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BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22515
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I am trouble-shooting a Mitsubishi Mr Slim AC PK18/PU18EK.

Customer Question

I am trouble-shooting a Mitsubishi Mr Slim AC PK18/PU18EK. Unit failed after a lightning strike. Getting P8 code. The compressor runs/cools if manually actuated. Fan runs manually. All voltage s and fuses ok High pressure cutout ok. NO error codes on LEDs. Changed board with no success. Only problem I have found, is that the 12 v control voltage to the outside unit is 1.6 volts when connected and 12 volts open. Tried loading the terminals at the indoor unit with 100K resistor and voltage drops way down.
Submitted: 2 years ago.
Category: HVAC
Expert:  BillyHvac replied 2 years ago.
Hello,
before we get started have you went over this?
copy and paste the below link
http://www.digelair.net/pdfs/TECHLIT/MITSUBISHI/MrSlim_P-SERIES_Troubleshooting_TIPS.pdf

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