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Mini S24 Radiators only get slightly warm.

  • 20-10-2015 6:25pm
    #1
    nc6000
    Registered Users, Registered Users 2 Posts: 3,406 ✭✭✭


    Hi,

    I've a Mini S24 boiler and since the coldish weather has returned I've noticed the radiators only get slightly warm, certainly not hot.

    It starts up fine and I can see the gas is being lit etc but regardless of how high I turn up the dial on the boiler or on the thermostat in the hall the temperature in the house doesn't really increase.

    All radiators both upstairs and downstairs get some level of heat and I've also bled them all. I can't say I noticed any hiss sound and no radiator is any hotter than the others.

    Pressure on the dial on the boiler is 1.5 Bar and the temperature on the other dial never gets above 40c.

    There is also a thermostatic valve in the hotpress which I've turned up and down etc but nothing seems to make any difference.

    Even now with the thermostat in the hall set to full and the dial on the boiler up full it's not continuously lighting the gas.

    Any ideas what could be wrong?


Comments

  • #2
    Dtp1979
    Registered Users, Registered Users 2 Posts: 12,870 ✭✭✭✭Dtp1979


    nc6000 wrote: »
    Hi,

    I've a Mini S24 boiler and since the coldish weather has returned I've noticed the radiators only get slightly warm, certainly not hot.

    It starts up fine and I can see the gas is being lit etc but regardless of how high I turn up the dial on the boiler or on the thermostat in the hall the temperature in the house doesn't really increase.

    All radiators both upstairs and downstairs get some level of heat and I've also bled them all. I can't say I noticed any hiss sound and no radiator is any hotter than the others.

    Pressure on the dial on the boiler is 1.5 Bar and the temperature on the other dial never gets above 40c.

    There is also a thermostatic valve in the hotpress which I've turned up and down etc but nothing seems to make any difference.

    Even now with the thermostat in the hall set to full and the dial on the boiler up full it's not continuously lighting the gas.

    Any ideas what could be wrong?

    Are the radiators cold on the bottom and warmer on top?


  • #3
    nc6000
    Registered Users, Registered Users 2 Posts: 3,406 ✭✭✭nc6000


    Dtp1979 wrote: »
    Are the radiators cold on the bottom and warmer on top?

    Hi. Yep, pretty much.


  • #4
    Dtp1979
    Registered Users, Registered Users 2 Posts: 12,870 ✭✭✭✭Dtp1979


    nc6000 wrote: »
    Hi. Yep, pretty much.

    Sounds like sludge to me but it's hard to know. What area are u based. Somebody might be able to reccomend to have a look


  • #5
    nc6000
    Registered Users, Registered Users 2 Posts: 3,406 ✭✭✭nc6000


    Dtp1979 wrote: »
    Sounds like sludge to me but it's hard to know. What area are u based. Somebody might be able to reccomend to have a look

    Would sludge not be a gradual thing?

    I think this change in how hot the radiators were getting happened fairly suddenly.


  • #6
    DGOBS
    Hosted Moderators Posts: 3,496 ✭✭✭DGOBS


    Have a look in the flame viewing window as soon as the boiler lights, watch over 1 minute or so as the flame should increase in size, then does it quickly (over another minute or so) reduce back down to a small flame.

    If so, this would indicate a partial blockage in the heat exchanger (possibly due to sludge or limescale buildup)

    Whats happening is, as the boiler ramps up to full output, it sees a rapid buildup of temperature in the boiler (heat not getting away fast enough) so reduces the boiler output to a minimum, not enough to heat your entire system.


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