GEC Nightstor 100

[Bonedry]

My parents have had a GEC Nightstor for over 20 years and it has been a good system. Sadly the system was flushed out and after that there was banging from the pipes and it eventually cut out. They paid to have it flushed again and it worked for 11 days then same problem and nothing plumber could do.

Anyway I believe the heat exchanger has been blocked because of the flushing which was exited from a radiator and not the drain in the boiler.

I think if I turn of the valve next to the pump and open the drain in the boiler compartment and flush from the header tank this may clear the heat exchanger. Has anyone done this or had a similar problem.

There are two radiator circuits upstairs and downstairs (under the floor in concrete). I think the water is boiling so the pipes bang and the thermal trips cut off the fan.

The pump is on position 3 and another issue may be the pump is not pumping enough? Thanks to Mike the boilerman for ringing me back and leaving a message - I wish he lived closer!

Thanks for any advice etc

John

 

[Bonedry]

Well I tried it yesterday and could only get a trickle of water flowing through so no luck really. I thought there might be enough pressure from the header tank to flush out the heat exchanger.

I'll try and add some pictures and diagrams later.

Cheers

John

 

[Agile]

It seems your power flushing man was not very good at it!

Withoug seeing your system I cannot really comment on your problem.

Assuming you mean Mike Bryant, he does not normally look at the forum as far as I know. But he does like to specialise in those kind of systems.

Tony

 

[Bonedry]

Tony

I cannot comment on the plumber he was a friend of my father. Sadly my father passed away in January and I was hoping to get this fixed until we can replace the system with storage radiators.

There are three 22m pipes into the boiler flow, return and vent. the vent (I think) has a 15mm tee to the header tank. The pipes go into the heat exchanger above the pump.

We have now paid plumber twice Hyndburn Engineering once (stated boiler OK its the wet system) so if I get someone else in want to be sure they know what they are doing. I was hoping someone may have had and fixed a similar problem.

Yes is was Mike Bryant and I was so annoyed I missed his call but he left a long message with some suggestions but the distance is really to far. His website is a useful resource and he sounds a real gentleman.


Here some pictures

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• 11 Feb 2013
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Cheers

John

 

[Agile]

Mike is reluctant to go as far as the other side of Reading!

Unfortunately its impossible to guess at the inside of pipework from looking at the outside.

I often encounter people who have paid out a lot of money to people who have not effected a proper repair. They then dont want to pay me a reasonable amount to correct the problem for them.

So I largely stay clear of people who have been ripped off by incompetent or cowboy people.

Tony

 

[joe0208]

I have a similar problem of changing some radiators myself and having the system run fine for a a couple of weeks before throwing a wobbler. There are loud bangs and then something trips. I'm pushing in what I believe to be a reset switch and that gets her going but only for a few mins before a repeat performance. I wasn't sure is it possible I may have air locked the system and I am reluctant to get rid of it as it has fared me so well so far for the last couple of years since moving in. I can see 3 turnable valves of somesort within the bottom of the unit. Does anyone have any idea what maybe the best approach for me to investigate myself before having to get anyone involved? Your help is much appreciated.

Kind regards
Joe