Multifunction Control Overheat Reset Button on Part no 313980 at base of Glowworm Ultimate 40FF Central heating Boiler Serial Number of boiler 960029278 has tripped out 3 times in the last week. The boiler starts up straight away when I reset it then runs ok for a day or two? I am an electrician and have the boiler serviced Annually by a Corgi registered Central heating Engineer. Before I call anybody in can you suggest what the fault may be please?

Combi-boiler-turn hot water tap on/off and the heating stops for ...

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Combi-boiler-turn hot water tap on/off and the heating stops for 20secs ... hot watertakes priority over central heating so when you run the hot tap, heating is ... Yeah onmy worcester combi there is a diverter valve - it feeds either the heating or ...

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Overheat thermostat has tripped. If a modern Worcester need to press reset on control panel.

If older style Worcester - Pull front cover off the boiler (just above control panel flap pull the cover from both sides forward to unclip and then lift upwards to remove cover) and you will see a little brown reset button - press this back down.
However the over heat thermostat trips for a reason - was the system running on low pressure? It could be the pump is sticking a bit (dirt in the system) which can be sorted easily by adding an additive (DIY packs available at Home-base) . Or it could be the pump has completely gone. If this is the case it will trip again as soon as the boiler clicks back on.

Who is the maker of your boiler? Also, I need a model number so I can look up the info.

its the air pressure switch

thermostat yes is possable, thermocouple nothing to to do with water

overheat stat

Has the boiler cool down? Try turn the power off for a few minutes and see if that will work.

some times inside the boiler on the internal pipework you will see little sensors, on the central heating piping there sometimes is a thermastic sensor on side of flow pipe with a little reset button on ? i guess with the problem you said the poiler locked out and the pipe work overheated ? this is a safety feature on some boilers not, all and easerly reset via this button ?

Hi, perrycallow,
I'm Harvey the Master Plumber,

You want to know how to service a Glowworm compact boiler


Glowworm is a United Kingdom company and here is the information you asked me for, to get their technical service line:

Technical Help: 01773 828300
[email protected]

Thank You,
Harvey your Master Plumber.
Please give me a good rating before you sign off.

check the pilot line for an obstruction. check the millivolt generator that's supposed to keep the pilot valve open. check for a high limit control being bad.