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AS OIlman says "Who installed it?" By law, the only person who could install a domestic gas boiler is a CORGI registered person. There are no exceptions. The person who installed it is the right person to commission it. Anybody else installing, servicing or otherwise working on any gas...

Thanks, Oilman, for that link, I'm a potter as well as a plumber, so info on kiln burners is always of interest. Any modern domestic boiler is likely to use flame rectification. There are two spark electrodes often at opposite ends of the burner bar. If you listen as the burner lights, you@ll...

Pump Pump Pump..... If the pump is not running the boiler will be very noisy, may heat upstairs by thermo syphon. should eventually trip the overheat stat. check the pump is running. feeling hot is not proof, vibration is not proof. Switch system off, undo screw or plastic knob at centre of...

Gas boiler runs fan first, checks for positive pressure, enables spark, enables gas. If the flame lights, the clever bit starts... the flame conducts electricity, and has the interesting quirk of converting ac current to dc. (flame rectification, it's called). The control box is looking for the...

This problem may well originate elsewhere in the system, and the most likely source is a section of air filled pipe. I have had, and solved this problem on several occasions. If the stoptap is not fully open, the problem is likely to be solved by opening it. if this does not cure it, check the...

I agree. Check outside the house, there will be a pipe coming out behind and below the boiler- when the gauge goes to three, water will come out here. if so, the expansion vessel is at fault. it may be possible to pump it up again with air, or it may need to be replaced. It's definitely not a...