Big Bangs this morning on heating

[welsford46]

Hi Everyone

I have a 'old fashioned' heating system with boiler and tanks in the loft etc..

Central heating/HW came on as usual this morning...but after about an hour there were mega rumblings/banging from the pipework in the airing cupboard...couldn't work out what it was...

Went downstairs and turned the timer off..but the rumblings kept going for a while after. Thought I'd better have a look in the loft in case the expansion/overflow tank had run low or something? and it was very hot...so I suspect the system had been venting into the expansion tank.

What would cause this...is this the kettling people talk about?

Any idea how to locate the fault?

Thanks everyone

Welsford

 

[namsag]

Sounds very like your boiler stat has gone and boiler overheating

 

[gas4you]

How old is old fashioned? What boiler is it? I agree could be boiler stat failure. Banging in system can also be lack of circulation. Have you checked pump? Is it a fully pumped or gravity primary system?

 

[welsford46]

It's a Potterton CFL 60 Kingfisher..I think it's about 3 yrs old.

It's fully pumped.

Pump seems ok..it's whirring away.

I've played with the thermostats etc and turned the boiler one down a bit..seems to be ok at the moment..but something defo went adrift this morning

 

[gas4you]

It's a Potterton CFL 60 Kingfisher..I think it's about 3 yrs old.

It's fully pumped.

Pump seems ok..it's whirring away.

I've played with the thermostats etc and turned the boiler one down a bit..seems to be ok at the moment..but something defo went adrift this morning

This boiler has a pump over run built in which will keep the pump running for about 5 mins after the call for heat/boiler goes off. The pump is controlled by the boiler. That is why it kept rumbling after you switched it off. This boiler also has a overheat stat which if operates in case of thermostat failure will lock out boiler and the red light will come on at the front and you have to reset it.

A pump that appears to be spinning is not guaranteed to be actually circulating!! I've learn't that the hard way in the past!

Do you have a by-pass valve fitted in your pipe work in the correct position?

I still suspect flow problems or knowing Potterton it could be PCB control problems as with th rogue Suprima boiler

 

[welsford46]

It seems to be working ok at the moment...maybe I'll get a rude awakening in the morning.

The boiler is going to be replaced later in the year as part of an extension to the kitchen...so I don't want to spend loads on it.

There does seem to be a tap coming from the boiler about every 2 secs when it's firing..not sure if that is sinister.

So is an intermittent problem likely to be the boiler stat/thermistor.

Sorry I don't know if there's a bypass on the system

Thanks

Welsford

 

[gas4you]

Even if the boiler stat has gone, in theory the overheat stat should cut the boiler out

 

[welsford46]

Even if the boiler stat has gone, in theory the overheat stat should cut the boiler out

oooo you're local!!!!!!

Naaarich here too

 

[gas4you]

how boooootiful!