Mitsubishi Air
Conditioner Error Codes
Mitsubishi Electric Fault Code Check List Index:
Mitsubishi
Air Conditioning Error Codes
- Mitsubishi Mr Slim P Series (A) Error Codes
- Mitsubishi Mr Slim P Series (K) Error Codes
- Mitsubishi Ecodan Error Codes
- Mitsubishi PWFY Series Error Codes
- Mitsubishi CAHV Error Codes
- Operation Light Flashing
- Troubleshooting
Mr. Slim P-Series ductless heat pumps and air conditioners are compact yet powerful, offering unrivaled energy efficiency and design flexibility. Their advanced technology has been designed and tested to withstand the extremes of the Canadian climate in order to deliver a reliable and proven climate control system that you can trust all year round. With a variety of models to choose from, there’s a P-Series solution for any commercial application.
Check Code
|
Diagnosis of malfunction
|
A0
|
Duplicate address - Lossnay units attached with the same
address - change addresses and reset the units power
|
A2
|
Hardware error of transmission processor (Lossnay) - check
comms wiring, and for possible Lossnay board fault
|
A3
|
Line busy no data could be transmitted for 8 minutes -
check A- M-Net connections (TB7 and TB3)
|
A6
|
Communication error with communication processor - Lossnay
address not transmitted - check M-Net voltage
|
A7
|
No ACK signal - check A- M-Net wiring, range of
transmission wiring exceeded or if faulty A- M-Net converter
|
A8
|
M-Net no response - check A- M-Net wiring, range of
transmission wiring exceeded, faulty A- M-Net converter or if incorrect wire
used for M-Net connection
|
EA
|
Mis-wiring/loose inter-connecting cables. Noise
interference
|
EB
|
Mis-wiring/loose interconnecting cables. Noise
interference. Wrong cable size/spec
|
EC
|
Start-up time over. The unit has failed to initialise
after power up. Noise interference. Wrong cable size/spec
|
ED
|
Serial communication error. Comms error between boards on
outdoor unit caused by M-Net interface board incorrectly fitted
|
EF
|
Non-defined error code. Noise interference - power down
outdoor unit for 30 seconds then switch back on
|
E0
|
Remote controller communication error - check wiring,
connections and comms voltage. Also check Master/Slave settings if multiple
systems are connected
|
E1
|
Remote controller issue - if grouped, check addressing. If
twinned, check wired to master indoor only
|
E2
|
Remote controller issue - if grouped, check addressing. If
twinned, check wired to master indoor only
|
E3
|
Remote controller issue - not transmitting - if grouped,
check addressing. If twinned check wired to master indoor only
|
E4
|
Remote controller issue - not receiving - if grouped,
check addressing. If twinned, check wired to master indoor only
|
E5
|
Remote controller issue - not receiving - if grouped,
check addressing. If twinned, check wired to master indoor only
|
E6
|
Indoor/outdoor communication error, mainly caused by
outdoor unit being powered up before indoor unit. Drain pump being wired into
S1 and S2 causes interference
|
E7
|
Comms fault between I/C and O/C - check for condensate
pump at I/C, reset power to O/C, check 12/24Vdc on S2 and S3 possible I/C
board failure
|
E8
|
Comms failure indoor to outdoor (S2/S3) - check pumps
wired in, check indoor isolator and re-power in the correct sequence i.e.
indoor then outdoor
|
E9
|
Comms failure indoor to outdoor (S2/S3) - check pumps
wired in, check indoor isolator and re-power in correct sequence i.e. indoor
then outdoor
|
FA
|
51CM connector open - check thermal relay for
disconnection or contact failure. Possible defective board
|
F1
|
Reverse phase detection - check power supply, try swapping
2 phases round. Possible defective board
|
F2
|
L3 phase open - check power supply, also check for open
circuit protection devices
|
