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Sorry oilhead could you elaborate? there are two bleed screws on each double rad, I am bleeding through them. I don't know what you mean by bleeding both flow and return?

Thanks Oilhead. I actually do understand all that and I do understand the basic functioning of how an oil boiler works. My boiler always cycled as I believe most do, but not every 3 minutes on, 3 minutes off as it is doing now. It took almost 5 hours to bring the hall (where the zone 1 nest...

No, the boiler hasn't been serviced lately. Do you think the jets may be a potential issue? I haven't even considered the burner side of things because I presume a boiler overheat would be more to do with the 'water' side, ie flow, pump, thermostat related. The problem is that my boiler is...

thanks ericmark, appreciate the time you took to explain that. I don't know what's happening in my system at the moment, frankly Im exasperated. It has been fine for years, no noticeable cycling, certainly never tripping the high level trip and doing a great job warming the radiators to...

The more I try and look at this systematically, the more I tend to agree. Its a new pump, so I don't see an issue there. I did notice that the rads return valve on most of the radiators was screwed way down, in some cases, barely on. I am wondering is this over restricting the flow back to...

anyone?

Hi, I have an oil fired heating system, approx 17 years old. Its a Warmflow boiler with a Riello oil burner. The unit feeds the radiators plus a Santon pressurised storage water tank. I have 2 issues. Occasionally the high level trip activates meaning I have to reset the button. I have...