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Thanks for the advice. Before I call the gas man,, can you expain why you think its the gas valve ? A few other threads point to problems with the solenoids. Is it worth changing the main burner solenoid ? What instruction does the gas valve get to go from low to high ? I looked at the...

Checked the tap (main & boiler) both are fine. Gas fire & hob are also fine. Checked electric supply. I get 4 neons, there is also 240V to the solenoid for the pilot & shortly afterwards to the main burner. I have a new pump on order, in case its very poor flow. anyone got any more...

Hi all, Could someone help diagnose this fault please. Fault - radiators take ages to get warm (can not get hot enough). Water taking a long time to warm up. System - glow worm 50FF boiler, conventional hot water tank, with header. 14 radiators - 10mm microbore pipe, 14 yrs old. I...