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View Full Version : P8 message on Control Board Mitsubitsh mr Lim



wanes98
25-04-2006, 04:23 AM
Hello
I am servicing a unit(Mr. Slim) which is a ductlee made by Mitsubitch. The control board (thermostat) displays the code P* does any one what is that
Thanks

chilled2005
25-04-2006, 06:50 PM
hiya i think p8 is a pipe sensor fault, dont hold me to it but im quite sure off the top of my head...its either faulty or not there at all or not sensing the temperatures its looking for e.g. short of gas...

frank
25-04-2006, 07:29 PM
Have a look at this thread http://www.refrigeration-engineer.com/forums/showthread.php?t=3557&highlight=mitsi

thebigcheese
25-04-2006, 07:53 PM
is a p8 fault just not an outdoor fault?

frank
25-04-2006, 08:01 PM
P8 means "Abnormality in Outdoor Unit"

Possible causes

1 Wrong wiring of Indoor/Outdoor connection
2 Reverse Phase
3 Protection Device operated
4 damaged Outdoor coil thermistor

Areas to check

1 Check continuity of the interconnect wiring - look for breaks (I've had it where rats have chewed the wiring before )

2 Check the phase rotation - has any work been done on the unit mains wiring?

3 Has any safety activated? Compressor klixon? LP switch? HP switch, Fan overload? etc.

4 Measure the resistance of the coil sensor

If you are still struggling then give Mitsi Technical a ring 08703000300

Brian_UK
25-04-2006, 10:13 PM
A list of Mitsi fault codes is available here:-
http://airconwarehouse.co.uk/Techmanuals.htm