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Check Code
Abnormal point and detection method
Pipe temperature
Abnormal if the following conditions are
detected for continuously 3 minutes after
compressor starts operating for 10 minutes.
1. Cooling mode
T
TH7 [ 2: and
63HS−
TH3−TH7 [ 4: or T
TH32−TH6 [ 0: and
Compressor operation frequency is 61Hz or more.
2. Heating mode
T
−TH32 [ 2: and
63HS
P8
TH6−TH32 [ 1: and
TH7−TH3 [ 1: and
Compressor operation frequency is 61Hz or more.
T
: Condensing temperature of pres-
63HS
sure sensor (63HS)
Thermistor
TH3: Liquid temperature
TH32: Inlet water temperature
TH6: Plate HEX Liquid temperature
TH7: Ambient temperature
Abnormal pressure of pressure sensor
(63HS)
Abnormal if pressure sensor (63HS) detects
0.1 MPa or less.
UE
Detection is inoperative for 3 minutes after
compressor starting and 3 minutes after
and during defrosting.
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)
PE
During compressor operation
TH32 < −10:
3. Defrosting mode
During compressor operation
TH32 < 0:
Thermistor
TH32: Inlet water temperature
OCH605A
1 Leakage or shortage of
refrigerant
2 Malfunction of linear expansion
valve
−TH3 < 0: and
3 Refrigerant circuit is clogged
63HS
with foreign objects.
Note: Clogging occurs in the
parts which become below
freezing point when water
enters in refrigerant circuit.
4 Disconnection of thermistor
holder.
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 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 refrig-
erant
Case
1 Check intake superheat.
Check leakage of refrigerant.
2 Check linear expansion valve.
3 After recovering refrigerant, remove water
from entire refrigerant circuit under vacuum
more than 1 hour.
4 Check temperature display on outdoor
controller circuit board.
Temperature display is indicated by setting
SW2 of outdoor controller circuit board.
Check the holder of thermistor.
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 "8-7. OUTDOOR
UNIT OPERATION MONITOR FUNCTION".)
3 Replace outdoor controller circuit board.
12 Check water piping.
3 Check water pump.
4 Check intake superheat.
Check leakage of refrigerant.
22
Judgment and action
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