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Hi all,
Advice appreciated. I drained down a 13 rad open vented heating system today to replace all the TRVs on the ground floor. Obvious signs of corrosion in the system (header tank full of brown water).
Changed TRVs, on trying to fill the system realised that no water was coming in from the header tank (couldn't bleed any radiators at all). So I am thinking blocked cold feed.
After a bit of pipework alteration in the loft, connected the mains connection to the F/E ballvalve to the open vent pipe and carefully filled the system with mains pressure water down the open vent pipe, stopping to bleed all radiators. Eventually managed to fill all radiators.
Turned on the boiler and pump (having also set the 2 control valves to manual and bleeding the hot water indirect circuit) and the radiators are all getting hot, great news.
After about 10 minutes, boiling water starts spilling over into the F/E tank from the open vent (spurting out every 20 seconds or so).
Is this likely to be due to the blocked cold feed (which I'm looking to fix tomorrow) or is there something else afoot?
The boiler is about 15 years old and is an old floor-standing boiler. Grunfos pump which seems to be filled with water rather than air.
Any thoughts appreciated!
Advice appreciated. I drained down a 13 rad open vented heating system today to replace all the TRVs on the ground floor. Obvious signs of corrosion in the system (header tank full of brown water).
Changed TRVs, on trying to fill the system realised that no water was coming in from the header tank (couldn't bleed any radiators at all). So I am thinking blocked cold feed.
After a bit of pipework alteration in the loft, connected the mains connection to the F/E ballvalve to the open vent pipe and carefully filled the system with mains pressure water down the open vent pipe, stopping to bleed all radiators. Eventually managed to fill all radiators.
Turned on the boiler and pump (having also set the 2 control valves to manual and bleeding the hot water indirect circuit) and the radiators are all getting hot, great news.
After about 10 minutes, boiling water starts spilling over into the F/E tank from the open vent (spurting out every 20 seconds or so).
Is this likely to be due to the blocked cold feed (which I'm looking to fix tomorrow) or is there something else afoot?
The boiler is about 15 years old and is an old floor-standing boiler. Grunfos pump which seems to be filled with water rather than air.
Any thoughts appreciated!