirty but that was not the problem it is still pulling the low side down to zero and cutting the unit off…, Hi Mr. Brown! Can I stop hvac…, Hi! Thanks a million! Test the controls to make sure they are staying closed when the furnace shuts off after the 3 minutes. Steve, Replace expansion valve on evaporator vacumn unit started charging unit had 150 on suction line turned unit on pressure dropped to 20 suction line frosted up unit shut off unit won’t run long enough to charge 410-a system, Hi Mr. Vuorela! This happened last year a few times, this year it is much worse – is happening daily. I was told to tap something lightly with a hammer in the furnace, but that didn’t do anything. 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. Hi, I recently had a Rheem direct vent furnace installed with 2″ PVC with an approx 30′ run to exterior. Hi Jose! Sometimes the relays are contained in the electric heater product or model number. 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. Otherwise, they have good reviews, but it sounds really weird and temporary to me. HVAC School, Free Online HVAC Training, air conditioning training, heating training, refrigeration training Yes, you are correct, in order to get the cool refrigerant gas coming back to the compressor from and evaporator on the 2nd floor, they might of had to over-charge the unit thus making the compressor have a hard time starting. Learn. If the motor is pretty hot you might have a blower motor problem (might need a new motor) or the motor might need a new run capacitor. My air unit is only 5 years old. The thermostat, low voltage transformer or a loose wire could be the problem. I hope you have a nice day! If this be the case then you will probably need a new fan motor. I got a Carrier HVAC outside unit that keep burning the contactor It was working fine then, start switching off and on. Now we feel poor/weak airflow from most of the vents. If you are getting 24 volts between G and C and the blower motor is not coming on then I would test the low voltage going into the fan relay. Test your knowledge for National Trivia Day! and the coil can then be squeezed together some to make it fit through the attic access. Or would you suspect something else? 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. 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. Home; HVAC Basics. I had disconnected the R and the C from the thermostat terminals and checked between them when I saw the 4 volts. This is very hard on your compressor and could damage the compressor if you let this continue. Is that normal? I forgot to add that the high pressure side is getting up over 630. What are likely solutions to get the system up and running? Freon group of refrigerants are (A) Inflammable (B) … Steve. I would try to contact the manufacturer of the thermostats and ask them if it would harm the stat if they receive 27 volts. I hope you have a blessed day! Thank you in advance for any suggestion. Steve. I have a Rheem RBHP-24J18S air handler that has me pulling my hair out. Glad to hear that you found the problem in either the motor or the capacitor. I removed the connection from the board and stop. Then this last time I was checking the furnace. Freeze ups can also be caused by a dirty blower wheel, dragging motor (might need a new motor run capacitor) or a dirty evaporator coil ( might need to clean the under side of the coil). I moved the thermostat from “cool” to “off” and the unit still would not turn off! I would suggest making sure all connections to the board are good and tight. Hi Cathy! Tech did not have any idea what was causing the vibration. Test yourself to see how much you know about the indispensable air conditioner. Hi! So they do not recommend utilizing the two-stage AC with a single stage furnace or air handler. It wasn’t very old and had few hours of usage . If it doesn’t then you have a tight motor bearing and need to replace the motor. I hope the tech can easily find and fix the problem with your furnace. Sorry you are having problems! Any suggestions? The most common cause most of the time is because the system is low on refrigerant charge. 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. Put on your thinking cap and test your knowledge! Check to see if you are getting 110 to 125 volts AC to the blower motor when the thermostat is calling for cooling. Do I have a bad defrost control board? Unit is a Goodman with AC / HP. The contractor wants to eliminate the outside electrical box. Is this something that truly can be done? We turn the unit off for HOURS and then it will work fine for a day or two and do it again. Thanks so much for asking this great question. Then I had the ceiling filters cleaned out. Where you stop getting the 24 to 28 volts AC then this is where the problem is. 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. 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. Another idea would be to only replace the evaporator coil and not the entire air handler. Duct work is in crawl space. You might want to call in a tech to troubleshoot. Most of the time it is from a loose connection. It is code here in Louisville, KY. to have a heat gain and heat loss calculation submitted to the housing department before they will issue a permit. Inside and outside ciols aren’t clogged. We can’t go below 78 or it seems to blow not hot air but not cold either. Hi Shawn! Please click here to see the SPP6 compressor hard start booster, Thought you’d be interested. The heat strips come on but not the blower. 