Walk in cooler, Tecumseh compressor AKA9442EXD, R-22.
Customer calls walk in cooler warm compressor hot. I check unit and find the potential relay contacts not opening and further inspection find the relay coil open. I go get new start components, install and the unit is doing the same thing, relay contacts not opening, compressor pulling 16 amps.
Potential relay was crossed to a Mars 19163 per the manufacture.
The comp will only run about 20 seconds before going out on the ext overload. What am I missing? Any help or suggestions appreciated.
Also customers says a day before the cooler had trouble they had a power surge.