This Braemar Modulating Control Board (MCB) is a direct replacement part for Braemar THM5 Natural Gas (NG) ducted heaters, vital for maintaining consistent indoor temperatures. In Australia's varied climate, having your heating system running right is crucial for comfort and efficiency, especially during those colder mornings.

Anyone who's done a few heater services knows that chasing intermittent faults on a dying board can waste a lot of time on site. Swapping in a new, genuine MCB often sorts it out fast.

Best for: HVAC service technicians, gas fitters, and owners of Braemar THM5 NG ducted gas heaters requiring a genuine replacement part.

Compatibility

This control board is specifically designed for Braemar THM5 Natural Gas (NG) ducted heating systems. It's a direct OEM replacement to ensure correct modulation and heater function.

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

Features

• Genuine Braemar part, ensuring perfect fit and function.
• Modulating Control Board (MCB) for precise gas valve operation.
• Restores accurate temperature control and system efficiency.
• Designed for Natural Gas (NG) ducted heater applications.

What's in the Box

• 1 x Braemar Modulating Control Board (MCB) THM5 NG (SY640365)

Using It on the Job

1. Safety First: Before starting any work on a gas appliance, ensure the power is isolated at the main switchboard and the gas supply is shut off. Tag out circuits as required.

2. Access the Heater: Carefully open the heater unit to access the existing control board. Document wiring connections with photos before disconnecting.

3. Replace the Board: Disconnect all wiring from the old MCB, remove it, and install the new Braemar SY640365 board. Ensure all connections are secure and correctly re-attached.

4. Test Operation: Restore gas and power, then cycle the heater through its functions. Check for proper ignition, flame sensing, and modulation through several heating cycles.

5. Commissioning: Confirm all safety devices operate correctly and that the heater is functioning to manufacturer specifications. Complete any required gas appliance service records.

Limitations & Safety Notes

• Installation and servicing of gas appliances must be performed by a licensed gas fitter in accordance with Australian standards.
• Ensure the power and gas supply are completely isolated before attempting any work on the appliance.
• This board is specifically for Natural Gas (NG) systems. Do not use with LPG unless the heater is specifically converted and approved for it.
• Only compatible with Braemar THM5 ducted gas heater models.

Tradie Pro Tip

Before condemning the old board, always double-check all associated sensors, ignitors, and wiring for corrosion or loose connections. Sometimes it's a cheaper fix than a full board swap, but if the fault points to the MCB, a genuine replacement is the way to go.

Pair With

Pair with a new ignitor or flame sensor if those components are also due for replacement, and ensure you have a reliable digital manometer for checking gas pressures.