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Grant 50/90 Riello RDB not working

Discuss Grant 50/90 Riello RDB not working at UK Plumbers Forums; I have a problem with my Grant 50/90 oil boiler and Riello RDB burner.( located in garden in cabin pac ) Nothing is happening at the boiler !! The timeclock ...
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    Default Grant 50/90 Riello RDB not working

    I have a problem with my Grant 50/90 oil boiler and Riello RDB burner.( located in garden in cabin pac ) Nothing is happening at the boiler !! The timeclock is on, the pump is running, 0.5 - 1.0 bar system pressure, room stat calling for heat and motorised valve open for heating. Boiler is not locked out, overheat stat has not tripped out but nothing happening ? Any ideas ?

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    Default Re: Grant 50/90 Riello RDB not working

    Check for power at boiler.
    Overheat stat reset. Press red button.

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    Default Re: Grant 50/90 Riello RDB not working

    Hi tipintim, power at the boiler and overheat stat has not tripped !

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    Default Re: Grant 50/90 Riello RDB not working

    Frost stat?
    Something is not calling for heat. Check wireing.
    Last edited by tipintim; 26-11-2011 at 02:41 PM.

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    Default Re: Grant 50/90 Riello RDB not working

    No frost stat fitted but I was wondering if it could be the actual boiler stat ? Would this always lock out if there was a fault or could it just stop calling for heat ??

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    Default Re: Grant 50/90 Riello RDB not working

    If the burner has locked out there will be a light on the lockout button on burner. If this is not the case there may be a fault in the thermostats. It is possible to have a faulty control box on burner, that shows no red light, but this is rare. Have the power to burner checked first.

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    Default Re: Grant 50/90 Riello RDB not working

    Quote Originally Posted by MJPH View Post
    No frost stat fitted but I was wondering if it could be the actual boiler stat ? Would this always lock out if there was a fault or could it just stop calling for heat ??
    The main, control stat if failed, would let the boiler overheat & then the limit stat would limit the temp by turning off permanately. It is only resettable manually by the limit reset button. ( some limit stats are automatic types, that reset when temp lowers, but normally not)

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    On your stat at boiler there will be a small plastic screw cover once taken off there is a small button try and press it in
    GSR? Want gas safety or boiler repair advice? We will check out that you're genuine via the gas safe website, so please dont be offended when we ask for your details. DIYers, odd job people and have a go heroes need not apply.

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    Default Re: Grant 50/90 Riello RDB not working

    Hi Gray0689 Please see from original post : Nothing is happening at the boiler !! The timeclock is on, the pump is running, 0.5 - 1.0 bar system pressure, room stat calling for heat and motorised valve open for heating. Boiler is not locked out, overheat stat has not tripped out but nothing happening ? I think it must be a control issue as it seems like the boiler is not being called for heat !!!

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    Default Re: Grant 50/90 Riello RDB not working

    Hit the test switch and see what happens. If nothing there is no permanent live going to the boiler.

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    Default Re: Grant 50/90 Riello RDB not working

    Can you hear a slight humming or buzzing noise from the boiler, check to see if you have a live supply to the burner.Something may have seized such as the pump or motor or even the capacitor might not be generating enough power to start the motor, this is usually accompanied by a buzzing noise.

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    Default Re: Grant 50/90 Riello RDB not working

    As the water pump is running, the burner should be getting power. Check limit stat as has been said by a lot of us, & if power is getting to burner, then control box is likely if no lockout.

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