Triangle Tube Error E4: No Flame Signal
The boiler detects no flame signal during ignition and locks out, meaning it cannot establish a burner flame. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The boiler detects no flame signal during ignition and locks out, meaning it cannot establish a burner flame.
Triangle Tube 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 Triangle Tube error E4
- Manual gas valve closed or low gas supply pressure
- Air trapped in the gas line
- Dirty or faulty ignition/flame electrode
- Faulty ignition unit or gas valve
- Low incoming power / wiring fault
What you can safely check
- Confirm the gas is on by checking another gas appliance works
- Check that any manual gas shutoff at the boiler has not been left closed
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 E4 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 Triangle Tube 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 Triangle Tube error E4
Genuine Triangle Tube parts we supply and professionally install — never for DIY.
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Every repair and installation is backed by genuine parts, licensed workmanship, and a promise to make it right.
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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.
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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.
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Backed by the full HVAC resources of CanroHeat.ca and four decades of service in Greater Vancouver since 1985.
Triangle Tube Error E4 Repair Across Metro Vancouver
Related Triangle Tube Ignition & Flame Codes
Frequently Asked Questions
Fix Triangle Tube Error E4 Today
Licensed Triangle Tube 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