Baxi Power Supply Module 7687124

The Baxi 7687124 is a power supply module — the board that takes mains voltage and delivers the regulated low-voltage supply the appliance's control electronics need to run. It is a Baxi-manufactured spare, listed against the Broag Commercial appliance range, and is used where the original module has failed or is no longer delivering a stable supply.

Because the module sits between the mains input and the control PCB, a fault here typically shows up as a dead or repeatedly resetting appliance rather than as a mechanical or combustion problem.

• The appliance is completely dead with no display or indicator LEDs, despite a confirmed live mains supply at the isolator.
• The control panel powers up briefly then drops out, or the appliance resets repeatedly during a demand for heat.
• The internal fuse blows again immediately after replacement, pointing to a fault on the supply side of the board.
• Visible heat damage, discoloured tracks or bulging components on the module itself.
• Intermittent lockouts that clear on their own and cannot be traced to a sensor, fan or gas-side fault.

• Confirm the appliance model and serial number against the compatibility list, as Baxi uses more than one supply board across its ranges.
• Note the alternative number 1134703 — it may appear on the label of the module already fitted to your appliance.
• Check whether any gasket, seal or mounting kit is required for your particular appliance before starting the repair.
• Isolate the mains supply and follow the manufacturer's wiring and polarity instructions when fitting the replacement module.