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Intertherm I have a package unit that has stated dropping out the cond. fan and comp, but contiues to run the blower motor. when I opened panel I noticed that the contactor will pull in and then drop out . this happens every few mins. The unit did this for the 1st time night before last. When I checked it yesterday morning I replaced the contactor and still had same problem. while checking voltages the contactor pulled in and the unit worked fine all day. then last night the problem returned. I opened panel and just placed a finger on the parts of a small board ( part # 6214770 ) and the contactor pulled in and has worked fine for more than an hour now. What could cause this and what can I do to repair?

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Check the board for a cold soldered joint. If you can move the spade that the line connects to it should be re-soldered. A cold soldered joint can give intermittent service because it can make contact at one time then loose contact by even a change in temperature around it.

Posted on May 16, 2008

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