27
Check 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.
UE
Abnormal pressure of pressure sensor
(63HS)
Abnormal if pressure sensor (63HS) detects
0.1 MPa or less.
Detection is inoperative for 3 minutes after
compressor starting and 3 minutes after
and during defrosting.
1
Disconnection or contact failure
of connector (63HS) on the
outdoor controller circuit board
2
Defective pressure sensor
3
Defective outdoor controller
circuit board
1
Check connection of connector (63HS) on
the outdoor controller circuit board. Check
breaking of the lead wire for thermistor (63HS).
2
Check pressure by microcomputer.
(Pressure sensor/ 63HS) (SW2: Refer to "9-7.
OUTDOOR UNIT OPERATION MONITOR
FUNCTION".)
3
Replace outdoor controller board.
OCH465D
