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Just to complete this topic, I finally traced the fault down to a sticking microswitch in the MV in the HW circuit. I disconnected it, and it now works fine on the CH side. Now just the MV to sort out .. Thanks to those that responded.

Thanks, guys. I'll have a look at the DIP switches, but nothing in the boiler has been changed since it was installed. I did try switching everything off for 30 mins or so, and then restarting, but that didn't make any difference. Is the frost stat. a separate item - could that be faulty ?

Hi I have a Glow-worm 18HXI installed in the garage, which is a 'lean-to' on the house. For over a week now, in non-timed periods, the boiler fires intermittently for about 10 seconds, and the pump has been running continuously. I suspect this is the on-board frost protection kicking in, as...

Thanks for the thoughts. The Glow-worm installation leaflet, though, specifically shows BOILER - EXPANSION - FEED - PUMP in that order, as does the Myson leaflet for the kick-space heater. Are they both wrong ?

Hi I wonder if anybody can throw light on my little problem: I have a conventional vented fully-pumped CH/HW system, using a Glow-Worm 18hxi, 2 motorised valves and Honeywell Auto by-pass valve. The layout is generally as the image. The boiler is wall-mounted on the ground floor, all of...

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