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Originally Posted by yanks21 Yep That one! So, with the switch in any "on" position, I should get a "0"

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Old 07-30-2013, 07:53 AM
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Quote:
Originally Posted by yanks21 View Post
Yep That one!
So, with the switch in any "on" position, I should get a "0" volt reading across the black and red terminals if the thermostat is burnt out?

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Old 07-30-2013, 09:29 AM
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So, with the switch in any "on" position, I should get a "0" volt reading across the black and red terminals if the thermostat is burnt out?
No.
I am assuming that there are only those two wires going to the thermostat.

If you get 0 volts across it when set to mid scale it is OK, re: the contacts are closed and it is trying to turn the compressor on.
The next step is important because you have to know if the thermostat is getting the 120 volts.
Now
If you set the thermostat to off (the contacts open) and you should see 120 volts. If not then the adaptive defrost board is not giving voltage to the thermostat and is bad.

You can also check the thermostat using resistance.
Unplug the unit and one wire to the thermostat and then measure across the thermostat contacts/connections.
Should be 0 ohms mid scale at room temperature.
Should be infinite ohms at off.
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Old 07-31-2013, 12:22 PM
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Ok.
Yes. Only 2 connections and a ground.
I have: 160v at off. Infinite ohms
0 at mid range and 0 ohms.
Shouldn't the coil start to frost up?
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Old 08-07-2013, 05:05 AM
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Sorry for not responding sooner but I was out at the lake.

Your thermostat looks OK.
Though I do not know why you measure 160 volts as house voltage is 120 volts.
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Old 08-07-2013, 05:48 AM
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Good for you! No problem, I was out doing the same. Great weather here for it, just a touch on the chilly side.

Ok, I will recheck the voltage, but if the thermostat is ok, then is the reason the coils are not getting cold the board? It is giving the thermostat voltage, but is there another way to check it?
I am trying not to order parts that I don't need. Any thing else that I need to look at?
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Old 08-07-2013, 06:57 AM
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Ok, I will recheck the voltage, but if the thermostat is ok, then is the reason the coils are not getting cold the board? It is giving the thermostat voltage, but is there another way to check it?
You did check it by two ways by using voltage and resistance
Yes. Only 2 connections and a ground.
I have: 160v at off. Infinite ohms

This tell you that when the thermostat switch is open/off/infinite ohms it has voltage across it which it should have.
0 at mid range and 0 ohms.
Also when the thermostat closes the resistance drops to 0 and the voltage also drops to zero.

Shouldn't the coil start to frost up?
Yes the compressor and it's fan should turn on.
But this voltage must also feed through the adaptive defrost board and it does not look like it is doing this so odds are very high that the board is toast.

I am trying not to order parts that I don't need. Any thing else that I need to look at?
No I understand but the circuit only has 3 components to it.
The thermostat which you have checked and it seems to be working.
The compressor and it's fan (they are wired in parallel). It would be very, very unusual that both of them would go bad at the same time.
So all that is left is the adaptive defrost board.
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Old 08-07-2013, 07:08 AM
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OK. Board it is! I will get to work on it and let you know.
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