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Old 03-03-2019, 11:25 AM   #1
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Join Date: Feb 2016
Posts: 240
Electronic fridge/ hot water control boards

Hi Folks,
I've repaired a great many "failures" on furnaces and fridge controls and can share a little unknown issue that can have you back up and running without surfing the net and spending money you may not need to.

The back of many boards are not "potted" with either epoxy or silicone. This leaves the solder mask open to the environment. The control circuit can be influenced by condensation and dirt. Any impedance on the circuits can cause all the normal issues we all hear religiously. Some MH have the furnace directly below a bathroom sink or other plumbing. It's not necessarily the water, H2o, itself but the iron partials in the water that create an impedance, resistance, on the circuit. This causes NO light, NO flame detect or the dreaded fan continuously runs faults.

Here is how I fix 9 out of 10 boards to again work like new:
Remove the board after taking a photo of the wire connections.
On the back side, spray a cleaner like Clorox general purpose cleaner.
Scrub the solder mask with a small scrub brush until the solder mask is again shinny.
Turn you oven on the lowest temp and allow to warm the board slightly.
Allow adequate time to dry, 10-15 minutes.
Run a bead of CLEAR silicone down the center of the solder mask side and use a business card or paper board to spread and coat the entire surface but NOT the edge connector.
Remount and install the wiring and test.

Don't be surprised when your appliance starts up and runs perfect.

This may not fix them all but 9-10 is great odds in Vegas!

Hope this helps a great many to save money and repair your GOOD board gone bad.

George and Diane, 2004 Discovery 39S pushed by our Keywest CC w/115 Johnson
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Old 03-03-2019, 01:35 PM   #2
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Thank You !!!

'04 Newmar MADP: 1Kw solar, Silverleaf, '17 Rubicon
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Old 03-03-2019, 02:44 PM   #3
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Sounds like a really good tip! Thank you for it!
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fridge, water

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