Weil-McLain Boiler Error Codes

A plain-English reference to 9 common Weil-McLain fault codes — what each means, what causes it, and when to call a licensed BC gas technician.

Weil-McLain boilers report named fault conditions on the control display. With over 140 years of boiler engineering, Weil-McLain units are durable — and the fault name points straight to the affected system. This reference covers the common Weil-McLain faults and why flame, blower, gas and venting faults call for a licensed BC technician.

Smell gas? Leave the building immediately and call 911 or FortisBC at 1-800-663-9911 from outside. Never bypass a safety lockout or attempt gas work yourself — in BC it must be done by a licensed gas fitter.

Ignition fault

Weil-McLain Ignition LockoutIgnition Lockout

Flame failure

Weil-McLain Flame LossFlame Loss During Operation

Water-flow / circulation fault

Weil-McLain Low Water Cut-OffLow-Water Cut-Off (LWCO)

Over-temperature / high-limit

Weil-McLain High LimitHigh-Limit / Over-Temperature

Temperature-sensor fault

Weil-McLain Supply Sensor FaultSupply Sensor Fault Weil-McLain Return Sensor FaultReturn Sensor Fault

Combustion-fan fault

Weil-McLain Blower FaultCombustion-Blower Fault

Air-pressure / venting fault

Weil-McLain Pressure FaultAir-Pressure / Venting Fault

Condensate fault

Weil-McLain Condensate FaultCondensate Drainage Fault

Weil-McLain error codes — FAQ

Why is my Weil-McLain boiler showing an error code?

Weil-McLain boilers display a fault code when a safety circuit detects a problem — for example with ignition, flame, water flow, temperature or venting. The code points to the affected system. The boiler shuts down to protect itself; a licensed technician then diagnoses the true root cause before repair.

Can I just reset my Weil-McLain boiler?

A single reset after a one-off event is usually fine, but repeated resets without fixing the cause can be unsafe — especially for ignition, gas and venting faults — and can cause further damage. If the code returns, switch the boiler off and call GasBoilers.ca at 604-359-1081.

Do you repair all Weil-McLain boiler models in Greater Vancouver?

Yes. Our Red Seal–certified, gas-licensed technicians service Weil-McLain ECO, ECO Tec, Ultra and Evergreen series across Vancouver, Burnaby, Surrey, Richmond, the Tri-Cities and the rest of Greater Vancouver. Same-day appointments are often available.

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Error codes by brand

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Get your Weil-McLain boiler back up and running

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