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Couple of photos of the offending items

Hi All, I noticed a burning smell coming from the power module in our caravan, when I've stripped it down, I've found that the neutral cable has started to melt / burn just as it connects to the RCD. The bottom of the RCD is also damaged. Firstly, what would cause this to happen...

After loads of messing around and bleeding of rads, I decided to turn the pump around.......................and hey presto, problem solved!!! Was almost certain that it was the correct way around in the first place, but there you go........

Well truning all the hot rads off didnt make any difference....the ones downstairs are still cold. Could this be just loads of air stuck in the system since it has been drained?

Just turned all the hot ones off, fingers crossed!

An update on my situation......................... I switched the heating on and opened up the drain valve on the rad down stairs. Eventually hot water started to come from the drain valve, so i left it draining for a while........hoping that any air would be moved out of the system and...

There isnt anything like that, that goes to the cylinder. Gonna try the pump the other way.................

Morning Kev.................. I am pretty confident that both pump valves are open, but i didnt find the cylinder vent. Could you explain what i am looking for and where it could be please... Another thing, when the heating is on for a while, the pipes that run to the radiator in the...

Hi Chris........... I am quite sure the pump is in the right way round..... I can bleed water out of all of the radiators...... When the water is being sent round the pump, it does seem a bit noisy, as if its full of air...if that makes sense

Thanks for all the help Kev.........time to sleep on it all now, probably be back in touch later. :)

I've not checked the head tank yet, thats a job for the morning I think.........Bleed the vent at the cylinder......whats exactly and where is that?

The pump is in vertical..... The pump was running when i took the screw off the front, and some water came out of there as well, but it was just a dribble.

So I did that bit right then! So i have turned the heating on full, without the water on........still no heat from any of the radiators. What now?????

The sunvic valves we mentioned i take it?

Its the SZ 1301, if that makes any difference...... How will I know if the pump is the right way round? If it is air, how do i solve this? Cheers for the help by the way!