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Abnormal points and detection method
Error Code
Freezing/overheating protection is oper-
ating
Overheating protection <Heating mode>
Abnormal if condensing temperature of
pressure sensor (63HS) detects
Tcond. °C or more and compressor
operation frequency is less than or equal
to 25 Hz. Detection is inoperative during
defrosting.
P6
Tcond
stage-g
-18 -17
Actual tank temperature thermistor
(TH5)
1 The unit is 3-minute resume preven-
tion mode if short/open of thermistor is
detected. Abnormal if the unit does not
reset normally after 3 minutes. (The unit
returns to normal operation, if it has been
reset normally)
2 Constantly detected during cooling,
heating, heating ECO, anti freeze and
P9
hot water operation.
OCH525
1 Overcharge of refrigerant
2 Defective refrigerant circuit (clogs)
3 Malfunction of linear expansion valve
4 Reduced water flow
· Clogged filter
· Leakage of water
5 High temperature
· Over-load
· Inlet water is too warm.
6 Defective water pump
stage-e
stage-f
-15 -14
-12 -11
stage-a stage-b stage-c stage-d stage-e stage-f stage-g
Tcond
SW40/50
63
61
1 Defective thermistor character-
istics
2 Contact failure of TB61 No. 5-6
on PCB of interface unit/Flow
temp. controller
3 Breaking of wire or contact
failure of thermistor wiring
4 Defective PCB of interface
unit/Flow temp. controller
Case
stage-c
stage-d
-9
-8
-6
60
58
56
53
23
Judgment and action
12 Check operating condition of refrigerant
circuit.
3 Check linear expansion valve.
45 Check water piping.
6 Check water pump.
stage-a
stage-b
-5
-3
-2
Ambient temperature
50
1–3 Check resistance value of thermistor.
0:
15.0k"
10:
9.6k"
20:
6.3k"
30:
4.3k"
40:
3.0k"
If you put force on (draw or bend) the lead wire
with measuring resistance value of thermis-
tor, breaking of wire or contact failure can be
detected.
2 Check contact failure of TB61 No.5-6 on
PCB of Interface unit/Flow temp. controller.
Refer to 7. WIRING DIAGRAM.
Turn the power on again and check restart
after inserting connector again.
4 Check actual tank temperature display on
remote controller.
Replace PCB of Interface unit/Flow temp.
controller if there is abnormal difference with
actual tank temperature.
Turn the power off, and on again to operate
after check.
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Table of Contents
Troubleshooting
