Honeywell TH9421 Settings for Heat Pump


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Old 01-11-15, 10:09 PM
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Honeywell TH9421 Settings for Heat Pump

I am so hoping for some help on this forum with my Honeywell thermostat, TH9421. Last winter I ran out of propane because I could no longer afford the hefty fill ups required by my gas company. So I attempted to change my thermostat from a two zone heat pump/gas unit to an all electric unit. I looked at the settings that I found in a manual from Honeywell but am not too versed in the terminology. Still all seemed to go fine until the temps dropped to around 25 degrees or so outside (we live in Virginia). I am trying to find the settings for all electric, heat pump with a/c for the Honeywell TH9421 (bypass propane altogether). I've been in the settings area where you hold down the two buttons at the same time on numerous occasions. Gone through the settings in the manual, but still when it gets really cold outside, the temps in the house start dropping. It's just too cold (50's) in the house for my kids and I (a single mom). We have a three story home, two levels and a basement. The main level and the basement are on the heat pump/gas unit and we have a separate unit in the attic for the third level (we hang out there when it gets too cold). It would be nice to hang out together in the main living area instead of hiding in our rooms. The last couple of days have been pretty cold. Thanks, in advance for any help.

So, for example, what should these numbers be? And how is a heat pump different from conventional?

0172
0174
0176
0180
0190
0200
etc.

Tina
 
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Old 01-12-15, 04:53 PM
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TH9421?

Can you recheck that stat model number?
 

Last edited by Houston204; 01-12-15 at 10:39 PM.
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Old 01-12-15, 09:39 PM
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Sure thing, TH9421C1004.

It has five buttons along the bottom and you press buttons 2 and 4 at the same time to get to the settings on this particular model.
 
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Old 01-12-15, 10:38 PM
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Okay, I see that you have the VisionPro IAQ.


The capacity of a heat pump drops as the outdoor temperature drops.
A heat pump will actually switch to cool mode when it enters defrost mode.

172 = 2 (heat pump)
174 = 1 if you have a single speed heat pump. (post the make and model of the outdoor unit for verification)
176 = 0 (no Aux heat)
180 = (shouldn't pop up when set for heat pump)
190 = 0 (with most units except Rheem, Ruud and Weatherking) post the make and model of the outdoor unit for verification.
200 shouldn't appear
 
 

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