Takagi T-H2S HVAC System Error Codes

High-Efficiency HVAC System. 14 error codes documented.

Severity breakdown: 4 critical , 10 warning

Error Codes

Code	Description	Severity
101	Combustion Abnormality	Critical
111	Ignition Failure	Critical
121	Flame Failure	Critical
510	Gas Solenoid Valve	Critical
200	Overheating	Warning
207	Bypass Valve Error	Warning
291	Flow Rate Issue	Warning
312	Outlet Temp Sensor	Warning
321	Inlet Temp Sensor	Warning
391	Exhaust Temp Sensor	Warning
610	Fan Motor Fault	Warning
710	PCB Fault	Warning
720	Remote Control Error	Warning
760	Communication Error	Warning

Cross-Reference: Shared Codes with Other Takagi Models

Model	Type	Shared Codes	Unique to That Model
TK-110U	—	14 / 14	—
TK-310U	—	14 / 14	—
T-H3	—	14 / 14	—
T-H3S	—	14 / 14	—
T-H3J	—	14 / 14	—
T-D2U	—	14 / 14	—
T-H3M	—	14 / 14	—
T-K4	—	14 / 14	—
T-M50	—	14 / 14	—
T-M32	—	14 / 14	—
TK-510U	—	14 / 14	—