Old system, scalding water from tank.

[shmelv]

Morning guys,

Quick query which im sure someone will easily resolve.

A friend has just moved house and inherited an old central heating system and has a problem with scalding water.
(he is having it all serviced next weekend)

the system has a glowworm fuelsaver boiler which is set to come on in the morning and evening on hot water and heating. The room stat is curently turned down to 10 and is not coming on obviously due to tempersature.

The system has Two pumps wired into it one running for hot water and one obviously for central heating. But NO valves. ( i am unfamiliar with these sytems)

The cylinder stat is a fairly old one with a dial set to 60 degrees, However after the boiler running for an hour or so the hot water from the taps is almost scalding, he has tried turning the stat down and confirmed he hears NO click.

Im assuming this is more than likely the cylinder stat faulty, not telling the boiler to turn off when it reaches temperature.

any insight into the fault and this system would be appreciated

 

[John506]

I would also start at the cylinder stat, replace it and see how it goes

 

[expertgasman]

I would also start at the cylinder stat, replace it and see how it goes

Then change this, then change that, ad infinitum...............

It does sound like the CS, but they are simple to test.

 

[twgas]

try turning the boiler 'stat right down, (to min not off) this wont rectify the fault but it should reduce the hot water temp a bit.

 

[Onetap]

Is there an electric immersion heater element firtted in the top of the hot water storage cylinder? If so, then turn it off or remove the fuse to see if that was the problem.

 

[expertgasman]

try turning the boiler 'stat right down, (to min not off) this wont rectify the fault but it should reduce the hot water temp a bit.

Not neccesarilly, and probably not, according to the description i the OP



Onetap Posted: Sat Jun 18, 2011 11:27 pm

Is there an electric immersion heater element firtted in the top of the hot water storage cylinder? If so, then turn it off or remove the fuse to see if that was the problem.


Clearly the best starting point.

 

[twgas]

OK, perhaps I ought to have said "might" instead of "should".
Bearing in mind this appears to be a DIYer help a mate it is quite possible it will take some time so I suggested this as a "hope this helps" temporary measure.