Worcester Greenstar 42CDI - no pressure! (overflow pipe leaking)

[WetWilly]

Hi,

My parents boiler has a problem.

It is a Worcester Greenstar 42CDI.

Around 1 week ago we noticed the boiler had low pressure when in use (central heating). The pressure gauge was in the red, below 1.

We filled when off (cold) so pressure was between 1 and 1.5 as per manual.

Last night they noticed the radiators making a whooshing noise. The pressure on the boiler was at zero, when on.

The overflow pipe outside (not the condensate pipe), the little overflow pipe was spewing water onto the floor.

Immediately turned off boiler.

Questions;

- what is this?
- the company they are with are not taking calls now due to covid, can they do anything themselves?
- is it safe to use with zero pressure? Central heating or hot water.
- filling up the boiler again, the pressure goes back to zero after a short while, even when the boiler not in use.

Obviously a difficult position as they are elderly and with covid, getting someone out is a bit of a problem. So a bit of a panic really since the weather is now excessively cold. Any advice appreciated. Thanks.

 

[terryplumb]

The pressure relief valve has lifted ,for whatever reason ,and is allowing water out the pipe outside.

 

[WetWilly]

Thanks Terry. Is that something I can shut myself?

 

[terryplumb]

Sometimes ,if you operate it manually a few times it may close . More often it needs replacing . The cause of it opening needs to be addressed however.
You really need an engineer.
If the boiler still fires for central heating ,you can still use it rather than your folks perishing ,until an engineer can attend.

 

[jj4091]

You will probably have something like this

in your boiler. If you turn it till it locks back in place you may find it cures the problem.

 

[WetWilly]

Thank you guys. Refilled this morning and no drip, pressure going up as normal when on. Seems to be working as normal. Maybe the pressure relief valve has corrected itself.

But I think maybe get Bosch out to service and look at, take no chances. Unfortunately missed the service last year due to Covid, but still in warranty for another 4 years so should get a reduce call out rate I think.

 

[ianmcd]

If you get Worcester to service it, they will reinstate the warranty, think it is about £129 for everything all materials and labour, an Independent wont be able to reinstate the warranty for you

 

[WetWilly]

If you get Worcester to service it, they will reinstate the warranty, think it is about £129 for everything all materials and labour, an Independent wont be able to reinstate the warranty for you

£240 with the warranty reinstated it was.

It's actually been working fine all day though to be honest.

 

[WetWilly]

So the engineers came out. Nice chap. Though hated having someone in the home at this time.

Replaced two valves, some gaskets, and pumped up the pressure in the err...big metal pressure thingy. He said the pressure was only a little bit low but lower than it should be.

Anyway, back in warranty now and working great. £240 down, but needs must.