This Vulcan Quasar Yellow Dot Switch Fan Thermostat (CT-YELLOWDOTB) is a critical genuine spare part designed to keep your Bonaire 40MJ wall furnace running smoothly. It's the component that tells your furnace fan when to kick in and when to shut off, based on temperature.

Getting the fan operation right is key for efficient heating, especially on those chilly Australian winter mornings when you need heat fast and don't want cold draughts from a fan that's not cutting in properly. A dodgy fan thermostat can throw off your whole heating cycle.

Best For

• HVAC service technicians maintaining Bonaire and Vulcan Quasar heating systems.
• Installers performing warranty or post-warranty repairs on Bonaire 40MJ wall furnace units.
• Competent DIY owners replacing failed fan thermostats in compatible units.

Compatibility

• Specifically designed for Vulcan Quasar wall furnace units.
• Compatible with 40MJ Quasar furnace models.
• Bonaire Part Number: 2265900SP.

If you're running a different model, check fittings and specs before ordering.

Features

• Direct OEM Replacement: Ensures a perfect fit and function for specific Vulcan Quasar units.
• Reliable Fan Control: Regulates the furnace fan operation based on internal temperature, optimising heating efficiency.
• Original Specification: Manufactured to Bonaire PN 2265900SP standards for guaranteed performance.
• Durable Construction: Built to withstand typical operating conditions within a wall furnace.

What's in the Box

• 1 x Vulcan Quasar Yellow Dot Switch Fan Thermostat (CT-YELLOWDOTB)

Using It on the Job

1. Isolate Power: Always ensure the heating unit's main power supply is completely isolated and locked out before commencing any work.
2. Access Unit: Carefully remove the furnace cover panels to gain access to the existing fan thermostat and wiring.
3. Document & Disconnect: Take photos of the existing wiring connections. Disconnect the old thermostat, noting wire positions.
4. Install New Thermostat: Mount the new CT-YELLOWDOTB thermostat and reconnect wiring precisely as per your documentation.
5. Test Operation: Restore power and carefully test the furnace operation, observing the fan cut-in and cut-out cycles to ensure correct function.
6. Secure & Complete: Once confirmed operational, re-secure all panels and ensure no tools or debris are left inside the unit.

Limitations & Safety Notes

• This thermostat is for use only on the specified Vulcan Quasar 40MJ wall furnace units.
• Electrical work on heating appliances should only be performed by qualified personnel or competent individuals following all safety guidelines.
• Always verify the correct part number (Bonaire PN 2265900SP) before installation to ensure compatibility.
• Follow all Australian standards and Safe Work guidance when servicing heating equipment.

Tradie Pro Tip

"When you're replacing a fan thermostat, it's a good habit to give the fan assembly a once-over for dust build-up and make sure the motor bearings are still quiet. A seized or struggling fan motor can put extra strain on the new thermostat and lead to early failure."

Pair With

Pair with other Bonaire heating spares, such as furnace ignitors or pressure switches, to keep your ducted gas heater running efficiently. For diagnostic work, consider a digital multimeter from our range to check wiring and continuity.