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. I live in Southwest Missouri and for the most part our winters are fairly mild. Hi! I am sorry, but I have never encountered this wiring situation before. 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! Steve. Steve. Reverse these two wires…put the white on the XFMR lead and the light brown wire on the neutral lead….and then the furnace will work. I would suggest checking the voltage drop to make sure you are getting at least 110 volts out of your generator or home AC electric service when the AC compressor tries to start up. (adsbygoogle = window.adsbygoogle || []).push({}); The comfort chart is an empirically determined effective temperature index, The comfort charts are published by ASHRAE. I hope you have a great day and weekend! I hope you can get this fixed. Any suggestions what to do or who to call. Could it be the blower, fan, wheel, bearing etc. Best of luck in finding and fixing the problem. Are you able to tell me what this might be? I have also seen stopped up metering devices like restrictor pins or thermostatic expansion valves that will cause this to happen. I hope this helps you out. HVAC technician salaries are rising and job availability is too, use the search application to find a local HVAC training school now. They are replacing air handler in attic, coils, etc. Sorry to hear that you are having this problem with fitting the air handler into your attic. I hope you have a great day and week! The problem is that the condensing unit (outside) will run in the cooling mode, but the blower motor will not come on. Recently these units are replaced along with both furnaces. This problem can be hard to find, unless you can troubleshoot the problem when it occurs. Hi Byron! If these are all closed and you are not getting 110 volts to the ignitor then you might have a control board problem. What is going on? Could my honeywell thermostat be bad? I notice in another unit somebody put an extra switch with a 2nd capacitador. 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. Most of the 95% furnaces are pretty complex so you might want to call a tech if something goes wrong. You will need to test this starting at the thermostat. 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. I would be afraid to hook the motor directly up to 120 volts AC because some of the high efficiency motors are ECM DC motors. Could I go ahead and use the gas valve without the flex hose or should I scrounge the internet for my original gas valve? Steve Arnold, On a RUDD heatpump with the entire unit on the outside. Our Carrier parts program shows a compressor part number SRD480HC scroll compressor. Can you advise? Steve. It is very hard on the compressor to run without enough refrigerate because a low on charge system will allow the compressor to over-heat, melt the compressor motor windings and burn the compressor up over time. Steve Arnold, https://arnoldservice.com, Managed by Wooassist - Woocommerce Support www.wooassist.com. I hope you can easily find and fix the problem. With the pressures 140 and 150 this shows that the compressor is not doing its job and not making the difference in the high and low side. I am afraid to leave it running and do any damage. It’s a split system and I noticed the R22 was let out somewhere near the bottom of the compressor. If you do not have the dip switches then I do not know what to tell you. You should not have any resistance between any two wire once they have been disconnected. I have a 94% Bryant furnace and I like to keep an ignitor, flame sensor, control board and draft inducer on hand. I just replaced the motherboard. The temperature of the air coming out of the registers should be at least a 15 to 20 degree difference from your indoor ambient temperature. The fan comes on; 30 seconds later the pilot light comes on; 30 seconds later the fan goes off; 6 seconds later the burner comes on; 65 seconds later the fan comes on; 1:30 seconds later the burner goes off; 1:20 seconds later the pilot light comes on again; this then repeats. I have a question. If they cycle your AC once or twice a day then this would be OK. We have processed over 25,000 Successful PayPal Orders! On the high voltage side the compressor and fan motor. We are Accredited Better Business Members with an A+ Rating! this Goodman unit is 2 years old… So I checked the thermostat, no 24 volts to the outside. I would suggest that you call or contact Honeywell customer support to see if they can help you out. There are two 24V wires that come from the transformer to the control board. And I had just left in prior comment today a request for refrigeration type questions. 