Dunkirk Error E45: Net
Blocking (auto-reset) error: the control sees the AC line frequency outside the acceptable window (power supply must be 59-61 Hz / 60 Hz +/-2%). The boiler holds off until stable power is restored. Display shows 'E45 Net frequency error'. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
Blocking (auto-reset) error: the control sees the AC line frequency outside the acceptable window (power supply must be 59-61 Hz / 60 Hz +/-2%). The boiler holds off until stable power is restored. Display shows 'E45 Net frequency error'.
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 E45
- Unstable or out-of-spec utility/generator power (frequency not 60 Hz +/-2%)
- Loose or faulty power-supply circuit breaker
- Loose field wiring on the line supply
- Boiler fed from an inverter/generator with poor frequency regulation
- Failed control module
What you can safely check
- If running on a generator, ensure it is sized and regulated for 60 Hz; switch back to utility power if possible
- Check whether other electronics in the home are also acting up (sign of bad power)
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 E45
Genuine Dunkirk parts we supply and professionally install — never for DIY.
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Dunkirk Error E45 Repair Across Metro Vancouver
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