glow worm swiftflow 100 combi boiler problems All aspects of plumbing questions and answers, help, tips and information

[gazkelly]

Hi, can anyone help me. I have a glow worm swiftflow 100 combi boiler and I cannot get hot water unless I have the heating on, also when the hot water is running I have to keep it to not much more than a trickle or it begins to run cold.
Any help with this would be much appreciated.
Thanks

[htg engineer]

Gas pressures or diverter fault, possibly split or stretched diaphragm. When the hot tap is running, hold the CH flow - does it get hot ?

htg

[Steve the gas]

Also possible scale build up in HEX