I was called to repair this Potterton Perfoma 24 boiler because it was not performing at all !. No wander the other Corgi engineer has taken the PCB ( printed circuit board) with him. During investigation, a leaking diverter valve is found. If left not repaired this boiler may develop other faults. Electrical failure due to water ingress, boiler go to low pressure, no hot water but heating ok, are just 3 possibilities and guess what there are more…. …………Contact us to get it repaired.!