Potterton Boiler Breakdown in Dartford – System Shutting Down Overnight

We were contacted by a resident in Dartford who was experiencing frustrating issues with their Potterton boiler. Every morning, they would wake up to a freezing home because the boiler had completely shut down during the night. The display screen would be blank, and the system would only restart after a manual reset at the fused spur. This intermittent loss of power was causing significant disruption to their daily routine. Upon our initial consultation, the customer explained that the boiler would cycle normally for most of the day but fail during the quiet early morning hours. After checking the external power supply, we suspected an internal component failure rather than a grid issue. The boiler was consistently tripping its internal fuse or failing to hold the ignition sequence once the ambient temperature dropped significantly, suggesting a fault within the printed circuit board (PCB) or a loose connection in the wiring loom.

Our Gas Safe engineer arrived equipped with the necessary diagnostic tools for Potterton systems. After performing a full electrical safety test, we confirmed that the PCB was suffering from thermal fatigue, causing it to lose communication with the gas valve and ignition module during cold periods. We isolated the unit from the mains and carefully inspected the wiring harnesses for any signs of heat damage or moisture ingress, ensuring all connections were secure. To resolve the fault, we sourced and installed a new genuine Potterton PCB, ensuring the system was recalibrated to match the boiler's specific output settings. Following the replacement, we performed a thorough combustion analysis using our flue gas analyzer to check CO2 levels and gas pressure. Finally, we put the boiler through a rigorous series of test cycles, ensuring that the ignition sequence initiated correctly and that the unit held pressure under demand, successfully restoring the home’s central heating.