Dunkirk Error E03: Gas valve disconnected
The IMBC control does not see the gas valve connected (open circuit on the gas valve connection). The boiler cannot fire and enters hard lockout. Display shows 'E03'; manual RESET required after the connection is restored. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The IMBC control does not see the gas valve connected (open circuit on the gas valve connection). The boiler cannot fire and enters hard lockout. Display shows 'E03'; manual RESET required after the connection is restored.
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 E03
- Gas valve wiring harness unplugged or loose
- Broken or damaged gas valve wire / connector
- Failed gas valve coil (open circuit)
- Corroded terminals at the valve or control board
What you can safely check
- No homeowner-safe checks inside the boiler - wiring and gas valve work must be done by a licensed technician
- Note when the code appeared (e.g. after service) to help the technician
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.
Error E03 usually leaves you without heat or hot water and can indicate a safety-related fault. Don't keep resetting it — call for priority after-hours Dunkirk repair.
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Parts often behind Dunkirk error E03
Genuine Dunkirk parts we supply and professionally install — never for DIY.
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Dunkirk Error E03 Repair Across Metro Vancouver
Frequently Asked Questions
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