Radiators cold and noisy popping sound when heating on

[blackjoe]

Hello All,

Your advice please!!

3 radiators cold downstair cold including feed pipe. The same upstairs 3 radiator cold too. The system is an oil feed system with expansion tank in the loft. When the system first switches on there is a popping/banging noise as-though there is air circulating. I had the oil boiler serviced in April and the engineer said he had noticed a noise and recommended at some point adding some Fernox MB1 if it bother us.

So approx 50% of the radiators, including the feed pipes in the house are cold and the system is noisey when first switched on.

I've tried bleeding the rads and water does flow. I checked the small tank in the loft (expansion tank??) does have water in it but it doesn't look great!

The heating has two zones (up and downstair), two blockages???

Cheers,

Mark

 

[seco services]

have you any rads that are hot ?
are they fitted with trv's ?
how long the problem been going on ?

 

[blackjoe]

have you any rads that are hot ?
are they fitted with trv's ?
how long the problem been going on ?

Thanks for the swift reply.

Yes, the other 50% are getting nice and hot.

Yes, all fitted with valves, and tried screwing them all the way in and out again and giving them a very light tap.

In the last couple of weeks. Since switching the system on for winter really.

 

[seco services]

take the trv tops off and check the brass pin is moving freely.

 

[Nige F]

ONLY PUSH the pin do not pull it up

 

[blackjoe]

ONLY PUSH the pin do not pull it up

Thanks for the advice.

Some further info.

It's the radiators furtherest area both up and downstairs that are affected.

The boiler seems to be cutting out prematurely (overheating) to get to working need to raise the internal boiler stat

I'm not convinced the pump is making the right noise.

The question:

Even though the pump is working, is it possible an internal pressure leak is present, causing poor circulation