Make sure that your room temperature is lower than your desired final heating temperature (or higher than your cooling temperature). Next check your wires to the thermostat. Some thermostats have screw terminals; others you push the wire into place after holding open a "lever".
A few months ago, we found that a few of the conductor wires had broken behind the thermostat. On stripping the insulation from the unbroken section of those wires and reconnecting them to the thermostat, it worked fine. There are 4-5 wires behind the thermostat, the wires that control the relays to turn on and off the heating and cooling are different from the power wires.
Next check your system. Change the filter and make sure that the door over the filter is closed. If it isn't seated, you may get a fail-safe over-riding the controls. Some newer systems will have LEDs that give trouble codes. Refer to your manual if you see any lights/code numbers. You also should check the wiring at the furnace/heat pump/AC unit. Another possibility is that the control board for the unit is damaged. (This also happened to us - a close lightning strike caused a surge that destroyed a portion of the circuit board. Your unit should have a trouble-shooting section that tells how to test the system by bypassing certain jumpers.) If the problem is at the board, call a repair person. They'll probably have the correct part on hand if you give them the make/model when you schedule the service call.
Please add a comment with information about your heating and cooling system hardware and any trouble-shooting lights, if present, for additional assistance.
I hope this helps.
May 18, 2013 |
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