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Compressor relay switch

Have a Honeywell Pro 6000 thermostat with a Aquaterm AC60 water heat pump unit connected. Recently the compressor of the heat pump sometime stays running after the heating should stop (set temp reached or thermostat on off). However, only the fan fan switches off. It seems to me that the one relay that controls the compressor is not switching off. Usually there's are two relay click sounds when the heat switches on or off, one for the fan, one for the compressor). Has anyone had similar problems or can confirm that it might be a relay problem of the thermostat? Thanks.

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  • 45 Answers

What temperature is this heat pump being run at? If it is low ambient temp outside this may be running in what is called defrost mode to where the compressor will run without a call for heat. This seems normal to me as long as the setpoint temperature is being reached.

Posted on Jan 01, 2014

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Posted on Jan 02, 2017

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mikadot
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SOURCE: i have a honeywell thermostat t6360.the light

Many thermostats have battery backup as well as the 24 volt ac. Have you replaced the batteries to see if it fixes all of your issues at once?

Posted on Nov 02, 2013

SOURCE: honeywell heating/AC thermostat intermittently going blank yet heat seems to be running okay. What could be the problem?

All you can do is check the battery's and their connection in their base. I have seen this before and ended up replacing the stat. Wait a little while before replacing it. Maybe one of the other guys knows of something I don't. I hope so. Good luck.

Posted on Dec 18, 2013

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