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25-04-2006, 04:23 AM #1
P8 message on Control Board Mitsubitsh mr Lim
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
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25-04-2006, 06:50 PM #2
Re: P8 message on Control Board Mitsubitsh mr Lim
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...
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25-04-2006, 07:29 PM #3
Re: P8 message on Control Board Mitsubitsh mr Lim
Have a look at this thread http://www.refrigeration-engineer.co...ighlight=mitsi
Last edited by frank; 25-04-2006 at 07:33 PM.
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25-04-2006, 07:53 PM #4
Re: P8 message on Control Board Mitsubitsh mr Lim
is a p8 fault just not an outdoor fault?
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25-04-2006, 08:01 PM #5
Re: P8 message on Control Board Mitsubitsh mr Lim
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
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25-04-2006, 10:13 PM #6
Re: P8 message on Control Board Mitsubitsh mr Lim
A list of Mitsi fault codes is available here:-
http://airconwarehouse.co.uk/Techmanuals.htmBrian - Newton Abbot, Devon, UK
Retired March 2015
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