just fitted an s-plan controls pack. getting power to clock. as soon as i switch on heating or hot water- 3amp fuse blows. all wired to the book. any ideas please?
Fuse blowing sounds like a dead short, have you got a neutral connected wrong somewhere?.....for example at your room stat or one of the motorised valves.
all the neutrals are together. but theres loads of em pushed together in the tame wiring center terminal. il ave a look at tommorow. thought it might be that. wired to honeywell wiring guide. never let me down before so i reckon one of the neutrals isnt making contact. cheers.
A 'neutral' not making contact creates a 'open circuit'.
If a 'neutral' is making contact with a 'live' which it shouldn't be then that is a 'short circuit'
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