Mitsubishi Electric Mr.SLIM PUHZ-RP6VHA, Technical & Service Manual

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32
Error Code Meaning of error code and detection method
Judgment and action
UL
(1300)
Abnormal low pressure (63L worked)
Abnormal if 63L is worked (under-
0.03MPa) during compressor operation.
63L: Low-pressure switch
(RP4~RP6VHA only)
1
Stop valve of outdoor unit is
closed during operation.
2
Disconnection or loose con-
nection of connector (63L) on
outdoor controller board
3
Disconnection or loose con-
nection of 63L
4
Defective outdoor controller
board
5
Leakage or shortage of refrig-
erant
6
Malfunction of linear expansion
valve
1
Check stop valve.
2
~
4
Put the power off and on again to check
if F3 is displayed on restarting.
If F3 is displayed, follow the F3 process-
ing direction.
5
Correct to proper amount of refrigerant.
Refer to P10.
6
Check linear expansion valve.
Refer to P41.
E0
(No display)
Remote controller communication error
(Signal receiving error)
(1) Abnormal if any signal from IC of refrig-
erant address “0” could not be normally
received for three minutes.
(2) Abnormal if sub remote controller could
not receive any signal for two minutes.
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 into trans-
mission line of remote con-
troller.
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.
1
~
3
Diagnose remote controller.
Take actions as follows according to
diagnosis result.
a) When “RC OK” is displayed,
remote controllers have no problem.
Put the power off, and on again to
check. If, “H0” is displayed for four
minutes or more, replace indoor con-
troller 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 a remote controller to main, and the
other to sub.
E3
(No display)
Remote controller communication error
(Transmitting error)
(1) Abnormal if sub remote controller could
not find blank of transmission path for
six seconds.
(2) Abnormal if remote controller could not
finish transmitting 30 times continuous-
ly.
1
Defective communication cir-
cuit of remote controller
2
Noise has entered into trans-
mission line of remote con-
troller.
3
Two remote controllers are set
as "main."
(In case of 2 remote con-
trollers)
E8
(6840)
Indoor/outdoor unit communication
error (Signal receiving error)
(Outdoor unit)
(1) Abnormal if outdoor controller board
could not receive anything normally for
three minutes.
1
Contact failure of indoor/out-
door unit connecting wire
2
Defective communication cir-
cuit of outdoor controller board
3
Defective communication cir-
cuit of indoor controller board
4
Noise has entered into indoor/
outdoor unit connecting wire.
1
Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor or out-
door units.
2
~
4
Put the power off, and on again to check.
Replace indoor controller board or out-
door controller board if abnormality is
displayed again.
Case
UF
(4100)
Compressor overcurrent interruption
(When compressor locked)
Abnormal if overcurrent of DC bus or
compressor is detected within 30 seconds
after compressor starts operating. 1
Stop valve is closed.
2
Decrease of power supply volt-
age
3
Looseness, disconnection or
converse of compressor wiring
connection
4
Defective compressor
5
Defective outdoor power board
1
Open stop valve.
2
Check facility of power supply.
3
Correct the wiring (U•V•W phase) to com-
pressor.
4
Check compressor.
Refer to P39.
5
Replace outdoor power board.
UH
(5300)
Current sensor error
Abnormal if current sensor detects –1.5A to
1.5A during compressor operation.
(This error is ignored in case of test run
mode.)
1
Disconnection of compressor
wiring
2
Defective circuit of current sen-
sor on outdoor power board
1
Correct the wiring (U•V•W phase) to com-
pressor.
2
Replace outdoor power board.
UP
(4210)
Compressor overcurrent interruption
Abnormal if overcurrent DC dc bus or com-
pressor is detected after compressor starts
operating for 30 seconds.
1
Stop valve of outdoor unit is
closed.
2
Decrease of power supply volt-
age
3
Looseness, disconnection or
converse of compressor wiring
connection
4
Defective fan of indoor/outdoor
units
5
Short cycle of indoor/outdoor
units
6
Defective input circuit of out-
door controller board
7
Defective compressor
1
Open stop valve.
2
Check facility of power supply.
3
Correct the wiring (U•V•W phase) to com
pressor.
4
Check indoor/outdoor fan.
5
Solve short cycle.
6
Replace outdoor controller board.
7
Check compressor.
Refer to P39.
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