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I seem to remember from when I had a Y-plan system that there's a microswitch in the mid position actuator that supplies the boiler and pump when demand is for heating only, so if the actuator is not moving to the heating only position then, yes the boiler and pump will go off when HW demand is...

If I identify anything I'll post back here. I hate swapping stuff out willy nilly. Edit: I decided to brave the cold in the garage and observe the last cycle. Boiler started normally, it got up to 52C and 6 out of 8 bars on the output indicator when it went off with a soft pop. Demand...

Update: Well, that's odd. The CH came on again and I noticed that after about 8 minutes the pump stopped. I just got to the boiler in time to see that the front panel showed CH demand, the fan was running, but the burner was not lit. There was no error shown, and the boiler temperature was...

Nothing is shown other than the mode and temperature setting, just as in normal operation. I can now say that it seems like an intermittent boiler issue. I just observed a cycle where the problem did *not* occur. The displayed temperature started at 49C and the boiler commenced at about half...

Thanks for the reply, John. I've been observing the boiler (bl**dy cold standing in the garage) and think you're partly right. Towards the end of a heating period, when a number of radiator TRVs have closed, the boiler has modulated down and a pretty stable boiler temperature is achieved...

I've recently noticed a problem with my CH. The sytem is as follows: 1. Owl Intuition control system. 2. Two Myson MPE222 zone valves, one for CH and one for HW 3. Grunfoss pump. 4. Vaillant Ecomax Pro boiler. The boiler, pump and zone valves are all about 10 or 11 years old. The Owl...