Now I don’t get any heat at all just seems to be the blower blowing cool air. Thanks again! Thanks Arnold. Thankfully, no fire. Hi Charles! The low voltage transformer on your furnace should be directly connected to the control board through the R and C (com) terminals. When the blower does not come on you will need to tape the blower door safety switch closed so you can test the furnace with the power on. Of course the contractor who did the renovation is not responsive. I would suggest testing all the safety controls, ie limit, pressure switch, rollout switches to make sure they are all staying closed. Most of the time it is caused by being low on charge. I would also suggest that you check for a loose fuse if the furnace is equipped with a fuse. “Warning…never stop the cooling system by shutting off the main power. If this be the case then you will probably need a new fan motor. Was ready to buy a new gas valve but decided to give the whole log set a good cleaning so out it came . The blower won’t come on even if I turn it from auto to on. lenny_labita. I hope you can easily find and fix the problem. Please make sure if your thermostat has batteries that the batteries are good. Steve. I hope you can easily find out what the problem is. If you have a heat pump I would recommend going to emergency heat on the thermostat which should not allow the outdoor unit to come on and you will be using all auxilliary heat for your heat source. Sorry to disappoint you. I hope you have a blessed Memorial Day Weekend! The most common cause most of the time is because the system is low on refrigerant charge. Hello friends ye HVAC part 3 hai iss video 10 questions ke answers diye hai aap apne answers ko right answers se compare kare. I would like to suggest that you turn the power off to the unit and use a mirror and flashlight to inspect the blower wheel to make sure it is clean. This customer had installed a new 3 wire pilot burner, then decided to clean the old 3 wire pilot burner to see if he could get it working. If the motor is not hot then I would suggest that you open the thermostat up, loosen the red and green wires on the thermostat, turn the furnace power back on, and touch the green (G) and red (R) wires together. Send me your unit’s model number if you would like for me to look up your unit’s motor part number. This is normal. If the thermostat isn’t getting 24 volts after the 3 minutes then you might try adjusting the anticipator if equipped. 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. During normal operation it shows 27V AC. Great Question! Whatever it is, it is temperature related. Hi Mike! You will know pretty soon if the vent piping is not adequate because the furnace will stop working. Steve. Heat Transfer Quiz Questions ; Ozone Layer Depletion Quiz ... Condenser Basics Quiz Questions; Boiler Basics Quiz; HVAC Heating Basics Test 1; HVAC Heating Basics Test 2; Cooling Towers Quiz Questions; Cooling Towers Quiz Questions 2; 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. I installed the new capacitor and the compressor hard start booster I received. The model number should be located inside the furnace near the burners. Also make sure the rollout switch are all closed. AC man came out today and talked to my wife, he claims we lose power to the furnace because the outside unit overheats. I am very sorry that I can not give you any advice on this. Many appliance parts stores will test capacitor for free. It does not have to be a huge change, even something as simple as using mapping software to get to the next service call faster is a change that helped improve the work environment. I hope this solves your problem. I have checked when this happens and the outside condenser is never running, only the air handler from 1-4 minutes (longer the hotter it gets). The thermostat, low voltage transformer or a loose wire could be the problem. I think it is because my furnace … If I allow my electric utility company to cycle my home a.c. every 15 mins. 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. I checked both sides the transformer and getting 24V and 240V and getting 24V going to the control board. It will sometimes take 10 minutes or 30 mins or an hour to kick back on. I hope you can easily find and fix the problem. – Sam, Hi Sam! Steve. The blower motor should start. After choosing an answer, make sure you to review the detailed explanation that appears. Steve. Sorry to hear this happened. I would think that 90 would mean a good ignitor. I have a two story 2450 SQFT home and this only happens when it gets really hot outside. The unit will quick/short start (not sure if that is what its called) the outside unit will be running and it kicks off for like a second or 2 and comes right back on. PLAY. All Good. Steve. It sounds like the company that you are having is not doing a good job. Question and answer Show Class HVAC UNIT 12. I hope the tech can easily find and fix the problem with your furnace. Again, on the salt treated lumber I would check with your local HVAC code enforcement to see if this is allowed. I will get 27volts when testing the following with the probes: R and G, R and O, R and Y. Please click here to see the SPP6 compressor hard start booster, Thought you’d be interested. This all started with the flame sensor being replaced. I’ve also replaced the fuse on the furnace board, and it doesn’t make a difference. 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. If your home warranty contractor is using the same Copeland scroll compressor as what came out of your existing unit then I would say this would be A-OK since you are getting the same compressor installed. 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. 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. Steve, I have a 2-story home with 3 and 2 tons A/C units. I’ve checked the breakers, the float valve, and everything seems fine. If I turn the furnace off and then on at the furnace. 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 hope you can get this worked out. I hope you can easily find where the rumble is coming from. Study Flashcards On HVAC Practice Test Questions at I think you hit the nail on the head with the transformer or a loose wire being the problem. between terminals R and C (com) and between terminals Y and C and between terminals G and C. 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