Mitsubishi Electric PUHZ-W85VHA, Service Manual, Page: 20 / 45

20
Error Code
Abnormal point and detection method Judgment and action
Case
PE
Inlet water temperature
Abnormal if the following conditions are
detected for continuously 10 seconds.
1. Cooling mode
During compressor operation
TH32 < 3
:
2. Heating mode (exclude defrosting)
During compressor operation
TH32 < -10
:
3. Defrosting mode
During compressor operation
TH32 < 0
:
Thermistor
TH32: Inlet water temperature
1
Reduced water flow
· Clogged filter
· Leak of water
2
Low temperature
· Low-load
· Low temperature inlet water
3 Defective water pump
4 Leakage or shortage of
refrigerant
12
Check water piping.
3 Check water pump.
4 Check intake superheat.
Check leakage of refrigerant.
8-4. HOW TO CHECK THE PARTS
PUHZ-W85VHA
1
2
3
4
5
6
M
Gray
Orange
Red
Yellow
Black
Parts name Check points
Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature of 10
~30 )
TH3: Liquid pipe
temperature
TH4: Discharge
temperature
TH6: Plate Hex liquid
pipe temperature
TH7: Ambient
temperature
TH8: Heatsink
temperature
TH32: Inlet water
temperature
Normal
160k ~410k
4.3k ~9.6k
4.4k ~9.8k
39k ~105k
TH4
TH3
TH6
TH7
TH32
TH8
Abnormal
Open or short
Measure the resistance between the terminals with a tester.
(At the ambient temperature of 20
)
Solenoid valve coil
<Four-way valve>
(21S4)
Compressor
(MC)
Normal
Abnormal
Open or short
Measure the resistance between the terminals with a tester.
(At the ambient temperature of 20
)
Normal
1450±150
Abnormal
Open or short
Solenoid valve coil
<Bypass valve>
(SV)
Refer to the next page. Fan motor (MF1)
2350±170
0.865 ~0.895
Measure the resistance between the terminals with a tester.
(Winding temperature 20
)
Normal Abnormal
Open or short
W
V
U
Linear expansion valve
(LEV-A) (LEV-B)
Disconnect the connector then measure the resistance with a tester.
(Winding temperature 20°C)
Normal
Gray - Black Gray - Red
Gray - Yellow
Gray - Orange
Abnormal
46±3
Ω
Open or short