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Just tested my flow switch theory, it appears to be that - it is keeping the circulation pump live & the feed to the burner, if I pull the sensor out of the top of the switch, the live feed is disconnected. New flow switch I think.

Hi oilhead, it appears to be - when I push down the inner part of the auto vent valve on top on the heatstore it certainlt squirts water out, not air. Dave

Thinking about what causes a demand for the hot water / boiler to fire up - is it possible that it is a intermittently faulty flow valve? Dave

Hi dcawkwell it's a new DHW thermostat about 6 weeks ago and this hasn't cured the problem - the heatstore intermittently gets very hot.

John - yep - I specifically checked this by checking the depth of the pocket with long piece of metal and then ckecking how far the DHW phial is going into the pocket. Also, the split pin on the outside of the pocket is holding it in properly. Somewhat flummoxed, sometimes it works fine and...

Thanks oilhead. The diverter valve is brand new, fitted by my heating engineer just under two weeks ago, and the DHW thermostat is new about a month to 6 weeks ago. I checked the heatstore auto vent and when I pushed the centre down, water came out - no air. It played up again this...

Hi Action, I have the same issue with my Heatslave 20/25 it seems. Do you ever esolve your issue? Thanks Dave

I have an ongoing intermittent issue with a oil fired Heatslave 20/25 OSO condensor boiler. Occasionally the boiler gets very hot, the DHW gets very hot indeed. When it is in this state, both thermostat controls (DHW and CH) do not respond. In addition, if the room thermostat is turned on...