Hi -testing my sanity here -
Potterton Profile 80E - Circa 16 years
Three floor house
11 Rads
Most Rads with TRV
Fully Pumped S plan with cold feed close coupled on air separator behind the pump
About 2 weeks ago, central heating downstairs started to be noticeably cooler - getting worse by the day - upstairs OK. Boiler cycling more than it should and some kettling.
My thoughts
Is it sludge - There is a Magnaclean installed but its a three floor house and the Pump and Magnaclean are on the 1st floor so. Loaded the system with Sentinel X800 for a couple of days and hired a Power flush. - Result boiler stopped cycling so much but still poor heating - some days none at all until all the rads turned off except one and then balance everything up again - even then sometimes I can only get ANY 8 of the 11 rads hot. I had a spare pump so changed that - no impact but the heating system seems to be making a lot of air - don't understand why as heating circuit is positive except for about 6 inches between air separator and the cold feed. With the close coupled expansion and cold feed I suppose the expansion could be negative? but its got about 10 feet of head and I can't believe its pulling air. Its London so hard water, could the problem be poor flow because of limescale in the heat exchanger or is is more likely a blockage in the return. If so is it worth trying to strip the heat exchanger out and chemical clean. What am I missing?
Potterton Profile 80E - Circa 16 years
Three floor house
11 Rads
Most Rads with TRV
Fully Pumped S plan with cold feed close coupled on air separator behind the pump
About 2 weeks ago, central heating downstairs started to be noticeably cooler - getting worse by the day - upstairs OK. Boiler cycling more than it should and some kettling.
My thoughts
Is it sludge - There is a Magnaclean installed but its a three floor house and the Pump and Magnaclean are on the 1st floor so. Loaded the system with Sentinel X800 for a couple of days and hired a Power flush. - Result boiler stopped cycling so much but still poor heating - some days none at all until all the rads turned off except one and then balance everything up again - even then sometimes I can only get ANY 8 of the 11 rads hot. I had a spare pump so changed that - no impact but the heating system seems to be making a lot of air - don't understand why as heating circuit is positive except for about 6 inches between air separator and the cold feed. With the close coupled expansion and cold feed I suppose the expansion could be negative? but its got about 10 feet of head and I can't believe its pulling air. Its London so hard water, could the problem be poor flow because of limescale in the heat exchanger or is is more likely a blockage in the return. If so is it worth trying to strip the heat exchanger out and chemical clean. What am I missing?
