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It's Myson CP53.

I know it's a very late response but just for the sake of any future Googlers. It turned out to be a pump. I have called in another "gas man" and he replaced the pump. This time it worked. :D

I have tested at the pump terminals with the wires disconnected. Just to be clear, I actually don't get a reading when I check L and E. It just shows 1 as if I haven't touched anything with the multimeter probes.

There are no leaks anywhere.

Yes, I have double checked, it's 1ohm between L and E on the pump. I get about 0.4ohm when the meter probes connected together. It looks like I don't have 3Amp fuse anywhere so will have to go and get one before I can try connecting it to the mains. By the way, thank you very much for the...

Some but the plumber assured me that it's nothing to worry about and he's seen much worse. The water is not brown.

I don't think it was dry, because the pressure seems to be above 1bar. I can't imagine that there would be so much dirt/debris in the water for it to have no flow. I spoke to the plumber who replaced the pumps and he is just guessing now. He's got a theory that because a non original pump...

Two different makes were used (Grundfos and Bosch) and only the pump head was replaced by the plumber. Is this the one I need then? http://www.plumbclick.co.uk/circulating-pump-cp53.html For this price I am happy to give it a try.

It was Grundfos initially then two Bosch and the last one is Grundfos. I am not sure the pump was blowing the fuse. What else could it be, is there a way to test it?

I don't think the pump becomes hotter than the pipes beside it. Heating and hot water works ok. I didn't see what happened to the pump for the first two times (it just stopped turning and they were shortened out) but the third time I actually saw some smoke coming from the area where the wires...

I unplug the pump where the wire goes into it (L, N and E). Measured the resistance, between L and E I get 1. Between L and N I get 26.

Could it be a short circuit somewhere in the wires? Should I try to fit fast blow fuse instead? Is it possible that I burned three pumps by putting the time delay instead of quick blow fuse in and wouldn't the PCB itself burn before the pump? If I disconnect the pump then the boiler fires up ok...

The fuse packaging does not say F5a or T3a anywhere but it says "Time Delay 1.6A". And on the fuse itself it says T1.6AL250V

It's exactly like the one that was on the board and was working fine for at least 5 years (when I moved into the property). Maplin product code: GL61R. I can't link to the product directly but it's on this page: http://www.maplin.co.uk/20mm-glass-time-delay-t-fuses-452 Search for GL61R...

I got Sime Friendly Format 80E boiler which keeps blowing main PCB fuses and the pump. Few weeks ago the pump gave up the ghost and it looked like a simple fix so the plumber replaced the pump. The fuse on the main PCB was also blown which I thought was the result of the pump shortening...

Yes, I can see the clip coming out of the diaphragm section when I open the tap. I thought that the manifold section pushes the diaphragm section. Am I wrong or missing something here? I would think so. It did say "genuine replacement part" and it looks 100% identical. The water wasn't...

Sime friendly format e boiler. I have a problem with hot water. It used to take a lot of time until hot water reaches tap and the radiators used to become very hot when running hot water. I have assumed that this was the classic case of faulty diaphragm in the diverter valve so I have...

Hi, I have got a door lining kit and was going to fix it to the wall opening with these fixings: Link to B&Q I thought I would use up all 16 fixings. 8 on each side. A pair of fixings in four places on one side. Now the problem is that I think the wall is too thin. It's 8.5cm and this...

Thanks for quick response, bengasman. Do you think that a faulty diverter valve could cause the pump to make knocking noise? It feels like the pump isn't getting enough water for central heating and is pushing air instead.

Hi, How likely is it that a faulty boiler diverter valve causes the pump to make knocking noise? My radiators become hot even when the central heating is off so one plumber quoted £85 for the diverter valve + £250 labour. Is it reasonable? I have got Sime Friendly Format E...