Can I reset my Laars boiler to clear the Supply Sensor Fault code?

You can reset once if your manual says it's safe. If the code returns, stop resetting — repeated resets on a genuine fault, especially gas or overheat faults, can be unsafe and may worsen the problem. Book a licensed repair instead.

Is the Supply Sensor Fault fault dangerous?

It's not usually an immediate safety emergency, but it should be diagnosed to prevent further damage and restore reliable operation.

How much does it cost to fix a Laars Supply Sensor Fault fault?

Cost depends on the underlying cause — some causes (like low pressure or a dirty sensor) are minor, while others (like a gas valve or control board) cost more. We diagnose first and give you a clear price before any repair.

Laars Error Code

Laars Error Code Supply Sensor Fault

The outlet water temperature sensor is open or shorted.

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If your Laars combi boiler is showing error code Supply Sensor Fault, here's what it means: The outlet water temperature sensor is open or shorted. This is a moderate fault. The boiler may keep running intermittently, but it should be diagnosed soon to prevent further damage.

Laars boilers report faults using fault codes and lockout messages on the mascot ft / ft fire-tube display. Knowing the code helps a technician arrive prepared with the right parts, which usually means a faster, lower-cost repair.

What causes the Supply Sensor Fault code?

Error Supply Sensor Fault on a Laars boiler is most commonly caused by one of the following:

Faulty sensor
Wiring fault
Control fault

What you can safely check first

Note the exact code and your boiler's model number
Check the pressure gauge — low pressure triggers many faults
Confirm the gas supply is on and other gas appliances work
Reset the boiler once, per the manual, only if it's safe to do so
If the code returns, stop and call a licensed technician

Why this needs a licensed technician

Resolving a Supply Sensor Fault fault almost always involves the gas, combustion, sensor or pressurized side of the appliance. Under BC's Safety Standards Act, that work must be performed by a licensed gas fitter — and doing it correctly protects your warranty and your safety. We diagnose Laars boilers, carry common parts, and verify clean combustion before returning your boiler to service.

This is not a DIY repair

Combi boilers are gas-fired appliances regulated under the BC Safety Standards Act. Opening the unit, touching the gas valve, or working on the flue without a valid BC gas-fitter licence is both unsafe and illegal. Diagnosing the fault is helpful — fixing it should always be left to a certified technician.

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Frequently Asked Questions

Other Laars codes & help

Laars Ignition LockoutNo flame was detected after the ignition sequence, so the…Laars Flame FailureThe flame was lost during a heating or hot-water call.Laars High Limit LockoutThe boiler overheated past its safe limit.Laars Low Water PressureSystem pressure is too low to operate safely.Laars Return Sensor FaultThe inlet water temperature sensor is open or shorted.All Laars Error CodesFull list

Fix Your Laars Supply Sensor Fault Fault

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