Getting a P8 code on my MSH18NV - Mitsubishi MSH09TW Air Conditioner

What causes the P8 error code? As we mentioned above, the P8 fault can mean many things when it pops up on your Mitsubishi Electric wall controller. The P8 fault is activated when the indoor coil sensor does not change the temperature for a set amount of time after the compressor is (or should be) switched

P8 denotes a fault related with its power supply regulator board. If you wish to get more details about the error codes to Mitsubishi, check this link. http://electronicshelponline.blogspot.com/
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P8 means Abnormality in outdoor unit.
Check:
1) Wrong wiring of indoor/outdoor
connecting wire
2) Reversed phase
3) Protection device is working
4) Damaged outdoor coil thermistor

Solution:
1) Check the indoor/outdoor connecting wire.
2) Change the connection of electric wiring.
3) Check the protection device.
4) Measure the resistance of the outdoor coil thermistor.
If the resistance is normal, replace the
outdoor controller board

Hope, helpful.

p8 means problem at out door unit google mr. slim p8 fult code describes in more detail

Sounds as though you have a bad motor. Once the motor heats up the winding swell causing the motor to constrict itself. Once this happens a thermal overload switch kicks in shutting the motor down to prevent fire. Hope this helps you Philip. Good luck on your repairs

Dave

8 flash is a pipe temperature error.

See this document for P8 code on Mitsubishi Mr Slim MXZ30TN... It is likely you can get the fix just from following the diagnosis steps 1-7. http://www.digelair.net/pdfs/TECHLIT/MITSUBISHI/MrSlim_P-SERIES_Troubleshooting_TIPS.pdf

The 8 error code just means that the ink absorber is full and needs to be replaced. Power cycling will not help this problem. You need to replace the absorber and reset the counter

http://erkinson.altervista.org/stampanti-canon-codice-errore-lampeggi-led/

P8 error is abnormal pipe temperature indoor. If you are running it on heating P8 error will appear because the disc pressure is too high. It could be overcharged.

I am not familiar with a P8 code nor do I understand where you are seeing this But, go to mrslim.com and look under Customer resources, Library and then input your model number. Select Technical & Services. Product Catagory is Mr. Slim Ductless, Sub Catagory is M-series Multi Split, Current models. Remember you have inside units and one outside unit. You will need to look at each model number to find information on both. Usually Mitsubishi's will have two lights that will blink in patterns to indicate what could be wrong. The P8 code is new for this Diamond Dealer!