Have glow -worm boiler 12 years old regularly serviced ( 12 monthly ) fitted with new pump about two years ago (grundfos 25-50).
Problem, yesterday some downstairs rad were luke warm so I turned off upstairs and then all downstairs got hot ( fine ) but noticed one of upstairs rads went cold.
Today I switched off all rads except the cold one upstairs and turned on system - knocking sound etc .
Opened up all rads agAin but only upstair hot (except the same one upstairs problem rad).Decided to repeat yesterday exercise so I turned off all upstairs again to get downstairs working.Now they will not work!!!.Pressure gauge was originally at about 0.7bar , yesterday now dropped to 0.5 bar.
Boiler kicks in , gas burner is lit for about about 1 minute then cut off.Have I a Faulty pump - surly not after 2 years ...
Any help would be appreciated ..
madhatter
Problem, yesterday some downstairs rad were luke warm so I turned off upstairs and then all downstairs got hot ( fine ) but noticed one of upstairs rads went cold.
Today I switched off all rads except the cold one upstairs and turned on system - knocking sound etc .
Opened up all rads agAin but only upstair hot (except the same one upstairs problem rad).Decided to repeat yesterday exercise so I turned off all upstairs again to get downstairs working.Now they will not work!!!.Pressure gauge was originally at about 0.7bar , yesterday now dropped to 0.5 bar.
Boiler kicks in , gas burner is lit for about about 1 minute then cut off.Have I a Faulty pump - surly not after 2 years ...
Any help would be appreciated ..
madhatter