Booster pump installed successfully, but now boiler goes to overheat!

[deg]

Try sucking the vent pipe that goes over your small tank in roofspace. Or give it a good blow.

 

[Vitali]

That's a good suggestion, will try everything you say and if no joy, at least I tell to myself---I did all I could and then ring a professional... If you have more ideas, I am up all night working until morning, keep posting! Thank you everyone!

 

[GH77]

Turn on your central heating, does that work? ... did you turn off the valves to your central heating pump when you were working in the airing cupboard? ... i have seen people turn every valve off if they are not sure what is what...

 

[Old Account]

Did you install the pump the right way around ?

 

[Vitali]

I didn't go near the boiler in the first place, I just worked upstairs were the pipes and hot water cylinder is. Turned off 3 valves when installing the pump, was a very straightforward job, then turned back all of them back except for one by my stupid mistake, the one going to the bottom coil of the cylinder. And then when all overheat problems started I double checked and found this valve closed, which is open now but still the problem is there. Pump is installed right I suppose as the water pressure has increased nicely as described by manufacturer.

 

[Vitali]

The boiler starts as it should be: boiler on, fan on, pilot on, burner on. Can see fire burning, all good, but then stops and overheat light comes up and is there until everything cools down and I am able to reset it then.

 

[Old Account]

As mentioned few times before it either your Pump or one of the valves is closed, something restricts the flow therefore it overheats

 

[Vitali]

Can you tell me then what's a not working pump? I understand it is silent, not vibrating, nothing spinning. My one is the opposite and I even unscrewed the middle of it and the impeller is spinning. If some valves are faulty then they would be behaving faulty, never closing to firm end or opening to a full stop. Again the ones I have are working perfectly. I have all the rads switched off now as we need only hot water now. Will opening all rads and bleeding them help solve the issue?

 

[Old Account]

I think @ShaunCorbs has mentioned it earlier you will need an engineer to look at it.
It would be also greatly appreciated if you can let us know what the issue was

 

[Vitali]

Thanks, I will try to blow the pipes in the loft midday today as suggested, and if no luck, will bring a Pro in to solve the problems. Will write back how my saga finished later.