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finally found out what the problem was - the maximum outside temperature setting in the installer menu was set to 10C , as it was above 10C outside the CH wouldnt stay on. Changing the setting back to the default 21 fixed the problem

VRC 700f/4 with VR 66/2. The other interesting issue is, which may or may not be relevant. is that the display on the front panel doesnt show the radiator symbol in the bottom right panel, except at initial power on. It appears highter up on the LHS when heating is live. The parasol doesnt...

interesting thought, but not convinced that is the problem. getting the CH to come on at system power up has, from my perspective been a challenge since day on. The solution adopted was to take out the 3 way motorised valve and replace it with a V4044C 2 way divertor valve, engergised to HW...

I think this problem has been there since first install, the service engineer, yesterday, said the boiler wasnt working correctly and I needed to get vaillant out to fix it. It is 12 months old and under warranty. I have no faith in the orginal installers competence - long story. If mains...

posted on another thread when I should really have started a new one so here goes. An ECO4 installer has fitted Honeywell (OpenTherm) controls to a Valliant Open Vent Boiler with remote Cylinder. Based on room size and radiator size calculators I believe the radiatiors have been specced to...

noted will start a new thread but can gasp how it would work with a smart stat that reported actual temperature

The drivers behind my research is a Vaillant open vent boiler has been fitted under EC04, (PASS 2035 demands smart controls and a fully integrated systems) but they have fitted Openthem controls. I am trying to get them to swap out the Opentherm controls for Valliant eBUS but its hard going...

I have spent ages trying to understand Vaillant controls and havent made much progress - Vaillant VR921 sesnoNET internet gateway as an alternative to a VR92. ?