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Yep - didn't have a valve open so I think I only did half (or less) a job. It doesn't rise as quickly as it did but it still heads towards 3+ bar eventually. Fortunately it's been warm so it's stable until a cold snap I guess.

I thought the EV was a vessel with a diaphragm separating the air from the water side. Might have read dem dar threads all wrong though.

Hi Terryplumb when you say drain do you mean open the drain cock and then repressurise forcing water out of the EV - rather than drain as in empty the whole system?

Boiler pressure dial was at 0. Let the water in to 1 bar. Run the boiler. Rose to 3+ bar. PRV valve opens. Switch off and it cools to 0 bar. I tried to re-pressurise the EV and I have it at 1 bar consistenly in off/cool state. But it jumps to 3 bar after 45 mins. I suspect it will go 3+ after a...

We have our bolier in the on mode for two hours in the evening. I'm trying to figure optimal settings so that in that period it's actually firing for the least amount of time to maintain the temperature at the level set on the hall thermostat. So yes that may wll lead to reduced gas usage.

Thanks for that. It seems the key is the hall stat as it controlds the boiler when the boiler is in an active period. So the quicker the hall heats up the quicker the stat switched the boiler off. It suggests to me that at least the hall rad needs to be wide open and maybe the boiler a little...

I have a thermostat in the hall that signals the boiler to switch off when the temp reaches 19 degrees. There is also a thermostat on the bolier 1-6 and max. And on the individual rads I-V. If I want to leave the hall thermostat alone is there anyway I can set the boiler and rad controls to...

The boiler side indicator was zero when I started the procedure does the 3 bar air charge force any residual water (not under pressure as the dial was zero) out of the EV?

Ah - the pump had a gauge but I closed off the drain cock between charges so it would have been sealed for the last charge. And yes, one for the engineer I think. It's a familiar story with my tinkering I'm very much a nearly man. On the plus side it sounds like it might be an easy fix when done...

The service engineers visit once a year - they've only ever topped up. When they service it maybe they have never run it long enough to see the pressure spikes. The latest one was a "pre-service" inspection so they should be back and I'll mention it to them then. Maybe the water hadn't fully...

Every year we get our boiler serviced and every year the engineer says the pressure is low (zero) I'll just top it up. On the odd occasion I've had a peak at the dial and topped it up myself. So it seems I might have had a problem for some years. This year was different the engineer topped the...