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Radiator's wont turn off - Danfoss TP5000si Room Thermostat

Discussion in 'Plumbing and Central Heating' started by Mr Moashie, 25 Feb 2017.

  1. Mr Moashie

    Mr Moashie

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    Hi,

    I've recently moved into a new property with a Ideal Logic 15 Boiler and Danfoss Heating Controls (around 4 years old). The main control unit is in the utility room and controls the hot water and heating throughout the house however, I have a room thermostat programmer (Danfoss TP5000) in my living room.

    I've had no problems over the past 3 weeks however when I woke up this morning and went into the living room the temperature was 28 degrees and it should have been 20 degrees.

    Essentially the radiators wont switch off no matter what setting I put on the thermostat. If I decrease the temp setting on the Danfoss controller nothing happens, if I increase to over the current temperature say 30 degrees, the little flame icon displays on the screen as if it is turning the radiators on (however they are already on!!)

    I've tried resetting the room controller - doesnt work
    Ive tried resetting the boiler - doesnt work

    The only way to turn the radiators off is to switch the boiler off!

    Oh - the radiators do not have the valves on them also.

    Can anyone help?

    Many thanks
     
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  3. D_Hailsham

    D_Hailsham

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    You obviously have a hot water cylinder - right?

    Do you have one motorized valve (usually near the cylinder) like this:

    or two like this:
     
  4. Mr Moashie

    Mr Moashie

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    Hi, thanks for the reply. I've taken a couple of photos.
     

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  5. D_Hailsham

    D_Hailsham

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    Thanks for the pics (saves 1000 words!).

    I see three motorized valves (black and white boxes), which means you have one HW zone (pic 2, right valve) and two heating zones (pic 2, the two valves one above the other). The valves have a microswitch which turns the boiler on when the valve opens. The switch has probably stuck closed so the boiler lights even if the valve is closed.

    Do you have a multimeter (and know how to use it)?
     
  6. twgas

    twgas

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    I would suggest one of the valves is stuck open. If it was just the microswitch staying on the rads wouldn't be hot as the valves would be shut, preventing unwanted circulation.
    Do you have another room stat and are all the rads staying on?
     
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  8. Mr Moashie

    Mr Moashie

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    Erm, nope no multimeter I'm afraid
     
  9. Mr Moashie

    Mr Moashie

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    Hi, thanks for the reply. no I dont have another room stat.....
     
  10. JohnD

    JohnD

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    Not the wireless version, then?
     
  11. twgas

    twgas

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    What about the rads, do they all stay hot?
    Are both the pipes, to left of the valves, hot or just one or even neither?
     
  12. D_Hailsham

    D_Hailsham

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    Mr Moashie: An answer to the second question would be helpful.

    You said that the living room was 28C when it should have been 20C, but you didn't say what the bedroom temperatures were like. Were they also much higher than expected?
     
  13. DIYnot Local

    DIYnot Local

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