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Thank you to all whom have replied. All has been rectified. The problem was the cable to the neutral terminal for the pump connection on the pcb. The cable which is blue should have been wired to the SWL terminal on the pcb as it is connected to the valves orange cables in the wiring box The...

Thank you L/N to PCB have been wired correctly. How ever the orange wires from the valves have been connected via the wiring box to behind the programmer and connected into the N ot the pump cable which leads to the pcb which does not look correct to me. I have cheked this using a meter...

Thanks Tony, Pump OK being running for an hour. The orange cables from the MPE 222 are connected into the wiring box but where does that cable go to. According to the schematic wiring diagram it should be connected to the SWL on the boiler. Is this correct as my installation has no cable...

I have disconnected the pump but the fuse still blew. The wire to each component was checked by the electrican as being OK. I have double checked this, it appears to be wired to a typical Potterton Central Heating and Hot water Zone Valves terminal Connection Diagram.

Hi, Thanks for the advise. Got a heating engineer to look at the pcb/boiler and controls, He checked the boiler, fuses kept on blowing out. He checked both the room stat and HW stat. Both OK. eventually he by past the programmer to fire the boiler and said I would need a new programmer...

I have just re installed the old pcb but it also blew the fuse. Any further advise?

Thanks for the advise:- all wires OK and free from body of boiler casing. Ohms readings; pump 0.19 and Fan 0.05. PCB replaced because the old one was locking out. The cylinder stat would call for heat, boiler light and go out after less than a minute. Had an engineer call after I had not...

I have just installed the above in a Potterton Suprima 60, but it keeps blowing the main 3amp fuse in the electrcial supply spur after abovce 20 seconds. I have checked the mains wiring onto the terminal block and also onto the PCB both OK. I know the next stage is to check for shorts on Pump...