Can I reset my Triangle Tube boiler to clear the Return Sensor 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 Return Sensor 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 Triangle Tube Return Sensor 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.

Triangle Tube Error Code

Triangle Tube Error Code Return Sensor

Return sensor open/shorted.

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If your Triangle Tube combi boiler is showing error code Return Sensor, here's what it means: Return sensor open/shorted. This is a moderate fault. The boiler may keep running intermittently, but it should be diagnosed soon to prevent further damage.

Triangle Tube boilers report faults using descriptive acvmax/smart faults. Knowing the code helps a technician arrive prepared with the right parts, which usually means a faster, lower-cost repair.

What causes the Return Sensor code?

Error Return Sensor on a Triangle Tube boiler is most commonly caused by one of the following:

Sensor failure
Wiring

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 Return Sensor 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 Triangle Tube 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 Triangle Tube codes & help

Triangle Tube Ignition FailureNo flame after ignition attempts.Triangle Tube Flame LossFlame lost during firing.Triangle Tube High LimitOver-temperature limit reached.Triangle Tube Supply SensorSupply sensor open/shorted.Triangle Tube Flue SensorFlue sensor fault or over-temp.All Triangle Tube Error CodesFull list

Fix Your Triangle Tube Return Sensor Fault

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