I have the above boiler with a fault i've not seen before and wondered if someone could offer some of their experience of these ,
the boiler is around 10 years old vailant ecomax, the homeowners handyman had drained the system to remove two upstairs rads for decorating purposes, since these have been refitted and filled a fault on hw has appeared.
when running hot water the boiler fires as normal but within ten seconds the primary temperature starts rocketing towards 80+ and the noise of the boiler becomes very loud, like the fan/h/ex are working overtime. it doesn't sound like normal kettling but definitely appears to be coming from the main heat exchanger. the plate h/ex is clear and is less than a year old, and the main heat exchanger was changed around 4 years ago.
It seems as though something must be restricting the proper flow around the boiler possibly when hw is on but when the heating is on the noise is normal. may I add the water temperature at the tap stays fairly consistent aswell
thanks
(PS i've heard of occasions on these where the rubber hose on the flow/return in the boiler can begin to block causing circulation problems, could this be a cause, or would that also cause this noise on heating )
the boiler is around 10 years old vailant ecomax, the homeowners handyman had drained the system to remove two upstairs rads for decorating purposes, since these have been refitted and filled a fault on hw has appeared.
when running hot water the boiler fires as normal but within ten seconds the primary temperature starts rocketing towards 80+ and the noise of the boiler becomes very loud, like the fan/h/ex are working overtime. it doesn't sound like normal kettling but definitely appears to be coming from the main heat exchanger. the plate h/ex is clear and is less than a year old, and the main heat exchanger was changed around 4 years ago.
It seems as though something must be restricting the proper flow around the boiler possibly when hw is on but when the heating is on the noise is normal. may I add the water temperature at the tap stays fairly consistent aswell
thanks
(PS i've heard of occasions on these where the rubber hose on the flow/return in the boiler can begin to block causing circulation problems, could this be a cause, or would that also cause this noise on heating )
