Thermostat problem and replacement


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Old 06-26-10, 07:21 AM
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Thermostat problem and replacement

Hi, my house has a Goodman CHT18-60 thermostat that controls heating and cooling. Recently, the thermostat runs into a peculiar problem: it no longer stops AC. If I push the temperature setting lever to a point that the AC starts to run, then the AC keeps running, even when the room where the thermostat is is already cool. I have to pull the lever backwards to stop the AC. Is there any simple solution?

I don't see CHT18-60 in local Home Depot where there are many other brands/types of thermostats. Which brand/model can replace CHT18-60? I read about low voltage, line voltage. Do all thermostats have same standard mounting? In other words, can a replacement thermostat reuse the same screw holes on the wall?

Thank you very much!
 
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Old 06-26-10, 11:21 AM
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Looks like you have a 1 stage heat / 1 stage cool 4 wire stat with R, W, G and 2 terminals.

Many digital stats require a fith wire for C (common). I recommend a honeywell stat that can also sub batteries for this.

Do you have gas heat?

If both stats are horizontal, you will probably be able to use the same screw holes.
 
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Old 06-26-10, 01:45 PM
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Thanks for replying.

Yes, the CHT18-60 is a 1 stage t-stat, with 4 wires, R, W, G, and Y. Not that I know much, I searched the internet to find that it's 1 stage and is low voltage, and I opened it to see 4 wires.

What is "2 terminals"?

I have gas heat.

So any low voltage t-stat would work? I read (again on internet) that there are 24V, 30V, and 38V t-stats, confusing.

Originally Posted by Houston204
Looks like you have a 1 stage heat / 1 stage cool 4 wire stat with R, W, G and 2 terminals.

Many digital stats require a fith wire for C (common). I recommend a honeywell stat that can also sub batteries for this.

Do you have gas heat?

If both stats are horizontal, you will probably be able to use the same screw holes.
 
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Old 06-26-10, 02:19 PM
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R = 24 volt power
G = fan
Y = cool
W = heat

The 2 terminal would have been something to look into further.
They will support 24 volt operation (plus or minus...)
 
 

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