Boiler displays error 06, no ignition, often after a power surge or wiring disturbance.

Safety: Isolate the boiler from the mains before accessing the control board. Only qualified personnel should replace electronic control boards.

• Power cycle: Turn off the boiler at the isolator for 2–3 minutes, then restore power to clear transient faults.
• Check supply polarity and earth: Verify that live, neutral, and earth are correctly connected and secure at the boiler terminal block. Incorrect polarity can cause control faults.
• Inspect PCB connections: Remove the front cover and check all multi-pin connectors on the PCB for secure fit and signs of overheating or moisture ingress.
• Look for visible PCB damage: Burn marks, swollen components, or corrosion indicate board failure. In such cases, replace the PCB with the exact Immergas part number.
• Surge protection: If the fault followed a storm or power surge, consider installing an external surge protector to protect the new board.
• Commissioning: After PCB replacement, configure boiler parameters (if required) according to the Immergas service manual and test all functions.