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Old 04-19-2013, 03:45 PM   #1
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very low voltage to thermostat?


My A/C recently has had an issue where the whole a/c just shuts off and the thermostat is blank like it has no power.

What I have done is shut all the breakers off in the breaker box and flip them all back on after a few minutes and the a/c worked again for days. There was a night or two I smelled burnt plastic.

EDIT: now my a/c will not run at all. I have the blank thermostat

My thermostat does NOT use batteries. I used the multimeter to test between R and C on the thermostat wiring and show very low voltage like 004 or something. I checked the transformer and it does have 24+ volts looks like 27 or 28.

Does this mean the control board is bad? In case it is usefull the board is HK61EA002. Also there is a part hk61ea003 which I understand should be converting ac to dc for the board, could this be bad/broken? Is there anything else I should do or test? Thanks.


Last edited by bigmac; 04-19-2013 at 04:05 PM.
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Old 04-19-2013, 06:11 PM   #2
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very low voltage to thermostat?


Check r and c at the control board. Any fuses on that board?

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Old 04-19-2013, 07:04 PM   #3
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very low voltage to thermostat?


Sorry I forgot to mention I did check the fuse and it was fine.

I actually had the board out to see if anything looked burnt on the backside which it did not everything looked clean.

I just saw your reply, I reinstalled the board (I had taken pictures to insure the proper connections) and then used the meter to test the R and C on the board and it reads 027 vac just like the transformer. I'm assuming this means the board is okay?

Not sure what to do next.
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Old 04-19-2013, 08:43 PM   #4
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very low voltage to thermostat?


Next step would be to check the thermostat wires for a break.
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Old 04-20-2013, 03:22 AM   #5
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very low voltage to thermostat?


Look if you have a float switch wired to break power to R.
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Old 04-20-2013, 01:13 PM   #6
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very low voltage to thermostat?


Well it is now fixed, thanks for all the help guys I really appreciate it.

I looked for a float switch and what I found is the water pump behind the filter, I tilted it some and it was full of water and then started working and pumping the water out. I'm not sure what the deal is the pump is going bad or something because it didn't run until I tilted it. So now everything is working great
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Old 04-20-2013, 01:16 PM   #7
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very low voltage to thermostat?


It needs cleaned out. Gunk is clinging to the float and preventing it from rising.

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