Boiler issues

GP:

We have a Potterton Combi boiler, it was losing pressure. Engineer replaced the diverter valve and said it was corroded. It worked fine for a few days before making a loud banging noise for s few minutes which stopped when the sink taps were on. It was ok for a couple of days and then went off completely. The engineer says the circuit board needs replacing but I'm wondering what caused the issue with the circuit board & whether it will just blow again. I think the boiler is about 8 years old. Any advice welcome. 

Loud banging noises sometimes mean there is a problem with the circulation around the boiler/system. If water isn't flowing fast enough through the heat exchanger, water boils and turns to steam causing the banging in the pipes, you often hear "kettling" first like a kettle warming up. Then hopefully the overheat stat cuts off the gas.

so could be pump, PCB supply to the pump, blocked heat exchanger or sometimes all the rads have been turned off and there's no bypass.

GP:

We have a Potterton Combi boiler, it was losing pressure. Engineer replaced the diverter valve and said it was corroded. It worked fine for a few days before making a loud banging noise for s few minutes which stopped when the sink taps were on. It was ok for a couple of days and then went off completely. The engineer says the circuit board needs replacing but I'm wondering what caused the issue with the circuit board & whether it will just blow again. I think the boiler is about 8 years old. Any advice welcome. 

Loud banging noises sometimes mean there is a problem with the circulation around the boiler/system. If water isn't flowing fast enough through the heat exchanger, water boils and turns to steam causing the banging in the pipes, you often hear "kettling" first like a kettle warming up. Then hopefully the overheat stat cuts off the gas.

so could be pump, PCB supply to the pump, blocked heat exchanger or sometimes all the rads have been turned off and there's no bypass.