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Mitsubishi MSH12TH heat pump air handler 110v

Electrican wired in 230v to,two air handlers. On a 110v units. Mother boards fryed. I replaced the boards. Only one remote controller was given for two air handlers. system was restarted. It cooled for 20 mins. Then fan cut off and coil started to get frozen. Compressor continued to run. I am going to change the reciver board and get one more remote controller. I think the communition link between the reciver board and fan are not being kept in memorey. Or the fan drops out on over load due to the 230v. If the voltage made it that far before the board got cooked.

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Re: Mitsubishi MSH12TH heat pump air handler 110v

Wireing this type AC with the wrong voltage, will damage more than the circuit boards. I think the installer wil need to be responsible for the damage he created. The factory will also try to get out of the replacement because of the installers lack of know how.

Posted on Oct 20, 2007

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Thermostat : Y G R W and sometimes C
Air handler: Y G R W and C
Outdoor unit: two wires connecting to the contactor ( not heat pump)

Thermostat; Y--------------Y(air handler cooling)------------------one side of contactor, outdoor unit
G-------------G (air handler, fan)
R--------------R (air handler ,hot)
W-------------W (air handler, heat)
C--------------C (air handler, common)------------other side of contactor, outdoor unit

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