24
PCB ERROR CODES
The water heater has a self diagnostic function 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.
1 2 3 4 5 6 7 8
The LED on the PCB will blink.
When remote controller is not 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.
The LED on the PCB
Error Code on Remote
Controller
Symptom
Burning LED:1 Blink
03
Incorrect Dipswitch Setting ( Gas )
70
Proportional valve / computer
Burning LED:2 Blinks
31
Output Thermistor
32
Inlet Thermistor
39
Air-fuel Ratio Rod Failure
Burning LED:3 Blinks
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 Blinks
61
Abnormal Outside Pump
Burning LED:5 Blinks
10
Warning for 991 Error Setting
74
Remote controller (MAIN)
75
Remote controller (SHOWER, ENSUITE)
Error Codes On the PCB or Temperature Remote Controllers
When remote controller is installed
PRIORITY
BURNER ON
ON/OFF
PRIORITY
MADE IN JAPAN
Main
COOL
H O T
The error code will be displayed on the remote
controller.
