Heating - Mitsubishi Electric Mr.SLIM PUH-P1VGAA Technical & Service Manual

Error Code Meaning of error code and detection method
Inner thermostat (49C) working detector
Abnormal if inner thermostat (49C) works
during compressor operation.
49C: inner thermostat 135I5:
U2 [PU(H)-P5, 6YGA]
(1108)
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.
Open/short circuit of discharging ther-
mistor (TH4)
Abnormal if open (0: or less) or short
U3 (216: or more) is detected during com-
pressor operation.
(5104)
(Detection is inoperative for five minutes of
compressor starting process and for 10
minutes after defrosting.)
Open/short circuit of the liquid pipe
thermistor (TH3) or outdoor Condenser-
Evaporator pipe thermistor (TH6)
Abnormal if open (-39: or less) or short
U4
(5105) (88: or more) is detected during com-
(5107) pressor operation.
(Detection is inoperative for seven minutes
after 10 seconds of compressor starting
and for 10 minutes after defrosting.)
Compressor over current (overload)
breaking
Abnormal if current value exceeds over-
load set value during compressor opera-
U6
tion.
(4101)
P1.6 ·····4.5 P2 ·····5.8
P3 ·····9.0 P4 ·····9.0
P6 ·····17.0
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.
P1.6-P6······70:
Abnormal High pressure (63H worked)
This error is detected (3.24MPa) from 63H
action within 20 seconds of compressor
starting in the first heating mode after
power on.
63H: high-pressure switch
UE
(1302)
1 Over-heated compressor oper-
ation caused by shortage of
refrigerant
2 Defective operation of stop
valve
3 Disconnection or contact failure
of connector (26C/49C) on
outdoor controller board
4 Disconnection or contact failure
of 26C/49C
5 Defective outdoor controller
board
6 Defective action of linear
expansion valve
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
1 Disconnection or contact failure
of connector (TH4) on the
indoor controller board.
2 Defective thermistor
3 Defective outdoor controller
board
1 Disconnection or contact failure
of connector (TH3/TH6) on the
indoor controller board.
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 Abnormal compressor
3 Abnormal power supply voltage
P2.5 ·····6.4 4 Overload operation
P5 ·····15.0
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
Case
1 Check intake super heat.
Check leakage of refrigerant.
Charge refrigerant.
2 Check if stop valve is full open.
3-5 After checking connection, operate again
to check operation.
6 Check linear expansion valve.
Refer to 11-3.
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 11-3.
1 Check contact of connector (TH4) on the
indoor controller board.
Refer to page 49 to 51.
Check breaking of the lead wire for thermistor
(TH4). Refer to page 131 and 132.
2 Check resistance value of thermistor
(Refer to 11-3.), or check temperature by
microcomputer(Mode switch of SW2).
3 Replace outdoor controller board.
1 Check contact of connector (TH3/TH6) on
the indoor controller board.
Refer to page 49 to 51.
Check breaking of the lead wire for thermistor
(TH3/TH6). Refer to page 131 and 132.
2 Check resistance value of thermistor
(Refer to 11-3.), or check temperature by
microcomputer(Mode switch of SW2).
3 Replace outdoor controller board.
1 Open ball valve and stop valve.
2 Check or replace compressor.
Refer to 6-2.
3 Check power supply voltage.
4 Check short cycle.
1 Check outdoor fan (fan motor)
Refer to 11-3.
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 11-3.
40
Judgment and action