This Honeywell L4064B2236 fan limit switch is a direct replacement for Brivis ducted gas heaters, crucial for managing blower operation and preventing overheating. It's an auto-reset model, meaning it kicks back in automatically once temperatures are back in spec.

Keeping your ducted heating system running safely and efficiently, especially during those unexpected cold snaps in the Aussie winter, depends on reliable components like this. If the fan isn't cutting in or out properly, this switch is often the first thing a tech will check.

Best For

Australian HVAC techs, service and maintenance teams working on Brivis ducted gas heaters, and competent DIY owners familiar with appliance repair.

Compatibility

This fan limit switch is specifically designed for Brivis ducted gas heating systems. It's a direct cross-reference for Brivis part numbers B0000112 and 80000112, and the Honeywell L4064B2236. If you're running a different model, check fittings and specs before ordering.

Features

• Honeywell Reliability: A trusted name in HVAC controls.
• 8-Inch Probe: Ensures accurate temperature sensing within the furnace plenum.
• Auto-Reset Functionality: Automatically restores operation once safe temperatures are reached.
• Direct Brivis Replacement: Cross-references to Brivis P/N B0000112 and 80000112 for easy swapping.

Technical Specifications

What's in the Box

• 1 x Honeywell 8-inch Auto Reset Fan Limit Switch (HWL4064B2236)

Using It on the Job

1. Isolate Power: Always cut power to the ducted gas heater at the main switchboard. Tag and lock out for safety before starting any work.
2. Access Compartment: Carefully locate and remove the heater panels to access the existing fan limit switch.
3. Document Wiring: Disconnect the wiring from the old switch, taking a clear photo or marking wires to ensure correct re-connection.
4. Replace Switch: Remove the faulty switch and install the new Honeywell L4064B2236, making sure the 8-inch probe is seated correctly in the plenum.
5. Reconnect and Secure: Re-attach all wiring exactly as documented, then replace all access panels.
6. Test Operation: Restore power and test the heater to confirm the fan cycles on and off as expected with the burner's operation.

Limitations & Safety Notes

• Always isolate power before attempting any electrical work on HVAC systems.
• Ensure the probe length matches the original component for correct temperature sensing and safe operation.
• Installation should only be performed by a qualified technician in accordance with Australian standards and local regulations.
• This switch is only compatible with Brivis systems requiring the specified 8-inch auto-reset fan limit switch.

Tradie Pro Tip

Before you pull the old switch out, take a quick photo of the wiring. It saves a lot of head-scratching when you're putting the new one in, especially on older units where the wiring colours might be faded or non-standard.

Pair With

Pair with other Brivis heating spares, such as a new ignition module or pressure switch, or an appropriate multimeter for testing circuits and continuity.