Burnham Error 23: 24 VAC Control Power High or Low
Hard lockout: the Sage control's 24 VAC control power is too high or too low. The control cannot operate safely outside its voltage window. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
Hard lockout: the Sage control's 24 VAC control power is too high or too low. The control cannot operate safely outside its voltage window.
Burnham 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 Burnham error 23
- Failing or undersized 24 VAC transformer
- Loose or corroded low-voltage wiring connections
- Overloaded 24 VAC circuit (too many accessories/zone valves)
- Incoming line-voltage problem affecting the transformer output
What you can safely check
- Confirm the boiler is on a stable, dedicated circuit if possible
- Call a licensed technician to check the transformer and low-voltage wiring
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 23 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 Burnham 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 Burnham error 23
Genuine Burnham 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.
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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.
Burnham Error 23 Repair Across Metro Vancouver
Frequently Asked Questions
Fix Burnham Error 23 Today
Licensed Burnham diagnosis and repair with genuine parts — same-day and after-hours across Greater Vancouver.
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