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Old 10-26-2020, 10:48 AM   #1
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Rain vs Furnace

Every time it rains, whether Iím driving or sitting still, my furnace wonít fire. The fan purge doesnít even spin.

My question: what would happen if i sprayed the circuit board with WD-40? Would this damage or short out the board? I believe this board attracts moisture and Iíd like to stop the moisture build up.

Thank you in advance.
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Old 10-26-2020, 10:52 AM   #2
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I doubt it's a circuit board--they are not typically affected by humidity. I would check wire connections being tight (unplugging and replugging simple one line slip on connectors) and also look for leaks in the area of the furnace, control board and thermostat.
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Old 10-26-2020, 02:59 PM   #3
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Furnace Fault

WD40 is made from fish oil. It evaporates with time. The propellant is a volatile solvent. Check manufactures specifications. Different oils and solvents may dissolve coatings and components on circuit boards.

There should be no water from outside on the circuit board. If so, clean it up and seal the leaks.

As suggested above, corrosion and vibration are the usual suspects. Since the fan won't spin that narrows it down a little. Maybe Old Biscuit will give detailed trouble shooting instructions. Possibly it is the thermostat or thermostat wire connections.

I wish you good luck and happy trails ahead!
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Old 10-26-2020, 03:07 PM   #4
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DO NOT spray it with WD40.
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Old 10-26-2020, 03:15 PM   #5
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Atwood has an on-going issue with some model circuit boards getting wet
They have a 'relocation' kit that raises circuit board up off bottom of casing

Call Dometic and inquire....800-366-3842
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Old 10-26-2020, 03:52 PM   #6
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Agree on no WD 40. Itís is ok for wire insulation preservation but not contacts or exposed circuits.

However, to test your theory, you can hit the board (and whatever else) with a hair dryer. Set the level to low but as much fan speed as possible. Iíd also check contacts, carefully disassembling them, clean and retighten.

Testing will be the issue - like when it rains?
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Old 11-16-2020, 06:53 PM   #7
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another idea

Quote:
Originally Posted by tk369 View Post
Every time it rains, whether Iím driving or sitting still, my furnace wonít fire. The fan purge doesnít even spin.

My question: what would happen if i sprayed the circuit board with WD-40? Would this damage or short out the board? I believe this board attracts moisture and Iíd like to stop the moisture build up.

Thank you in advance.
I removed the circuit board and found some dirt on the back. the dirt was getting damp and shorting out the board. i could just use a toothbrush to remove the dirt. i sealed some gaps on the back wall.

Now, i am considering using Rustoleum spray-on leak sealer to the back of the board. Just a thin coat would suffice, i believe.

What do my RV friends think?
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