Author Topic: My Aux heat keeps coming on 1 thermostat and not the other when it should not be  (Read 3250 times)

Offline shelbyball

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My Aux heat keeps coming on 1 thermostat and not the other when it should not be.
I have a 2 stage Heat Pump system (2 zones)(1 heat pump). Both zones are set at an upper temp of 72 deg. One themostat kicks on and off correctly keeping that zone heated to the correct temp. The other kicks on the aux heat and does not stay caught up. If I turn the (bad zone) system off for a few min. and then turn it back on, the heat comes on for a min and two and then turns the aux heat back on. This happens no matter what the temp in that zone (ex. set 72 and actual room temp ranging from 66-70).
I have:
Thermostats = Honeywell Pro TH6220D
Heat Pump = Goodman 5ton R22 (3 months old)
Damper board = Honeywell HZ322 (1 yr old)

Rest of the system is 5 yrs old

Would appreciate any ideas.

Shelby Ball

Offline Admin

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What kind of AUX. heat do you have?  Electric, Propane?
Has the heating ever worked since the new heat pump was installed?
Are the thermostats new, and was the heat pump replacing an existing 2 stage heat pump?

Turn your working zone thermostat to off, and turn the bad zone back on and see what happens.  It could be wiring, or the thermostat setup.  Hard to say without more information.