Dunkirk Error A01: Ignition error / failed ignition
Lockout Alarm on the Helix VLT control: after the ignition trials (sequence-of-operation note: 5 trials) the burner failed to light/prove flame, so the control latches a hard lockout displayed as A01. Press RESET to clear once the cause is fixed. (Manual's troubleshooting summary phrases it as 'three unsuccessful ignition attempts in a row.') We diagnose and repair it across Greater Vancouver — same-day and after-hours.
Lockout Alarm on the Helix VLT control: after the ignition trials (sequence-of-operation note: 5 trials) the burner failed to light/prove flame, so the control latches a hard lockout displayed as A01. Press RESET to clear once the cause is fixed. (Manual's troubleshooting summary phrases it as 'three unsuccessful ignition attempts in a row.')
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 A01
- No or weak ignition spark (igniter/electrode fault or wiring)
- Gas supply problem - shutoff valve closed, low pressure, or air in line
- Wrong or missing propane orifice on LP units
- Blocked vent system starving combustion air
- Faulty gas valve
What you can safely check
- Confirm the gas shutoff valve to the boiler is fully open
- Check other gas appliances work (rules out a gas outage)
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 A01 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.
Parts Are Professionally Installed — Not Sold for DIY
For your safety and to keep your manufacturer warranty valid, BoilerPart.ca does not sell loose boiler parts over the counter or for self-installation. Under BC regulations, gas appliance components must be installed by a licensed gas fitter. Every part we source is genuine OEM and is professionally fitted, tested, and certified by our Technical Safety BC–licensed technicians as part of a complete repair or installation.
Parts often behind Dunkirk error A01
Genuine Dunkirk parts we supply and professionally install — never for DIY.
Our Guarantees & Warranties
Every repair and installation is backed by genuine parts, licensed workmanship, and a promise to make it right.
Workmanship Guarantee
Every repair and installation is backed by our written workmanship guarantee. If a part we installed fails because of our work, we make it right.
Genuine OEM Parts
We fit only manufacturer-original (OEM) components so your boiler performs to spec and keeps its factory warranty intact.
Manufacturer Warranty Honoured
As an authorised service provider for the brands we work on, our installs preserve and register your manufacturer parts warranty.
Licensed & Insured
All work is completed by Technical Safety BC–licensed gas fitters (Licence LGA0043870, Boiler Permit LBP0046450). We are fully licensed, bonded and insured for your protection.
Up-Front Pricing
You approve the diagnosis and quote before any work begins. No hidden fees and no surprise charges.
Satisfaction Commitment
Backed by the full HVAC resources of CanroHeat.ca and four decades of service in Greater Vancouver since 1985.
Dunkirk Error A01 Repair Across Metro Vancouver
Frequently Asked Questions
Fix Dunkirk Error A01 Today
Licensed Dunkirk diagnosis and repair with genuine parts — same-day and after-hours across Greater Vancouver.
A Division of CanroHeat.ca · Licensed Gas Fitters · Serving Greater Vancouver since 1985