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The mcp44 does not turn on. - Cfm MCP44 Window Air Conditioner

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I had the same problem. it was working , then it wasnt.
i troubleshooted the controller and found that a capacitor and 2 zener diode was faulty. making the low voltage circuit non functional.
low voltage circuit is what controls the relays that powers the high voltage parts (pump , fan)
the capacitor is a 155J 400V metallized film capacitor. the biggest one on the controller board.
the zener diodes is a 1N4742A and are the small red clear parts between the bridge rectifier and the plug going to the touch controller.
i replaced mine and im back in business.
it cost me less than 20 bucks to buy 10 of the capacitors and 100 of the diodes.
i hope this helps.

The mcp44 does not turn on. - mcp44-not-turn-5brrjntes4fmf3buyb3jvlhh-4-0.jpg



mcp44-not-turn-5brrjntes4fmf3buyb3jvlhh-4-6.jpg

Posted on Sep 04, 2016

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