Takagi
Overheating / Temperature Overshoot
Water is excessively hot; sudden spikes in temperature from Takagi water heater.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Faulty outlet thermistor, Sticking gas valve, Malfunctioning mixing valve, Incorrect temperature setting or remote malfunction
How to Fix / Troubleshooting
Safety first: Risk of scalding. Immediately lower the temperature setting on the remote to 120°F or less. Warn occupants, especially children and elderly.
Steps:
- 1. Confirm set temperature: Verify the remote is not set above the intended temperature. Reduce if necessary.
- 2. Check mixing valve: If a mixing valve is installed, ensure it is not stuck or set too high. Adjust per manufacturer instructions.
- 3. Inspect thermistor connections: With power OFF, remove the cover and check that the outlet thermistor connector is secure and wiring is intact.
- 4. Professional service: If overheating continues, a technician should test the outlet thermistor, gas valve modulation, and control board. Do not continue using the heater at unsafe temperatures.
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Repair Difficulty
Hard
4/5
Required Part
Outlet Thermistor
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