Greenstar 4000 combi consistently high pressure

[ademanuele]

I better not, may impact warranty.

From previous postings it may be that boiler just needs setting up correctly or valve may be leaking.

 

[John.g]

Is the relief valve dribbling constantly now if the pressure is ~ 2.8 bar.

 

[ShaunCorbs]

Call Worcester out for this week

 

[ademanuele]

Is the relief valve dribbling constantly now if the pressure is ~ 2.8 bar.

Not constantly but regularly, ground is always wet under exit pipe

 

[John.g]

Boiler PRV (relief valve) probably needs renewing as well, they should also add inhibitor as this has probably been going on since the boiler was installed.

 

[ademanuele]

I have contacted the installers. One final question, the house is taking much longer to get to temperature than the boiler it replaced. The boiler seems to turn itself off periodically and I can hear it making gentle clicking sounds. Is it switching itself off due to the high pressure or do condensing boilers take longer to get to temperature? This boiler has a higher rating (30kW) than the one it replaced.

 

[John.g]

If the boiler flow temp is the same as the old boiler then it should heat the house up in the same or less time, being a condensing boiler has no effect.
You or the installer might check if its CH output is range rated, ie output set too low.
The high pressure may be cutting out the boiler and then resetting when the pressure reduces but one might expect a alarm or status flag if this happens, mention this as well to the installer.

 

[ademanuele]

It is now some 2 weeks since I contacted the fitter and no response. I have contacted Worcester Bosch and they kindly provided the following information:

"A consistent discharge from the pressure relief pipe-work would indicate that the boiler is, or has been, regularly exceeding an internal pressure of 3 bar and thereby opening the valve to release excess water.

Incorrect pressures within the expansion vessel, the item re-pressurised with air using a foot pump, may cause issues with the system pressure when in operation. However we would not expect this from a new installation.

We would advise that ***** should investigate potential issues whereby water from the cold mains feed may be being introduced into the primary circulation within the boiler and causing a rise in pressure. This could include problems with the filling system, or a potential breach on the secondary plate heat exchanger."

What I would like to know is whether 3 months of high pressure is likely to cause any long-term damage to the boiler and what should I be asking the fitter to do. From previous postings the inhibitor needs to be topped up and pressure relief valve possibly replaced?

 

[ShaunCorbs]

No as there’s safety features but it needs sorting sooner rather than later

 

[EvilDrPorkChop]

Looks like a faulty or incorrect set Automatic filling loop to me. I've never fitted one of the new Worcester Auto ones yet, but due to this reason as i'm convinced something will always go wrong with them eventually.