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

Yes. We supply and professionally install the genuine part across Greater Vancouver. Our licensed technicians diagnose the fault, fit the correct OEM part, and test the system.

Do you sell the John Wood 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 John Wood supply / return thermistor as part of a certified repair so it is fitted correctly, tested for safety, and keeps your John Wood warranty valid.

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

Typical symptoms include: Short-cycling; Over/under-heating; Temperature-sensor error codes; Inaccurate display temperature. On John Wood boilers this can also show as No Hot Water or Pilot Problems. We confirm the diagnosis before any work.

John Wood · Controls & Sensors

John Wood Supply / Return Thermistor Replacement in Greater Vancouver

Genuine John Wood 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 John Wood 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 John Wood systems — including models such as Envirosense, JW Power Vent, JW Direct Vent — a failing supply / return thermistor often shows up as no hot water or related symptoms. We diagnose it precisely and install the correct genuine John Wood part.

Typical Lifespan

8-12 years

Brand

John Wood

Part Category

Controls & Sensors

Safety Warning

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

Signs of a Failing John Wood 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.

Why Have Us Install Your John Wood Supply / Return Thermistor?

Genuine John Wood OEM supply / return thermistor — no generic substitutes

Installed by Technical Safety BC–licensed gas fitters

Keeps your John Wood manufacturer warranty intact

Full combustion, pressure and safety testing after fitting

Up-front pricing — you approve before we start

Backed by our workmanship guarantee

About the Supply / Return Thermistor All John Wood service

John Wood Supply / Return Thermistor Service Across Metro Vancouver

Frequently Asked Questions

John Wood Supply / Return Thermistor Replacement, Done Right

Genuine John Wood parts, professionally installed and tested across Greater Vancouver.

Call (604) 359-1081 Request Service

A Division of CanroHeat.ca · Licensed Gas Fitters · Serving Greater Vancouver since 1985