Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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I have a Mitsubishi Mr Slim PK36FK3 and i get error 8 on the codes. I have cleaned the filters and checked to see there is nothing blocking the condenser fans. The fuses do not blow and the breaker does not trip. The unit stops and the green power light flashes with error P8. I can turn it off and on again and it will run for a while. Then the same error messages comes up. What is the problem????

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Hi

There are many things that can trigger that code. The most likely is a power problem...ie. Outage. Reset, and Recycle the power off and on and it take off and run.
Other things to check are:
1 Wrong wiring of Indoor/Outdoor connection
2 Reverse Phase
3 Protection Device operated
4 damaged Outdoor coil thermistor
5 loss of charge

The most likely of these is number 5 .. In cold weather you can be just a tad low and when it gets REALLY cold then the loss of charge switch shuts you down. If you are below -10 F then it can do that even if you are fully charged.
Please check the bellow links and visit the forum to get an idea regarding your query…

http://hvac-talk.com/vbb/showthread.php?t=53149

Let us know if you have something more to know else accept the suggestion.
Thank You for contacting Fixya.com

Posted on Aug 04, 2010

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that is an error code.

count how many blinks after a pause and that would be the error code.

could be 4 , 5, 7, or 9.

you could reset it by un plugging or removing power for ten minutes and try it again.

if the problem would re-occur, then there is something wrong with the unit.

as it runs, observe everything and keep me posted. see if the fn outside is running, if the filter is clean, or if the compressor is running, etc.

tnx 4 using fixya,

drcool

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