Pcb Error Code - Takagi GS-20W-AU5 Installation Manual And Owners Manual

17. PCB ERROR CODE

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 error code on the remote con-
troller or blink the LED on the PCB. Consult the following chart for cause for each error code.
When remote controller is not installed
The LED on the PCB will flash.
The PCB is located at the bottom left-hand side of the cabinet and the error codes can be indicated
by flashing of the LED on the PCB or the Remote controller temperature display if it is installed.
Error Codes On the PCB or Temperature Remote Controllers
The LED on the PCB
One flash
Two flashes
Three flashes
Four flashes
Five flashes
Six flashes
Error Code on Remote
Controller
031
701
711
311
321
391
111
121
611
991
510
511
721
741
751
When remote controller is installed
The error code will be displayed on the
remote controller.
Incorrect DIP switch setting
PCB fault
Gas solenoid valve drive circuit failure
Output thermistor
Inlet thermistor
Air-fuel ratio rod failure
Ignition failure
Flame loss
Fan motor failure
Imperfect combustion
Abnormal Main gas solenoid valve
Abnormal Gas solenoid valve
False flame detection
Miscommunication
(MC-110-AU)
Miscommunication
(FC-110-AU/SC-110-AU)
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Symptom