wanting to verify diagnosis before ordering

Question

wanting to verify diagnosis before ordering

Hello Norcold guy,
I am looking at a replacement board I believe i have identified the board on your page already and I want to be sure of my diagnosis before I proceed with the order.

The symptoms are:
skips running on 120vac and goes right to running on LP gas
runs fine on LP and cools well as long as i turn the gas on (so i ruled out thermistor) , otherwise it goes in to the red light mode.

I have checked:
Fuses, breakers, and GFI.
with the multimeter, I have verified approx 56 ohms at the ac heat element
I also checked and I have 120vac at both sides of the glass fuse.
I have 12vdc at the blade fuse
I THINK for whatever reason it is not detecting that there is 120vac at the optical board. I suspect that there is a problem somewhere in the control board where it would send a signal to run on shore power Without digging deeper to verify for sure that is the case, I wouldn't want to just start replacing parts. If you have any suggestions on how I can track the signal that it would use to detect that it had adequate voltage to run on AC power to verify this please let me know.

Thanks, Josh

Status: Open Jul 17, 2019 - 07:25 AM

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Answer

Oct 02, 2020 - 10:31 AM

I would start by replacing the power board itself since we know that your AC heater is working and that your glass fuse is good. It should be showing a fault and it's not. Sounds to be a bad Norcold 628661.

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