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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 min-
utes.
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
TH6-TH32 [ 1: and
TH7-TH3 [ 1: and
Compressor operation frequency is
P8
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.
Detection is inoperative for 3 minutes after
compressor starting and 3 minutes after
and during defrosting.
UE
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
PE
TH32 < 0:
Thermistor
TH32: Inlet water temperature
OCH562D
1 Leakage or shortage of
refrigerant
2 Malfunction of linear expansion
valve
3 Refrigerant circuit is clogged
-TH3 < 0: and
with foreign objects.
63HS
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 fail-
ure 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
25
Cause
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 thermis-
tor (63HS).
2 Check pressure by microprocessor.
(Pressure sensor/ 63HS) (SW2: Refer
to "8-7.OUTDOOR UNIT OPERATION
MONITOR FUNCTION".)
3 Replace outdoor controller board.
12 Check water piping.
3 Check water pump.
4 Check intake superheat.
Check leakage of refrigerant.
Judgment and action
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