Can you replace the supply / return thermistor on my Rinnai boiler?

Yes. BoilerPart.ca supplies and professionally installs the genuine Rinnai supply / return thermistor across Greater Vancouver. Our licensed technicians diagnose the fault, fit the correct OEM part, and test the system.

Do you sell the Rinnai supply / return thermistor on its own?

No. Boiler parts are supplied and installed by our licensed technicians as part of a repair — we do not sell parts for individual or DIY purchase. We install the Rinnai supply / return thermistor as part of a certified repair so it is fitted correctly, tested for safety, and keeps your Rinnai warranty valid.

How do I know my Rinnai supply / return thermistor has failed?

Typical symptoms include: Short-cycling; Over/under-heating; Temperature-sensor error codes; Inaccurate display temperature. On Rinnai boilers this can also show as Error 11 No Ignition or Error 12 Flame Failure. We confirm the diagnosis before any work.

Rinnai · Controls & Sensors

Rinnai Supply / Return Thermistor Replacement in Greater Vancouver

Genuine Rinnai supply / return thermistor, supplied and professionally installed by Technical Safety BC–licensed gas fitters. Never sold for DIY.

Call (604) 359-1081 Request Service

The Supply / Return Thermistor on Your Rinnai Boiler

Supply and return thermistors tell the control the water temperature entering and leaving the boiler, enabling modulation and protecting against overheating. A drifting thermistor causes wrong temperatures, short-cycling, or false faults.

On Rinnai systems — including models such as i-Series i090, i120, M-Series — a failing supply / return thermistor often shows up as error 11 no ignition or related symptoms. We diagnose it precisely and install the correct genuine Rinnai part.

Typical Lifespan

8-12 years

Brand

Rinnai

Part Category

Controls & Sensors

Safety Warning

Short-cycling with sensor codes usually means a supply or return thermistor reading incorrectly.

Signs of a Failing Rinnai Supply / Return Thermistor

Short-cycling

Over/under-heating

Temperature-sensor error codes

Inaccurate display temperature

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.