The Takagi gas valve controls gas flow to the burner. Modulating solenoid that lets the unit fire from 15% to 100% of max BTU.
Why dealer-only
- Gas-line work — licensed plumber territory
- Factory-calibrated for NG or LP
- Improper install creates leak hazard
- Warranty voided if non-licensed person does gas work
Symptoms
- Burner won't light — solenoid stuck closed
- Burner stuck at full fire
- Burner stuck at low fire
- Burner won't shut off
Cost
- Parts: $250-500 OEM
- Labor: $300-600
- Total: $550-1,100
NG to LP conversion
Requires Takagi LP conversion kit + licensed installer to recalibrate.
Bottom line
Suspect gas valve = call Takagi support. Don't operate if stuck-open suspected.