Worcester Bosch Boiler Repair in Orpington – No Heating or Hot Water

We received an urgent call from a homeowner in Orpington who had woken up to a completely cold house. Their Worcester Bosch Greenstar i-series boiler had entered a total lockout state, resulting in a complete loss of both central heating and domestic hot water. When our engineer arrived, they found the boiler display completely blank, showing no power despite the fused spur being live. Upon initial investigation, the engineer performed a multimeter test on the main power supply and the incoming PCB connections. It became clear that the printed circuit board (PCB) had suffered a catastrophic failure, likely due to a power surge, preventing the ignition sequence and the pump from activating. The customer was understandably concerned as the temperatures were dropping, and they needed a swift resolution to restore comfort to their home.

After confirming the diagnosis, our engineer sourced a genuine Worcester Bosch replacement PCB from our local stock inventory. They first isolated the boiler electrically and drained the necessary internal components to ensure a safe working environment. The old board was carefully removed, ensuring all ribbon cables and electrical plugs were disconnected without causing damage to the boiler's delicate wiring harness. The new PCB was fitted, and all connections were meticulously verified against the manufacturer's wiring diagram. After restoring power, the engineer performed a full system reset to initialize the new component. We then conducted a combustion analysis using a flue gas analyzer to ensure that the air-to-gas ratio was optimal and that the boiler was operating within safe flue-gas emission parameters. Finally, we checked for any leaks around the internal pipework and verified that the pump and fan were modulating correctly to meet the thermostat demand.