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. It looked like the blower kicking in was stealing enough of the pilot flame away from the strike heat sensing plate to cause it to cut in and out. Problem 3. Thank you in advance for any suggestion. Here in Louisville, KY. HVAC contractors are required to do a heat loss, heat gain calculation on all homes before being allowed to get a permit to do the installation. My daughter just called to tell me that after she turned on the furnace she smelled something coming from the vents. Here in Louisville, KY all outdoor units must have a disconnect box so a service person or homeowner can easily disconnect the power to the outdoor unit. A weak capacitor will also cause a fan motor to stop. I live in Southwest Missouri and for the most part our winters are fairly mild. Thanks so much for asking this great question. Or could it be bad wiring? Steve Arnold. Please send me your furnace’s product number if you would like for me to look up parts. hey I have a ruud heat pump with auxiliary heat strips. The gauges will show whether the unit is low on charge, has a bad valve and whether or not the compressor is working properly. 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. The AC is a Lennox 5kw Elite Serier CB30M Air Handler with model number CB30M-21/26-4P, Hi Robert! If you aren’t getting 24 volts between these two terminals then you might have a thermostat problem or a thermostat wire problem. I remember reading somewhere on your site about lights dimming on A/C start-up. If the blower motor does not start then you have a thermostat wire problem. The contractor wants to eliminate the outside electrical box. You must sign in or sign up to start the quiz. the Tech guy gave me the old ones and told me not to touch the prongs. By clicking on a question, it will take you to a webpage discussing the question along with detailed answers. I was told that the control board just needed to be replaced. 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. Hi Ms. Marino! You should be getting 24 volts AC between these two terminals (R&C) when the furnace power switch is turned on and the blower door safety switch is depressed. Steve. Steve. I have seen other vibration noises on Goodman units that are caused by having loose heat exchanger mounting brackets. Steve. I turned off power to my heat pump and set themostat to call for cool and the fuse held and the contactor kicked in. If the air coming out of the vents is not cool I would suggest hooking up gauges to the unit and see if the compressor is pumping or not. Replace? Could I go ahead and use the gas valve without the flex hose or should I scrounge the internet for my original gas valve? Check to see if the blower wheel spins freely. Most people do not abide by this, but if you want to make sure you do not damage your compressor it would be a good idea to wait the 3 hours. Hi Mr. Thorn! I have a AC overhaul being done at my house today – not there so the repair guy relayed a message to my daughter. Many of the compressors have heaters in them, either external or internal that boil the liquid refrigerant off when power is restored. You should be getting 24 to 28 volts AC between the R and C (com) terminals on the control board. Sorry to hear that your home was hit by lighting! does it even pass 24 volts to the contactor,?? Unless I am wrong I would also think my furnace would shut down of there is no flame but it continues blowing cold air. Hi Mike! My a/c is not blowing cold air, it is blowing room temperature air (so not hot), but definitely not cooling down the house. I was really hoping it was the float valve given there is some water in the pan but that valve seemed OK. Please make sure all the safety controls are closed like the pressure switch and limit. Our Carrier parts program shows that this furnace has a blower motor part number: HC37TQ113 which is only a 1/5 horsepower motor. When the tank is full the HVAC tech should take the reclaimed refrigerant tank to a refrigerant reclaiming facility where they reclaim and process the refrigerant to be used again. Maybe one of the relays inside the thermostat are arcing and causing the high battery draw. 4. All of them told me basically that my problem was a direct result of this blower motor install years earlier. Hvac 3rd visit different tech.The loud rattle noise was noticable tech determined it was the gas line. Steve, I have a hot water coil on my return side of my air handler unit that I use when burning wood. Even if the control board is bad you should still be getting 24 volts AC between R and C and you should be getting power to your thermostat. Any advise what to do next? I have a two story 2450 SQFT home and this only happens when it gets really hot outside. I would check with the manufacturer before wiring up directly to 120 volts AC. Steve. Or would you suspect something else? We have a troubleshooting flow chart that I hope will help you out on the following page: https://arnoldservice.com/furnace-trouble-shooting-flow-chart/ I hope you can easily find and fix the problem. You should have 24 to 28 volts AC between the two wires. We have processed over 25,000 Successful PayPal Orders! Any suggestions? My outside compressor fan gets hung up every once in awhile after being away from my home for a few weeks. On the HVAC side (Control Board and Transformer, it has the following wires connecting to the wire going into the house: *There is a G wire, however it is not hooked up to anything on the outside unit and the control board has no G terminal. On many furnaces the transformer is connected directly to the C (com) and R terminals on the control board. I hope you can find an easy solution to the noise problem. 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. Like I stated, wires are all good no cuts, no breaks. Hi Jerry! I hope this helps you out. 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). Hopefully you have a wiring diagram attached to the furnace blower door or somewhere on the furnace. I can hear The compressor running one minute and then it just shuts off. I would suggest that you call your HVAC contractor back out and have them find out where the problem is and fix it. Had this problem for 6 years. I would make sure you have a filter installed that is not too restrictive. Please make sure if your thermostat has batteries that the batteries are good. Steve. Out of 10 vents total in my house only 3 blow out cool air. Hi Keith! I hope that I have helped answer your question. We bought a house last August and the air conditioning was working fine, though the unit is about 10 years old. Appreciate the quick response too! 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! It would not be good to run the outdoor unit if you are out of or low on refrigerant. Hope you have a nice weekend! Lightly touch the blower motor to see if it is hot. Use our HVAC practice tests to study for becoming an becoming an HVAC technician. The level of the water should no be higher than the center of the T otherwise the switch activates and shuts down your AC. Hope you have a great day! You could also try disconnecting the Y wire from the thermostat and see if the unit outside stills runs. I have seen weak transformers, weak batteries in a thermostat and shorted thermostat wires cause this problem. After some research I noticed the most common problems were sequencers, control board, and thermostats. 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. You will know pretty soon if the vent piping is not adequate because the furnace will stop working. I am sorry, but I do not know the specifications on the gas valve you purchased. We can’t go below 78 or it seems to blow not hot air but not cold either. The duct work inspected by two companies which both said it was fine. Hi Jennifer! The Honeywell shows heat on all the time. If you aren’t getting 24 volts between G and C then you probably have a thermostat or a thermostat wire problem. No change in cycle. On a heat pump you should have at least 6 wires coming to the thermostat with these colors and functions being the rule of thumb: (1) R (red) hot wire coming from the hot side of the low voltage transformer. When I was doing service I would tell myself, “if the power is going into the control board or other control and not coming out then the control board or other control is the problem”. Now I don’t get any heat at all just seems to be the blower blowing cool air. Thanks you so much for asking this question! Compressor getting tight. The coating of residue on the thermal-couple bulb was keeping it from putting out the required micro-volts to keep the main valve open . I hope you can easily find and fix the problem. 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