RE: Electronic/Circuit board experts, what causes this?

RE: Electronic/Circuit board experts, what causes this?

Over the last several years I’ve found too many failed circuit boards on Rheem/Ruud (specifically) gas package units. The solder on the back of the 9 or 12 pin molex plug cracks and the solder disappears. I don’t know if it’s overheating and vaporizing or… The cracking makes sense because package units are out in the weather, I’m in Tucson Arizona where the summers are 120° and winters get down into the 20’s on occasion. I’ve made temporary repairs by squeezing the pins with needle nose pliers long enough to get a replacement board. I could solder them but there’s a bit of liability there.

RE: Electronic/Circuit board experts, what causes this?

I’ve also found the same on Goodman furnaces, and Lennox, but it’s always on the back of the molex plug. Which is typically a safety circuit, or limit.

TimBagnall Junior Tech Asked on March 5, 2018 in Residential HVAC.
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6 Answers

This is something called cold joint! It happens when the surface wasn’t clean or didn’t get hot enough on assembly the first time. The cracks usually occur because of temperate fluctuations

Super Tech Answered on March 7, 2018.
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