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TRV radiators not controlled by heating timer

Discussion in 'Plumbing and Central Heating' started by Fumblina, 22 Jan 2021.

  1. Fumblina

    Fumblina

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    We have just moved into a new house (not new build just new to us) and the heating system seems a mess, or we just are not using it correctly.

    There is an Ideal Logic+ boiler providing central heating and hot water via a tank. All the downstairs radiators apart from the hall have TRVs on and we think should be controlled (along with the hot water) by the program box next to the boiler - no temperature settings just on/off times.

    The problem is that the downstairs rads never switch off. Well we can turn them off with the valve, but whatever temperature they are set to they maintain that day and night. We had a heating engineer come out and told us that we need to replace all the valves.

    He said that a broken valve would send a demand for heating to the boiler causing it to be running 24/7. I'm happy to be proven wrong but I'm calling bullshit on that. Surely if the timer control was working then it shouldn't matter how cold the radiator got it should not switch on during the 'off' time?

    He has also told us that the loud noise our boiler makes (all night long as the rads don't switch off!) is perfectly normal and the fan on many Ideal boilers does this, whereas I have seen that Logic+ have been certified QuietMark and I've seen reports they are among the quietest on the market.

    (There are separate controls for the upstairs radiators - no TRVs, the thermostat is in the bad place but does work, the timer works fine and neither of the timer devices has any effect on the downstairs rads.)

    Any advice please - not feeling confident about the advice we have been given but don't want to spend another £100 on another call out for a second opinion if he is right.
     
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  3. Chris_W

    Chris_W

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    Firstly I’d be checking the motorised valve, as this would be sending a signal to be on, not the trv. These have an end switch that when activated send power to the pump and boiler to fire up.
     
    Last edited: 22 Jan 2021
  4. terryplumb

    terryplumb

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    What valves are on your downstairs rads ,post pics please. Do you have two timers for up and downstairs zones ?
     
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  5. ianmcd

    ianmcd

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    As @terryplumb says post pics of which TRVs you have some are connected by WIFI and tell the boiler when to come on, unlikely in your case just sounds like your so called heating engineer hasnt a clue
     
  6. Fumblina

    Fumblina

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    @Chris_W where would the motorised valve be? Is it part of the boiler?

    There is a Siemens RWB9 programmer next to the boiler https://assets.new.siemens.com/siem...d0124154b347f13fb3bc193b98/rwb9-datasheet.pdf
    This may control the hot water and does not control the upstairs radiators.

    There is a Siemens Landis & Staefa thermostat in the hall which controls the temperature of the upstairs rads and looks like this https://www.dhsspares.co.uk/product/siemans-raa21-gb-thermostat-4190020
    And a Siemens L&S RDE10.1 programmer in the living room that controls when the upstairs rads come on https://www.wolseley.co.uk/product/siemens-rde101-7-day-programmable-room-thermostat/ - this is not the version that controls hot water and is just heating only.
     
    Last edited by a moderator: 23 Jan 2021
  7. Chris_W

    Chris_W

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    Valve(s) usually where the hot water tank is, sounds like you have zoned heating.

    A bit like one of these: upload_2021-1-23_14-21-9.jpeg
     
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  8. Fumblina

    Fumblina

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  9. ianmcd

    ianmcd

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    Are you sure he didnt say a faulty zone valve ? your TRVs couldnt cause your fault
     
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  11. Fumblina

    Fumblina

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    @ianmcd yes he def said the radiator valves as he was saying we needed to replace them all. If he had meant zone valves surely we would only need to replace one as the upstairs and hot water are ok.
    I will double check once we get the quote for the work from him though, thanks.
     
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  12. ianmcd

    ianmcd

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    Changing the TRVs will do absolutely nothing
     
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  13. 45yearsagasman

    45yearsagasman

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    Apart from relieving you of a lot of money.:D
     
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  14. Fumblina

    Fumblina

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    @Chris_W This is my airing cupboard, what I think is the zone valve and the back of it showing the switch.
    Is the switch in the right place? Thanks
     
  15. Chris_W

    Chris_W

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    I think your heating valves are the Siemens ones below, the switch is inside the valve, and it’s not always possible to know by looking at the lever as not all of them move.
     
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  16. Fumblina

    Fumblina

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    Ah, so one for the hot water (honeywell) and two siemens - one for each zone of heating. That makes sense! Thank you.
     
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  17. Chris_W

    Chris_W

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    Yep, got it. Now to figure out if one is keeping open. Try moving the lever/slider for any resistance.
     
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