Hi all, got a Vaillant Ecotec 438 since 2009 and I never noticed this but it seems to be cutting off or short cycling. Had new rads fitted recently and when the flow is at 70 the return is now a measly 35!! Prior to the rad change a 70 flow = 46 return.
There are 11 rads in the house in total, all except 3 are type 22 and some are 1.6m long and one is 2m and the others are 1.4 and 1m long.
A magnaclean was fitted and within a week it was full! A chemical flush was attempted today but engineer said it needs a power flush as there might be some blockages in the pipe that are causing the huge gap in return temp and the boiler cutting off.
The boiler reaches 70c and then cuts off and then kicks in again within a minute rather stay continuously on. What else could be the issue for this?
I have attached a video. Also the tapping noise is me holding the cover.
Many thanks.
There are 11 rads in the house in total, all except 3 are type 22 and some are 1.6m long and one is 2m and the others are 1.4 and 1m long.
A magnaclean was fitted and within a week it was full! A chemical flush was attempted today but engineer said it needs a power flush as there might be some blockages in the pipe that are causing the huge gap in return temp and the boiler cutting off.
The boiler reaches 70c and then cuts off and then kicks in again within a minute rather stay continuously on. What else could be the issue for this?
I have attached a video. Also the tapping noise is me holding the cover.
Many thanks.