341
Takagi Exhaust Thermistor Failure

Error 341 displayed; unit does not start.

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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

Failed exhaust thermistor, Damaged wiring from exhaust sensor, Overheat damage due to vent blockage, Loose connector at PCB

How to Fix / Troubleshooting

Safety first: Turn OFF power and gas. Exhaust components can be very hot; wait until cool.

Steps:

  • 1. Inspect venting: Before replacing parts, check for blocked or restricted exhaust venting that may have overheated the sensor. Clear any obstructions and correct venting issues.
  • 2. Locate exhaust thermistor: Typically mounted near the flue collar or exhaust outlet inside the unit.
  • 3. Check wiring: Inspect the sensor leads for heat damage or breaks. Reseat the connector at the PCB.
  • 4. Replace thermistor: If wiring is intact but error persists, replace the exhaust thermistor with the correct Takagi part.
  • 5. Verify operation: Restore power and gas, clear the error, and test. If the error returns, have a technician check for chronic venting or combustion issues.
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Repair Difficulty

Hard 4/5

Required Part

Exhaust Thermistor
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