Can I reset my Laars boiler to clear the High Limit Lockout 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 High Limit Lockout fault dangerous?

Treat it as urgent. This code involves systems where continued operation can be unsafe. Turn the boiler off if it keeps recurring and call for a licensed repair; if you smell gas, leave and call your gas utility's emergency line.

How much does it cost to fix a Laars High Limit Lockout 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 High Limit Lockout

The boiler overheated past its safe limit.

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Licensed & Insured Gas-Certified Technicians Serving Vancouver Since 1999

If your Laars combi boiler is showing error code High Limit Lockout, here's what it means: The boiler overheated past its safe limit. This is an urgent fault. Stop using the boiler if it keeps recurring and book a licensed repair promptly — especially if it involves gas, ignition, overheating or the flue.

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 High Limit Lockout code?

Error High Limit Lockout on a Laars boiler is most commonly caused by one of the following:

Failed pump or poor circulation
Airlock
Closed valve
Scaled heat exchanger

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 High Limit Lockout 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.

Smell gas or suspect carbon monoxide? Leave now.

If you smell gas, hear hissing, or your CO alarm sounds, leave the building immediately and call your gas utility's emergency line from outside. Do not operate switches or relight the appliance. Once you are safe, call us for a licensed repair.

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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 Low Water PressureSystem pressure is too low to operate safely.Laars Supply Sensor FaultThe outlet water temperature sensor is open or shorted.Laars Return Sensor FaultThe inlet water temperature sensor is open or shorted.All Laars Error CodesFull list

Fix Your Laars High Limit Lockout Fault

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