YOu need to have your system checked.
It sound like it is low on freon.
Which means you have a freon leak.
Thank you. But WHY does the Honeywell house thermostat keep the interior temperature always at 78F? I have set it at 60F, but there is always a little bit of heat coming out of the registers, and in the basement, the return air ducts are cool, and the delivery ducts are warm. The heat pump runs (it is approx. 50F here in Montreal),but I cannot tell if the EM coils are also heating. Thank you, from Brian
Awaiting reply to request for clarification. Thank you, Brian
Are you saying the the set temp on the thermostat jumps to 78?
After you have set it to 60?
No, I am saying that I cannot reduce the house temperature from 78F, whether I set the thermostat to 60F (heat mode or AC mode). Warm air is always coming out of the ducts. The heating part of the furnace appears to have a life of its own, since the thermostat appears unable to control it. NOTE: After the electricity being turned off all night, I have just turned the system on again; the heat (at a low temperature) is still being delivered, even with the interior temperature at 69F, and with the Honeywell thermostat set to "heat" to 50F only. I predict the heat will continue rising, very likely to 78F. I note also that the heat pump is NOT working, which means that the auxiliary heating system is on. In brief: the Honeywell thermostat is not functioning as it should. Note: the house and HVAC systems are relatively new, built in 2008. No service technician has been here since 2010. This excessive heating syndrome occurred while we were on vacation. Thank you.
Waiting for reply from M. Oglesby. NOTE: "Set" temperature does not "jump". Heat is still rising (1:52 pm est), no matter what the thermostat is set at. Brian
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Your problem is very possibly a heat sequencer stuck.
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