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Help with installing new room thermostat!

buyitall
buyitall Posts: 3,597 Forumite
Part of the Furniture 1,000 Posts Combo Breaker
in In my home (includes DIY) MoneySaving
Hi, we are in the process of replacing an old slider-style room thermostat with a digital one (Honeywell DT90E). We have replaced it and wired it in, but it seems to be having no effect at all on the central heating! The heating just carries on working at full blast even though the current temperature shows as being much higher than the temperature it is set for. Any ideas? Thanks for any advice :)

Comments

  • I_have_spoken
    I_have_spoken Posts: 5,051 Forumite
    edited 1 October 2013 at 9:50PM
    Not wired correctly? Is the heating demand 'flame' icon on all the time?

    Have you connected the switched live out to 'C' rather than 'B'? Maybe stuck solenoid is keeping 'B' energised...
  • buyitall
    buyitall Posts: 3,597 Forumite
    Part of the Furniture 1,000 Posts Combo Breaker
    Having tried various wiring permutations, and I think we have fixed it now. Still not convinced that the temperature in my house is currently 26 degrees, which is what the thermostat says it is, but that's another story - will monitor over the next few days. Thanks for your advice :)
  • keystone
    keystone Posts: 10,916 Forumite
    What was the make/model you replaced?

    Cheers
    The difference between genius and stupidity is that genius has it's limits. - Einstein
  • buyitall
    buyitall Posts: 3,597 Forumite
    Part of the Furniture 1,000 Posts Combo Breaker
    Was a v old Honeywell, not sure of model.
  • keystone
    keystone Posts: 10,916 Forumite
    Do you mean like this:

    1769293_300.jpg

    Cheers:
    The difference between genius and stupidity is that genius has it's limits. - Einstein
  • buyitall
    buyitall Posts: 3,597 Forumite
    Part of the Furniture 1,000 Posts Combo Breaker
    No, was a square-ish box, similar in size to the DT90E, with a sliding lever going across the bottom.No other control apart from the lever.
  • keystone
    keystone Posts: 10,916 Forumite
    thermostat-old.jpg

    Honeywell-ST699-24-Hour-Programmer_medium.jpg

    Either any closer?

    Cheers
    The difference between genius and stupidity is that genius has it's limits. - Einstein
  • buyitall
    buyitall Posts: 3,597 Forumite
    Part of the Furniture 1,000 Posts Combo Breaker
    No, can't see a photo online, will have a look at the unit when I get home from work this evening.
  • keystone
    keystone Posts: 10,916 Forumite
    Its just a case of making sure that the wiring for the old one is the same or different than the new one.

    Cheers
    The difference between genius and stupidity is that genius has it's limits. - Einstein
This discussion has been closed.
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