John Wood Takagi - 910 - Manual (Page 26)

26
Troubleshooting – Error Codes
The 910 units are self diagnostic for safety and conve-
nience when troubleshooting.
If there is a problem with the installation or the unit, it will
display a numerical error code on the remote controller
(if installed) or on the 7-Seg LED of the central computer
board and section computer board to communicate the
source of the problem.
Consult the following chart for the cause of each error
code.
The top red lamp will flash when the right combustion
section has an error code.
The mid red lamp will flash when the left combustion sec-
tion has an error code.
Upper bank of
DIPswitches
Lower bank of
DIPswitches
7-Seg
LED
Top red
lamp
Mid red
lamp
Remote controller (Optional)
•
•
•
•
•
Error
Code
Malfunction description
031 Dipswitch Setting fault
101 Warning for 991 Error Code
111 Ignition Failure
121 Flame blows out
311 Output Thermistor Failure
321 Inlet Thermistor Failure
331 Mixing Thermistor Failure
391 Air-fuel Ratio Rod Failure
441 Flow Sensor Failure
510 Abnormal Main Gas Valve
551 Abnormal Gas Solenoid Valve
611 Fan Motor Fault
631 Abnormal External Pump
651
Water Control Valve Fault (Flow Adjustment
function)
661 Water Control Valve Fault (Bypass function)
681 Abnormal External Fan motor
701 Computer board Fault
721 False Flame Detection
741
Miscommunication between water heater and
remote controller
761
Miscommunication in Easy-Link OR Multi-unit
system
991 Abnormal burning
Single Unit
The 7-Seg LED displays the 3-digit error codes one digit
at a time. The remote controller (if installed) displays the
whole 3-digit error code at once. When the right and/or left
combustion section has an error code, the red lamp next to
the 7-Seg LED on the central computer board will flash to
indicate which combustion section has the error code. Refer
to the above picture.
Example:
If your unit has the “321” error code (inlet thermistor),
- The 7-Seg LED, will flash the 3-digit error code one digit
at a time. The 7-Seg LED will display “3”...“2”... “1”, and
then repeat the 3 digits.
The remote controller, however, will display “321” on its
screen, in its entirety. •
•