Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 770

Resolución de averías
Error Code Meaning of error code and detection method
Abnormal low current or open phase
• An extreme degradation of current value
causes abnormal stop.
• Abnormal if current detected phase (V-
phase) is open phase after first compres-
sor start-up after supplying the power by
three phase power supply model.
• When compressor is operating, compres-
sor is suspended under the following
condition: and when current detector
(CT) detects a current, which is lower
than the detected current specified in the
table below, under the following condi-
tion:
<Condition>
U1
1 For PU/PUH-P71~P100V
Current detector (CT) has detected a
current, which is lower than the detected
current specified in the table below, for
0.7-0.8 second.
2 For PU/PUH-P71 ~ P140Y
Current detector (CT) has detected a
current, which is lower than the detected
current specified in the table below, for
0.4-0.5 second.
Model
P71V
P71Y,P100V,P100Y
P125Y
P140Y
Abnormal shortage of refrigerant
Abnormal if intake super heat exceeds fol-
lowing temperature during heating com-
pressor operation.
U2
70: or more, and indoor pipe <con-
(1501)
denser- evaporator> temperature (TH5) is
35: or less.
770
1 Shortage of refrigerant
2 Abnormal pressure degrada-
tion by pump down operation
3 V-phased open phase of com-
pressor
4 Abnormal compressor
Not abnormal if V is instantly
displayed when the main
power is put off.
Detected current
2.4 A
1.0 A
1.2 A
1.6 A
1 Leakage or shortage of refrig-
erant
2 Defective operation of stop
valve (not full open)
3 Defective thermistor (TH4,
TH5, TH6)
4 Defective outdoor controller
board
5 Defective action of electric
expansion valve
Case
1 Check if refrigerant pressure is not degraded.
2 Check current of compressor operation when
abnormality occurred.
3 Check wiring of compressor.
4 Check or replace compressor.
1 Check leakage of refrigerant.
Charge refrigerant.
2 Check if stop valve is full open.
34 Put the power off and check if U3 or U4 is
displayed when the power is put again.
When U3 or U4 is displayed, refer to
"Judgement and action" for U3 or U4.
6 Check linear expansion valve.
Refer to 10-6
Judgment and action