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Do you mean isolation valves either side of the pump? No I don't think there are any - well I certainly didn't use any if they are there, just lots of towels that ended up very wet :confused:

Final update time! The new pump arrived (Ian I took your advice and got a new one), and it’s now fitted. That was definitely the source of all the original problems (not just the not firing) so it’s all behaving perfectly. Thank you so much for all the help, I wouldn’t have got to the end...

You're (of course) right that the pump is a Grundfos 15-60. It's specifically labelled as a UPS 15-60x18. All the ones on eBay seem to have "130" at the end (UPS 15-60x18 130) - what does that 130 relate to? Do you think one like this be compatible with what I need please...

Thanks Ian! This afternoon I've had the pump out and it appears to be dead. As its not seized I'm wondering if its the starter capacitor that has gone but it might be more hassle trying to find and fit a new one of those than to just get a new pump head - assuming that I can find the right one...

Thanks Oilhead. Running the tap doesn’t cause the burner to come on (even if the thermal trip hasn’t tripped) so nothing gets hot. A few tests show that the diverter valve actuator is moving correctly and the piston on the valve seems to be moving freely (not sure about the internals though)...

Sorry I missed your initial comment on the type of diverter - you are exactly right it is the one with a plastic head and an up and down lever on the side. Is there a way that I can frig the valve to check if this is the cause. Maybe take the actuator off, push down the plunger and then try...

Thanks. Do you think it’s likely to be within the diverted valve and therefore linked to the other symptoms? I checked the voltage at the flow switch and it changes between 240V and 0V depending if the hot tap is on of off. So I think that’s working ok.

I'll try to stop posting updates but I just went in to the kitchen to find that it was happily firing away (in the normal way of keeping itself up to temperature). So I guess that the issue is that it can't tell that I'm demanding heat in either way. Hopefully that might help with some diagnosis.

Status update: I don't think it is overheat tripping out as it hasn't done that again. When I reset it the burner started up fine, so I don't think the burner is the issue. But notably it is not trying to fire and the burner motor is not running when running hot water, turning up room thermostat...

Thanks for the quick replies! I’ve pressed the overheat thermostat reset button and the burner did fire up but has tripped again. The pressure on the dial is reading fine at 1.5bar. So it seems like there are two problems to deal with unless the flow switch could also cause this overheat tripping?

Hi folks, I've got a Worcester Heatslave 20/25 oil-fire boiler with issues! Recently its been causing problems and today seems to have given up trying! Here is the story of the symptoms so far: - When running a hot tap it would give hot water for a few seconds and then go cold for maybe another...

I'm really just inquisitive, I would never ever put my wife's or my own life in danger by doing something I wasn't safe to do. From here (//www.diynot.com/forums/viewtopic.php?t=82687) I was under the impression that it is safe for consumers to plug or unplug a bayonet connector for a...

so would I be able to change the micropoint hose on the newer cooker for a standard bayonet hose without any problems?

I can vouch for the oven as its from a family member. I've looked at some new cookers online and none of them say whether they use a bayonet connector or a micropoint connector so if I were to get a new one how would i ensure that the socket doesn't need to be changed? It seems crazy that...

Hi I'm looking at getting a new gas cooker to replace my old one. The old one is connected to the wall using a bayonet hose. The one I'm looking at getting (2nd hand) has got a micropoint hose. Are there adaptors to connect these two (micropoint hose into a bayonet socket)? Or is my fitter...