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Boiler not firing

Discuss Boiler not firing at UK Plumbers Forums; Hi all i would really like some advice please 2 zone heating 1 upstairs 1 downstairs on an ideal combi boiler 2 Honeywell cm707 programmable stats one for each valve ...
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    Default Boiler not firing

    Hi all
    i would really like some advice please
    2 zone heating 1 upstairs 1 downstairs on an ideal combi boiler
    2 Honeywell cm707 programmable stats one for each valve
    wired to Honeywell junction box(wiring centre) as follows
    perm live from fused spur to term 1
    perm live from term 1 to boiler
    perm live to both stats in term 1
    perm live (grey) to both valves in term 1
    All neutrals in term 2
    all earths in term 3
    the stats have the perm live going in term A with the
    return term B out of stat (black) going to wiring centre in with brown upto valves
    orange from valve back to wiring centre with a grey going to boiler s/l
    each black from stat go into a separate terminal 4 and 6 with a brown from the valve

    when the stat is pumped up for heat the valves open but boiler does not fire is the wiring correct
    the valves are Drayton any help much appreciated thanks

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    Default Re: Boiler not firing

    Mr Swale of Swale Heating, currently taking a bashing on another forum?

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    Default Re: Boiler not firing

    Quote Originally Posted by rpm View Post
    Mr Swale of Swale Heating, currently taking a bashing on another forum?
    You're such a forum tart!!!

    I nearly joined swale about 18 years ago....
    Swale and Masood like this.
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    Default Re: Boiler not firing

    Use a tester to check power at necessary points. Simple s plan.
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    Default Re: Boiler not firing

    Quote Originally Posted by APPlumbing View Post
    You're such a forum tart!!!
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    Default Re: Boiler not firing

    Quote Originally Posted by rpm View Post
    Mr Swale of Swale Heating, currently taking a bashing on another forum?
    Hi Iam not mr swale Iam a new build installed trying to get my head round this 2 zone heating that contractors want in, never done it before, swale is the river next to me
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    Default Re: Boiler not firing

    Thanks for reply, 240v at both terminals 4-6
    240v at terminal 10 orange x 2 and s/l grey upto boiler
    240v at boiler perm live and switched live when stats are on

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    Default Re: Boiler not firing

    Quote Originally Posted by Swale View Post
    Hi all
    i would really like some advice please
    2 zone heating 1 upstairs 1 downstairs on an ideal combi boiler
    2 Honeywell cm707 programmable stats one for each valve
    wired to Honeywell junction box(wiring centre) as follows
    perm live from fused spur to term 1
    perm live from term 1 to boiler
    perm live to both stats in term 1
    perm live (grey) to both valves in term 1
    All neutrals in term 2
    all earths in term 3
    the stats have the perm live going in term A with the
    return term B out of stat (black) going to wiring centre in with brown upto valves
    orange from valve back to wiring centre with a grey going to boiler s/l
    each black from stat go into a separate terminal 4 and 6 with a brown from the valve

    when the stat is pumped up for heat the valves open but boiler does not fire is the wiring correct
    the valves are Drayton any help much appreciated thanks
    Quote Originally Posted by Swale View Post
    Thanks for reply, 240v at both terminals 4-6
    240v at terminal 10 orange x 2 and s/l grey upto boiler
    240v at boiler perm live and switched live when stats are on
    Sorry, I'm finding it hard to visualise what you're describing. A photo or diagram would be really helpful.

    Alternatively, take a look at the Honeywell website for a standard S-plan system which is what you're trying to configure. Follow the diagram and you won't go wrong. Terminal numbers and wire colours aren't that important, just follow the switching sequence..
    Last edited by Masood; 03-12-2016 at 08:19 PM.
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    Default Re: Boiler not firing

    Use multimeter not volt stick. If perm live and s/l going to boiler are both 240v. then, other than checking fuse on PCB, you will need GS engineer.

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