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i have main fuse keep blowing on my central heating system could this be the pump ?...ive changed the acuator and Stat ! but it keeps on blowing the main 5amp fuse (in the fuse box)after 5 minutes after switching on ! any ideas !...the pump feels cold when the heating system fuses after being...

i have apollo 15/30 type wall mounted boiler and have an electric (i think ) fault in the system ..at first it blew the main fuse after boiler was on an hour after the heating switched off and the boiler ran on for 20 min...then several time it blew after 5 minutes of switching heating on..ive...