Question about Mitsubishi PK18FK/FL Air Conditioner

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Mitsubishi air conditiner

I have a conditioner model MUH18RV It's scince 7 years ' a week ago the ac power turn down when the compressor turn on . The power turn off in the cold and heat modes and not at the fan mode . My dealer told me that i have to replace a new compressor. So i have to check my dealer anamnese . Htank a lot Omarih

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Posted on Sep 29, 2007


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1 Answer

Mitsubishi ac keeps on turning itself off

If the compressor overheats, the clixon circuit will shut off the power to the motor to prevent damage. Then when it cools it will close the circuit and the compressor will again run to only shut down again.
The suction line going to the compressor should be cold - the cold gas returning to unit cools the hermetically sealed motor. If that line is hot you may be low on refrigerant.

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Sounds like you have a bad compressor, something is either shorted out, or drawing too much power causing your breaker to trip.

Is this a window unit, or a ductless unit?

I’m happy to assist further over the phone at

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Here is a tip about troubleshooting your air conditioner...
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1 Answer

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2 Answers

My compressor will not start.

There are a few more things to try, in the control unit of the AC there is Cold Control/Freeze Switch. Take down the control unit (inside unit, remove inner shroud) and remove the cover, The freeze control is plugged into the blue plug on the board. Remove the plug and install a jumper wire in its place. Does the compressor come on? If so, you have a bad freeze control. If not, then we need to check and see if your AC power module is sending power to the Compressor. Check power across the relay in the control unit, Black to Blue. If the blue wire is hot, then you need to go upstairs to the top of the compressor and check the thermal overload. If the blue wire is not hot, the comfort control center may not be sending a signal to turn the compressor on. If it is not, do a reset of the CCC. For a five button system, turn the tstat off and hold down the Mode and Zone buttons simultaneously. While holding them down, turn the CCC on and hold the buttons until FF appears on the screen. Release the buttons and try the AC.
Four button reset -
Depress MODE switch to activate annunciator light.
Simultaneously depress the bottom two buttons
(temperature UP and DOWN) and hold.
While holding these buttons down, depress the
MODE button once and release.
Release the two buttons previously held down.
Depress the MODE button once again.
At this time the light should extinguish, and the mode
should register “OFF”. If not, repeat Steps 2 through
Retest system ensuring that all functions are present
and operational.

Hope this helps,


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