Question about Heating & Cooling
My Simple Comfort 78100 thermostat wont heat above 72 all of the sudden. It's been working fine until today when I noticed the temperature 3 degrees below what I set it. I can't seem to make it go higher. Any suggestions?
Check for a tripped breaker. the fan works on a different breaker. You will almost always find them side by side in the panel.
Posted on Dec 12, 2014
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Posted on Jan 02, 2017
One of two things you can try. Do you own a volt ohm meter? Anytime your unit cycles short like it is doing the control circuit which on this one is 24 volts that engages relays and controls the gas valve to open and close. I am thinking the heat exchanger is getting so hot it is tripping the upper limit which for the most part is around 180 degrees. So next time it turns off take your ohm meter and with the power to the whole unit off. Either turn the breaker off or there is a light switch that is real close to unit turn it off. Undo the two wires to the gas valve and ohm them out. You should have continuity if you get nothing check each limit switch should have a couple. Undo wires to them and check. If you find one that is open more then likely the upper one. They are a safety device that keeps the unit from getting too hot.
There might be another option increase the speed of your fan motor to get the heat out of furnace quicker. Look at the circuit board notice the fan wiring going to it. The Red wire from fan is low speed look to see if it is on HEAT on the board. You should have 4 speeds to pick from you could take the black off of COOL and swap wires and test the unit by doing that. I'm going to put a solution on this so I can come back to it quicker. Even though we a just testing it for now. ken
Posted on Dec 21, 2008
Is this an electric or gass furnace - Eather of these can can have this problem its most recomendable that you call a seviceman .
in the case of electric furnace you may requier a new heat sequencer. And in the case of gass you may requier a new relay.
Posted on Feb 19, 2009
the unit may be drawing the cool air it just released back into itself,plus the air close to the unit may be a little cooler than the air in the rest of the room.
Posted on Mar 19, 2009
Verify 24 volts at the low voltage transformer inside the air handler. If it is OK, jump out the red/green and yellow thermostat wires. If everything comes on, replace the thermostat.
Posted on Jun 08, 2009
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