Brivis Gas Heater Thermocouple 18 Inch

This Brivis Gas Heater Thermocouple is a flame supervision component for compatible Brivis ducted gas heaters. It helps prove that the pilot flame is present, supporting safe heater operation and helping prevent gas flow where ignition has not been established.

A failing thermocouple can cause intermittent pilot dropout, no-heat faults, or ignition problems that are easy to confuse with other heater issues. Before ordering, confirm the original part number, thermocouple length, connection style, pilot assembly type, gas heater model, and fault symptoms so you do not replace a working thermocouple when the issue is actually with the pilot assembly, gas valve, control board, pressure switch, wiring, or gas supply.

Best For

• Licensed gas fitters replacing a confirmed faulty Brivis thermocouple.
• HVAC service and maintenance teams diagnosing flame-sensing or pilot dropout faults.
• Compatible Brivis gas heater systems that use the matched Honeywell Q309A4040 thermocouple.

Compatibility

This Brivis thermocouple is designed for compatible Brivis gas heaters that use an 18 inch clip-in style thermocouple. It is associated with Honeywell part number Q309A4040 and Brivis part numbers B009065 and 80009065. HVAC Shop SKU: HLQ309A4040.

If you are running a different model, check the existing thermocouple, pilot assembly, connection style, heater data plate, and original part numbers before ordering. Do not order by appearance alone.

Need help choosing? Read our Brivis heater flame sensing fault guide before ordering to confirm whether the thermocouple, pilot assembly, control board, pressure switch, gas valve, transformer, or wiring is the more likely cause of the no-ignition fault.

Features

• Genuine Brivis Replacement: Suits compatible Brivis gas heater applications where the original part number and connection style match.
• 18 Inch Length: Designed for matched heater applications that require this thermocouple length.
• Clip-In Style: Suits compatible pilot assemblies that use this clip-in thermocouple arrangement.
• Flame Supervision Component: Helps confirm pilot flame presence as part of the heater safety sequence.

Technical Specifications

What's in the Box

• 1 x Brivis Gas Heater Thermocouple, 18 inch clip-in style (HLQ309A4040)

Installation Notes

1. Confirm the Fault: A licensed gas fitter should confirm whether the thermocouple is faulty or whether the issue is caused by the pilot assembly, gas valve, pressure switch, control board, transformer, wiring, gas supply, or dirty pilot flame path.
2. Match the Part Number: Check the existing component and confirm Honeywell Q309A4040, Brivis B009065, Brivis 80009065, or HVAC Shop SKU HLQ309A4040 before ordering.
3. Match the Style: Confirm the thermocouple length, clip-in connection style, pilot assembly type, and routing match the original component.
4. Fit According to Manufacturer Information: The replacement thermocouple should be installed using the correct Brivis service information for the specific heater model.
5. Test and Commission: After installation, the licensed gas fitter should test pilot flame stability, flame supervision, ignition operation, burner operation, and safe heater operation before returning the unit to service.

Limitations & Safety Notes

• Thermocouple replacement is gas appliance service work and should be carried out by a licensed gas fitter in accordance with AS/NZS 5601.1 and local requirements.
• This part is for compatible Brivis gas heater applications where the original thermocouple, length, connection style, and part number match.
• Do not order by appearance alone. Match the original component, heater data plate, pilot assembly, gas type, and part number before ordering.
• Correct thermocouple tip position in the pilot flame is critical for reliable flame supervision and safe heater operation.
• Gas leak testing, ignition checks, flame supervision checks, and heater commissioning must be completed by appropriately licensed tradespeople after installation.
• If you smell gas, turn off the gas supply if safe to do so, avoid ignition sources, leave the area, and contact your gas emergency provider or licensed gas fitter.

Before replacing a thermocouple, confirm it is the actual fault. A dirty pilot assembly, poor flame position, weak pilot flame, gas valve issue, loose connection, or separate ignition fault can mimic a failed thermocouple. A proper fault path check helps avoid repeat call-backs.

Pair With

Pair with compatible Brivis pilot assemblies, pressure switches, control boards, gas valves, transformers, wiring components, and diagnostic tools when completing a full no-ignition or flame-sensing fault diagnosis. Always confirm the exact fault before replacing gas appliance components.