Isolating Ideal Logic+ 30 Combi

[thomp1983]

Hi all,

I have an ideal logic+ combi 30 that slowly loses pressure over a week.

A while ago I tied off the prv outlet with a bag to prove it wasn't passing and it doesn't appear to be.

Next I want to isolate the boiler as I've a couple of days where it won't be used.

Am I correct in thinking turning the 3 valves marked to the position there in now will isolate the boiler? All 3 were vertical originally and I know the front blue and black are the filling loop and the yellow the gas so it's none of those 3.

That leaves the 3 I've turned today but I've a feeling I actually only needed to turn 2 of them?

Would I be correct in thinking if I still loose pressure now then it's something internal to the boiler that's failing?

Thanks
Chris

 

[Madrab]

The 2 black outer pipe valves will isolate the flow and returns. If you set the pressure and then isolate both valves and the pressure still drops then it's internal to the boiler - if it holds and then drops when the F&R valves are opened then the drop is out on the system somewhere.

 

[DP]

If those valves are moved after boiler has been in use for a while like ideal in the picture ( early model) there is no guarantee the valve will close, handle moves but valve spindle does not or valve does not isolate completely

Pressure gauge on flow indicates early ideal logics

 

[kidgreen61]

Those 2 valves on flow & return appear to be closed, assuming (as DP says) they're working properly.

The blue valve is mains cold inlet, which is also in the closed position, if it is closed, no water will come out of hot taps.

 

[thomp1983]

If those valves are moved after boiler has been in use for a while like ideal in the picture ( early model) there is no guarantee the valve will close, handle moves but valve spindle does not or valve does not isolate completely

Pressure gauge on flow indicates early ideal logics

You were right, following your post I thought I'd remove the filling loop and sure enough with the valve 'closed' it's still passing water. I removed the tap and closed the valve with a spanner and it's still the same so I guess I'll need to source a new valve for it to conduct the experiment correctly.

Thanks
Chris

 

[thomp1983]

So back to this again, still losing boiler pressure over the course of a week.

We went on holiday last week so I bought 2 new valves and fitted them to make sure the boiler was definitely isolated.

I topped the boiler upto 2 bar, isolated and switched it off at the mains.

When I've returned today the boiler has dropped to 1 bar so am I right in thinking the fault lies within the boiler either with the heat exchanger or the expansion vessel both of which will require a rgi as there within the sealed chamber of the boiler?

I've added a picture of the positions I left the taps in whilst away.

Thanks
Chris