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. Most of the time shorts in thermostat wires occur near the outside unit where the wires are exposed to sun and animals that can chew through the wires. rating of your outdoor unit. I had a new propane tank installed and went to lite the pilot and it wouldn’t stay lit . It appeared to run fine last fall, but it was never really used. It just keeps running. My home was hit by lightning last week. I think concrete would look more professional. If you do not then you either have a broken wire or a thermostat problem. The compressor thermal over-load has just so many resets and then you will need a new compressor or a new unit. I have never heard of this name brand. 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. 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. If the compressor does not start working right again then you will need a new compressor. I was really hoping it was the float valve given there is some water in the pan but that valve seemed OK. 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. I called my Bryant Carrier supplier and they said that you could install the two stage Carrier AC with a single stage furnace, but the AC (outdoor unit) should only work on one speed. If you aren’t getting 24 volts between G and C then you probably have a thermostat or a thermostat wire problem. So…if the unit does not run, is there refrigerant to be removed or can we simply take the unit apart? I have scheduled a tech to look at it but its a few days away. 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. Anyway, I’ve found out that nothing is working (AC, Fan and Heat). I hope you can easily find and fix the problem if you have a problem. Please click here if you would like to see our: How to test and troubleshoot gas furnace pressure switches page, https://arnoldservice.com/problem-air-conditioning-outdoor-condensing-unit-or-heat-pump-unit-will-not-shut-off-it-continues-to-run-no-matter-what-you-do/, https://www.carrier.com/residential/en/us/products/ductless-systems/ras-lav-lkv/, https://www.youtube.com/watch?v=8VtbJldahOI, https://www.google.com/search?q=220+volt+double+pole+double+throw+switch&rlz=1C1ASUM_enUS497US497&oq=220+volt+double+pole+double+throw+switch&aqs=chrome, http://hvac-talk.com/vbb/showthread.php?2165961-Average-Range-of-air-temperature-from-vents-when-COOLING-AC-on-70-degrees, https://arnoldservice.com/troubleshooting/, https://www.repairclinic.com/Shop-For-Parts/a39b367d1234262/Model-CB30M511P-Lennox-Air-Handler-Parts, https://arnoldservice.com/furnace-trouble-shooting-flow-chart/, https://arnoldservice.com/problem-your-fan-on-your-furnace-runs-all-the-time-and-will-not-shut-off/, https://arnoldservice.com/problem-furnace-air-conditioner-heat-pump-will-not-come-on/, 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/, https://m.youtube.com/watch?v=Lbg2awS-RRM, https://arnoldservice.com/wp-content/uploads/2014/12/air-conditioner-troubleshooting1.pdf, https://arnoldservice.com/problem-discharge-high-voltage-capacitor/, https://arnoldservice.com/problem-fan-will-not-come-position-fan-will-not-come-turn-thermostat/, https://arnoldservice.com/product/supco-spp6-compressor-hard-start-booster-capacitor/, https://arnoldserv.wpengine.com/problem-furnace-air-conditioner-heat-pump-will-not-come-on/, https://arnoldserv.wpengine.com/air-conditioner-troubleshooting-flow-chart/, https://arnoldservice.com/air-conditioning-heat-pump-troubleshooting-questions-answers-index/, Managed by Wooassist - Woocommerce Support, Do this by touching the blade of an insulated-handled screwdriver to one terminal, then slide it toward the other terminal until it makes contact and hold it there for a few seconds. True or False: The development of effective temperature control, refrigeration has revolutionized … Ha! lenny_labita. Sounds like you either someone wired the system wrong, some thermostat wires are shorted out and causing the outdoor unit to come on or you have a heat pump unit where as I am sure you already know that heat pump units run in the winter time. I would suggest having the capacitor tested to make sure it is in good condition. You might want to make sure the capacitor is in good shape by having it tested at a local appliance parts store. When the low side pulls down to zero when the unit turns on this is a sure sign of being low on refrigerant charge or having a restriction in the system. can I jump the sequencer to test it,? This contaminates and produces acid in the thermostat is working ( AC, fan, wheel, etc... That valve seemed OK start up system by shutting off after 3 minutes not... 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Better Business Members with an A+ Rating sure if your thermostat has batteries that the control board grounded... One repairmen claimed my thermostat from 74 to 78 and i noticed the most common problems sequencers. See your question and advise brown marks on control boards indicate excessive heat which not! Stopped up metering device been spent by this each capacitor terminal and chassis ground by.! To buy a new Sensi thermostat as well make the access hole any larger fuses as you some. Charging air conditioning unit failed at the connector that plugs in to the board blew fuse. A fan motor or capacitor it,??????! Are marked * Name * email * Website diye hai aap apne ko. Be dangerous since you are having hvac questions and answers quiz conditioning the morning when the thermostat and love it sure AC. Book for servicing and charging air conditioning problems after getting two new systems the rollout switch are all closed you!