Glow Worm 30 CXI radiators get hot with no demand and CH swithed off

[trokey]

Any help would be very much appreciated

Glow Worm 30 CXI central heating comes on with no demand from thermostat and even remains on when cenral heating is switched off - I have had to turn power off to stop it - No fault code displayed - also the radiators get warm when hot water is used when i have managed to temporarily switch the boiler back on without constant heating (then in middle of night came on again by itself) ?

 

[aggis]

Hi, sounds like the motorised valve is staying open, letting water pass into heating, therefore rads get hot when taps tuned on, & when boiler calls for hot water preheat. You probaly notice you hot water isn't as hot.

 

[trokey]

Thanks for your diagnosis- much appreciated-yes water only gets really hot when tap only half on - can the motorised valved be excersised and work again or is it best to just replace it?and is it an easy replacement or am i best calling a plumber

 

[aggis]

It's best to get a Gas Safe Engineer who specialises in service & repairs.

 

[jamesem]

Hi trokey, did you manage to fix your glowworm , ive just had the same thing happen to our boiler, I installed it 5 yrs ago and its been great up to now, but same symptoms as yours.
Was it the motorized valve?
Thanks, james

 

[wazzer]

People ask questions you try to help them but they rarely get back on and let you know the end result its ignorant