Mitsubishi Electric Mr.Slim PUH-P25VGAA Service Manual page 41

Note: E1, E2 and E4 to E7, refer to indoor unit service manual.
Error Code Meaning of error code and detection method
Compressor over current (start-up
locked) breaking
UF
Abnormal if compressor current exceeds
(4100)
1.2 times of overload set value.
Current sensor error
Abnormal if compressor current is not
detected on first compressor start-up after
power supply is put on.
UH
(5300)
Remote controller communication error
(Signal receiving error)
(1) Abnormal if any signal from IC of refrig-
erant address "0" could not normally
received for three minutes.
(2) Abnormal if sub remote controller could
not receive any signal for two minutes.
E0
(No display)
Remote controller communication error
(Transmitting error)
(1) Abnormal if sub remote controller could
not find blank of transmission path for
E3
six seconds.
(No display)
(2) Abnormal if remote controller could not
finish transmitting 30 times continuous-
ly.
Indoor/outdoor unit communication
error (Signal receiving error)
(Outdoor unit)
(1) Abnormal if outdoor controller could not
E8
receive anything normally for three
(6840) minutes.
Indoor/outdoor unit communication
error (Transmitting error)
(Outdoor unit)
(1) Abnormal if "0" receiving is detected 30
times continuously though indoor con-
E9
troller has transmitted "1".
(6841)
(2) Abnormal if outdoor controller could not
find blank of transmission path for
three minutes.
Case
1 Abnormal compressor
2 Clogged indoor filter
3 Open-phase compressor
1 Disconnection or contact fail-
ure of connector (52C) on out-
door controller board
2 Disconnection or contact fail-
ure of coil 52C
3 Defective outdoor controller
board
4 Defective parts of 52C
5 Compressor V-phased wire
does not penetrate through
current detector.
1 Defective communication cir-
cuit of remote controller
2 Defective communication cir-
cuit of indoor controller board
of refrigerant address "0".
3 Noise has entered transmis-
sion wire of remote controller.
4 All remote controllers are set
as "sub" remote controller. In
this case, E4 is displayed at
outdoor LED, and E0 is dis-
played at remote controller.
5 Wiring regulations are not
observed.
•Length of wires
•Number of remote controllers
•Diameter of wires
•Number of indoor units
1 Defective communication cir-
cuit of remote controller.
2 Noise has entered transmis-
sion wire of remote controller.
3 Two or more remote con-
trollers are set as "main."
1 Contact failure of indoor/out-
door unit connecting wire
2 Defective communication cir-
cuit of indoor controller board
3 Defective communication cir-
cuit of indoor controller board
4 Noise has entered indoor/ out-
door unit connecting wire.
1 Defective communication circuit
of outdoor controller
2 Noise has entered power supply.
3 Noise has entered indoor/
outdoor unit connecting wire.
4 Indoor/ outdoor unit connecting
wire has contact failure.
5 Defective communication circuit
between indoor and outdoor
unit on indoor controller board.
41
Judgment and action
1 Check compressor.
Refer to 5-2.
2 Check indoor unit and repair defective.
3 Check connection.
12 Check connection.
3 Replace outdoor controller board.
4 Check 52C.
5 Check wiring.
123 Diagnose remote controller
Dispose as follows according to diagno-
sis result.
a) When "RC OK" is displayed,
Remote controllers have no problem.
Put the power off, and on again to
check. If, "PLEASE WAIT" is displayed
for four minutes or more, replace
indoor controller board.
b) When "RC NG" is displayed,
Replace remote controller.
c) When "RC E3" or "ERC 00-66" is dis-
played, noise may be causing abnor-
mality.
4 Set one of the remote controllers "main", if
outdoor LED is E4 while E0 is displayed at
remote controller.
1 Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor or out-
door units.
234 Put the power off, and on again to
check. Replace indoor controller board
or outdoor controller board if abnormality
is displayed again.
123 Put the power off, and on again to
check. Replace outdoor controller board
if abnormality is displayed again.