Dunkirk Error E65 (Helix): Flue
Blocking (auto-reset) error on the Helix VLT control: the flue / vent temperature sensor reads shorted (resistance does not match estimated flue temperature). The control holds off and returns to standby when a valid reading is restored. Display shows 'E65 Flue Sens Shorted'. (Note: on the Q90 control, E65 instead means insufficient blower driving force - see Q90 entry.) We diagnose and repair it across Greater Vancouver — same-day and after-hours.
Blocking (auto-reset) error on the Helix VLT control: the flue / vent temperature sensor reads shorted (resistance does not match estimated flue temperature). The control holds off and returns to standby when a valid reading is restored. Display shows 'E65 Flue Sens Shorted'. (Note: on the Q90 control, E65 instead means insufficient blower driving force - see Q90 entry.)
Dunkirk fault codes can vary by model and series. Use this as a guide — the same code can have more than one cause. Our Technical Safety BC–licensed technicians read the code, confirm it against your unit's manual, and diagnose the true cause before any repair.
Likely causes of Dunkirk error E65 (Helix)
- Shorted flue/vent temperature sensor
- Pinched or damaged sensor wiring
- Moisture/corrosion in the sensor connector
- Failed control module input
What you can safely check
- No homeowner-safe internal checks - have a technician test the flue/vent sensor resistance
Beyond these checks, do not open the unit or touch gas/electrical parts — BC law requires a licensed gas fitter. Call us for a proper diagnosis.
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Parts often behind Dunkirk error E65 (Helix)
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Dunkirk Error E65 (Helix) Repair Across Metro Vancouver
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