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Old 02-09-2010, 05:22 PM   #1
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New t-stat problem


Hello,


I have done some poking around, especially on this site and I've learned I bought the wrong t-stat. I had a White-Rodgers (item # 1F58-72) analog , 2-stage heat & 1 cool t-stat. I bought a Ace Hardware ATX1500 Electronic Heating & Cooling t-stat. I have seven wires (G, Y, W2, R, E = brown, O, X= black) and four matching ports to fill. I hooked G, Y, W2 and R to the matching ports. W2 went to W and R went to RH, there is a jumper on the RH to a RC on the new stat. The O, E and X wires are not hooked to anything. I have heat when I turn the stat to "on" and when the house reaches my set temp, the heat stops and the fan just keeps blowing. When in "auto" I get nothing at all. Obviously I have the wrong stat, but is there anything I can do to make this work? Anyone have any recommended t-stats if not? I really appreciate any advice I get. Thanks..


Last edited by longhorncowboy1; 02-10-2010 at 01:09 AM.
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Old 02-09-2010, 06:59 PM   #2
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New t-stat problem


Sounds like you got the wrong thermostat.

You need a thermostat for a heat pump with aux heat.

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Old 02-09-2010, 11:18 PM   #3
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New t-stat problem


Really? Well its doing the same exact thing the old one was, its not shutting off when it reaches the set temp. The heat shuts off, but the fan just keeps blowing. Thanks man.
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Old 02-10-2010, 12:56 AM   #4
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New t-stat problem


You need a different stat. (Or keep the old stat and fix your broken fan relay if that is the problem)

Your new stat does not have a reversing valve (O) terminal which must be energized to set the reversing valve in your heat pump in the cooling mode.
(New stat won't cool)

I recommend a Honeywell RTH7500 or a RTH7600.

R & Rh = 24 volt power
G = fan
Y = compressor
O = reversing valve
W = heat strip (Aux heat)
E = heat strip (without compressor)
X = common (C on the RTH7500 or RTH7600)

Does the fan turn off with the stat removed?
If it does not you have a bad sequencer, fan relay or circuit board in your air handler. (Though removing the control wiring at the air handler would also remove a short in your stat wire as a possible culprit).

Last edited by Houston204; 02-10-2010 at 01:03 AM.
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Old 02-10-2010, 01:09 AM   #5
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New t-stat problem


Quote:
Originally Posted by Houston204 View Post
You need a different stat. (Or keep the old stat and fix your broken fan relay if that is the problem)

Your new stat does not have a reversing valve (O) terminal which must be energized to set the reversing valve in your heat pump in the cooling mode.
(New stat won't cool)

I recommend a Honeywell RTH7500 or a RTH7600.

R & Rh = 24 volt power
G = fan
Y = compressor
O = reversing valve
W = heat strip (Aux heat)
E = heat strip (without compressor)
X = common (C on the RTH7500 or RTH7600)

Does the fan turn off with the stat removed?
If it does not you have a bad sequencer, fan relay or circuit board in your air handler. (Though removing the control wiring at the air handler would also remove a short in your stat wire as a possible culprit).
Thanks for the reply. Yes, it turns off when I remove the new stat. I also edited my original post, a tad more info. Thanks.
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Old 02-10-2010, 06:13 AM   #6
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New t-stat problem


Quote:
Originally Posted by longhorncowboy1 View Post
Really? Well its doing the same exact thing the old one was, its not shutting off when it reaches the set temp. The heat shuts off, but the fan just keeps blowing. Thanks man.
When the heat comes on. Is it the heat pump that is running, or the aux heat that is coming on and not the heat pump?

Could be the fan is running because the stat(old stat) is still calling for heat, but the heat pump(outdoor unit) is not running.

And you will need to either use the old stat. or go and get a heat pump stat.

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