Pressurised system help...please!

[bowfer]

EV air pressure can only be set once you have got rid of the system water pressure, air pressure should be around 0.9 bar, if water leaks from the schroeder valve then the EV needs replacing.

I've no idea what this means.
But there's no visible water leaks from the red bottle.

 

[Best]

I've no idea what this means.
But there's no visible water leaks from the red bottle.

It means the air charge to the red expansion vessel can only be set if the system water pressure is put down to zero.
The reason the air charge has to be kept to a certain pressure is so that the vessel allows system water to expand without over pressurising and resulting in the pressure relief valve opening and discharging some system water

 

[heatservice]

I've no idea what this means.
But there's no visible water leaks from the red bottle.

Remove the dust cap from the EV's air valve, press the needle down, you should only get air released, if you get water the EV (red bottle) is no good.

 

[Best]

Remove the dust cap from the EV's air valve, press the needle down, you should only get air released, if you get water the EV (red bottle) is no good.

Although you sometimes will get some water inside vessels air side

 

[bowfer]

So, bottom line, do you think the 'broken' fill loop and running-on of the boiler and pump are unconnected?
Just coincidence?

 

[gmartine]

You have two problems...system pressure and run-on they are it appears unconnected.

Pressure - leaking TRV's/EV, dodgy filling loop.
Run on after complete switch off (your description) - Faulty controller/ PCB, valves, very odd.

 

[bowfer]

When I say complete switch off, I mean the timer controls.
They're both showing off, but the pump and boiler keeps going.
The pump gets progressively louder the longer it runs on, which I assume is because no water is going through it (the radiators do cool down)
If I press 'advance' and make the heating controls light up again, the pump goes back to being quiet after a while.
So it would suggest the pump is running on, but some valve or other is closing off water to it.
When I press 'advance' this valve is opening again and allowing water to go through the pump again.

 

[gmartine]

Wait for your engineer to turn up, get them to sort out the pressure/filling loop and point out the leaking TRV's. We can't accurately diagnose your run on issue remotely but as Best mentioned motorised valves can fail and energise your boiler and pump, get them to check that too.

 

[heatservice]

I have come across the boiler & pump running on a few times due to a 2 port valve actuator fault, valve closes but microswitch still in open position, water will then circulate through the bypass.

 

[bowfer]

Engineer came, unfortunately I couldn't be there in person but I spoke to him on the phone. He asked if I knew where some valves were, my wife advises he then 'changed some bits under the floor'. I also noticed he changed the fill loop pipe/valves. Fingers crossed the running on stops. Next move is to get them to change the 3 x leaky TRVS.
baby steps!