glow worm fuel saver f

[dmorganuk06]

hi i have had some building work done the builders cut through the boilers live which was a pain when rewired it did not work so they replaced the board pcb i think and the fan but the internal fuse keeps blowin after ten ish mins some times last a hour or so
before they broke it the valve thing that selects hw or ch didnt work so they replaced that since been rewired after cutting it the fuse just keeps on blowing please help
regards david morgan

 

[namsag]

Tell them to leave it alone and get a proper heating guy out most builders/sparks do not understand how CH is wired ,it needs someone who works on it all the time