Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 773

Error Code Meaning of error code and detection method
Thermal relay (51C) worked
Abnormal if 51C is open.
UA
(4101)
Over heat protection (over-load opera-
tion protection/abnormal fan)
Abnormal if pipe thermistor detects the
Ud
value that exceeds set value during com-
(1504)
pressor operation.
P71-P140 70:
• • •
Abnormal High pressure
This error is detected (4.14MPa) from 63H
action within 20 seconds of compressor
starting in the first heating mode after
power on.
63H: high-pressure switch
UE
(1302)
Case
1 Ball valve and stop valve are
closed during operation.
2 Abnormal compressor
3 Abnormal power supply volt-
age
4 Short interruption.
1 In cooling mode: defective
outdoor fan (fan motor) or
short cycle of air path
2 Defective thermistor
3 Defective outdoor controller
board
1 Gas pipe side ball valve and
liquid pipe side stop valve are
shut during operation.
2 Disconnection or contact failure
of 63H
3 Defective outdoor controller board
4 Power supply reset is detected
while indoor filter clogs and
overload heating operation.
5 Defective outdoor controller
board
6 Defective action of linear
expansion valve
Resolución de averías
Judgment and action
1 Open ball valve and stop valve.
2 Check or replace compressor.
Refer to 5-2.
3 ,4 Check power supply voltage.
1 Check outdoor fan (fan motor)
Refer to 10-6.
24 Put the power off and operate again to
check if U4 is displayed.
If U4 is displayed, follow the U4 process-
ing direction.
1 Open ball valve and stop valve.
23 Put the power off, and operate again to
check if F5 is displayed.
If F5 is displayed, follow the F5 processing
direction.
4 Check indoor filter.
5 Replace outdoor controller board.
6 Check linear expansion valve.
Refer to 10-6.
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