Vaillant EcoTec 630 - will only partially fire and won't heads the rads

[BikeSausage]

Morning all,

I'm new and shiny here and seem to have developed a heating problem this morning. Any pointers for a quick resolution would be appreciated as my ears are now hurting! 🙄

I have a Vaillant Ecotec Plus 630 driving rads, hot water and underfloor heating in some of the house via manifolds.

This morning, all of a sudden with no changes to any controls, we have hot water, a warm kitchen floor but cold rads. The TRVs are open, the old school Honeywell thermostat is asking for heat and the Honeywell timing controls are in the "on" position.

The boiler itself: rad water heat is set to 75. It seems to fire properly for water but it won't go beyond the lowest indicated flame on the display for rads. There's enough water in the system with the level set bang in the middle of the min/max and pressure at about 2.1 bar.

I've reset it twice by pressing and holding the flame button but the best I get is about 60 deg C on the display with the flame at "idle" speed. It doesn't go out entirely unless the stat temp is lowered to eliminate the demand.

But the rads are still stone cold, so not even that 60 deg C is getting through to them.

Anything I can do/press as a non-expert user to sort this out?

Thanks in advance.....

 

[Aquarius]

Good afternoon bikesausage,

What motorised valve(s) do you have?

 

[Scott_D]

Any pictures of the pipework and valves?
Have you closed anything like magnetic filter valves?