Takagi T-H2-DV Installation Manual And Owner's Manual page 44

If there is a problem with the installation or the T H2 DV/T H2 OS, it will display a numerical
error code on the 7 seg LED of the computer board or the TM RE30 (if installed) to
communicate the source of the problem.
Error
Code
031 Incorrect dipswitch settings
101 Warning for the "991" error code
111 Ignition failure
121
Loss of flame
311 Output thermistor failure
321 Inlet thermistor failure
331 Mixing thermistor failure
341
Exhaust thermistor failure (Only T H2 DV)
391 Air fuel Ratio Rod Failure
441 Flow Sensor Failure (Only Easy Link system)
510 Abnormal Main Gas Valve
551
Abnormal Gas Solenoid Valve
611 Fan Motor Fault
621 Exhaust fan motor Fault (Only T H2 DV)
631 Abnormal External Pump
Water Control Valve Fault (Flow Adjustment function)
651
(Only Easy Link system)
661 Water Control Valve Fault (Bypass valve function)
701
Computer board Fault
711 Gas Solenoid Valve drive circuit failure
721 False Flame Detection
Miscommunication between T H2 DV/T H2 OS and
741
TM RE30
761 Miscommunication in Easy Link
941
Abnormal exhaust temperature (Only T H2 DV)
991 Imperfect combustion
FAULT ANALYSIS OF ERROR CODES
Malfunction description
44
Page
Troubleshooting
Diagnosis
Check the dipswitch
settings on PCB
Call TAKAGI
Technical Dept.
at 1 888 882 5244
Check gas supply
Call TAKAGI
Technical Dept.
at 1 888 882 5244
Lower the set
temperature
Call TAKAGI
Technical Dept.
at 1 888 882 5244