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PCB ERROR CODES
The water heater is self diagnostic for safety and convenience when troubleshooting.
If there is a problem with the installation or the unit, it will display a numerical error code on the
remote controller or blink the LED on the PCB. Consult the following chart for cause for each
error code.
When remote controller is not installed When remote controller is installed
The PCB is located at the bottom left-hand side of the cabinet and the error codes can be read
from the LED on the PCB or the Remote Control Temperature Display if fitted.
Error Codes
On the PCB or Temperature Remote Controllers
The LED on the PCB
Error Code on Remote
Controller
Symptom
Burning LED:1 Time Blink
03
Incorrect Dipswitch Setting ( Gas )
70
Proportional valve / computer
Burning LED:2 Times Blink
31
Output Thermistor
32
Inlet Thermistor
39
Air-fuel Ratio Rod Failure
Burning LED:3 Times Blink
11
Ignition Failure
12
Flame Loss
51
Abnormal Main Gas valve or
Gas solenoid Valve
72
False Flame Detection
99
Imperfect combustion
Burning LED:4 Times Blink
61
Abnormal Outside Pump
Burning LED:5 Times Blink
10
Warning for 991 Error Setting
―
74
Remote controller
(
MC100-AU3
)
75
Remote controller
(SC100, FC100W-AU3)
The LED on the PCB will be blink
The error code will be displayed on the
remote controller.
PRIORITY
BURNER ON
ON/OFF
PRIORITY
H O T
COOL
MADE IN JAPAN
Main
