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14 Troubleshooting Guide
14.1. Error Codes Table
Item code
Display
Tank no water
H96
abnormality
Heater 1 overheat
detection [H1 operation
H91
detection]
Heater 2 overheat
detection [H1 operation
H71
detection]
TH1 disconnected/short
F31
circuit (Tank Top)
TH2 disconnected/short
H72
circuit (Heater Top)
TH3 disconnected/short
F38
circuit (Tank Bottom)
TH4 disconnected/short
H32
circuit ((Heater Bottom)
TH5 (hot water supply
TH) disconnected/short
H34
circuit
TH8 (hot water return
TH) disconnected/short
H45
circuit
TH7 (heating return TH)
disconnected/short
H50
circuit
TH6 (O/D air temp TH)
disconnected/short
H80
circuit
TH9 (hot water supply
sub TH) disconnected/
H89
short circuit
Hot water supply TH
H81
temperature abnormal
Abnormality detection
condition
Confirm tank is empty by empty
boiling detection sequence
When Heater 1 power on,
confirm no power supply to
Heater 1 for continuous 10sec.
When Heater 2 power on,
confirm no power supply to
Heater 1 for continuous 10sec.
AD value is in highest 3 bit OR
lowest 3 bit
AD value is in highest 3 bit OR
lowest 3 bit
AD value is in highest 3 bit OR
lowest 3 bit
AD value is in highest 3 bit OR
lowest 3 bit
AD value is in highest 6 bit OR
lowest 6 bit (9 bit detection)
AD value is in highest 3 bit OR
lowest 3 bit
AD value is in highest 3 bit OR
lowest 3 bit
AD value is in highest 3 bit OR
lowest 3 bit
AD value is in highest 6 bit OR
lowest 6 bit (9 bit detection)
TH5 (hot water TH) converted
temp - TH9 (hot water supply
sub TH) converted temperature
t8k
TH9 (hot water supply sub TH)
converted temp - TH5 (hot
water TH) converted
temperature t8k
Operation when
Detection period
After ON the operation
SW, when heater is
power ON for first time.
When Heater 1 power
on
When Heater 2 power
on
Always (Detection time:
5sec.)
(recovery time: 5sec.)
Always (Detection time:
5sec.)
(recovery time: 5sec.)
Always (Detection time:
5sec.)
(recovery time: 5sec.)
Always (Detection time:
5sec.)
(recovery time: 5sec.)
Stop hot water supply
Always (Detection time:
operation (Close flow
5sec.)
adjust valve to full
(recovery time: 5sec.)
position, stop hot water
Always (Detection time:
5sec.)
(recovery time: 5sec.)
Always (Detection time:
5sec.)
(recovery time: 5sec.)
Normal operation
Always (Detection time:
(Operate as outdoor air
5sec.)
(recovery time: 5sec.)
Stop hot water supply
Always (Detection time:
operation (Close flow
5sec.)
adjust valve to full
(recovery time: 5sec.)
position, stop hot water
Abnormal display
During hot water supply
* Hot water supply flow
(Detection time: 10sec.)
adjust valve operates as
Stop hot water supply
operation (Close flow
During hot water supply
adjust valve to full
(Detection time: 10sec.)
position, stop hot water
28
Cancel condition
abnormal
Total stops
Operate error reset SW
Heater 1 OFF
Operate error reset SW
Heater 2 OFF
Operate error reset SW
Normal operation
AD value return to the
(Heater 1 is OFF)
normal range
Normal operation
AD value return to the
(Heater 1 is OFF)
normal range
AD value return to the
Normal operation
normal range
Normal operation
AD value return to the
(Heater 2 is OFF)
normal range
AD value return to the
normal range
supply pump).
AD value return to the
Normal operation
normal range
AD value return to the
Normal operation
normal range
AD value return to the
normal range
temp -15qC)
AD value return to the
normal range
supply pump).
When hot water supply
control end, restore
automatically. Cancel by
operate error reset SW.
normal
Cancel by reset power
Cancel by reset power
* Abnormal is not
cancelled by operate
remote control switch
supply pump)
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