I have just added underfloor heating as a second zone to an ectotec 831 boiler, but I'm having a few problems setting up the controls.
Originally, the boiler was controlled by a VRC400 and this worked well. while waiting to finish off the build, the radiators and underfloor heating circuits (each with a 2 port valve) have been controlled by simple thermostats and while this worked fine, I want to get back to a weather compensated system using vaillant controls.
The Vaillant helpline said a VRC61, will work with a combi boiler so I have upgraded to this, with a VRC430 and VR81 to control the underfloor zone. I have read people's thoughts on the vaillant helpline though!
The VRC430 and VR81 light up ok and going through the installation assistant opens the valves when activated from the system check screen. However, when I try to use it, the boiler now fires immediately it's switched on and while the zone valves are shut, so overheats and locks out. It seems like the boiler isn't being controlled by the system, although the valves are??
All the controls are new (read this should work with the later VRC430 software), but the boiler is about 4 years old). Am I missing something obvious??
Many thanks, Barry
Originally, the boiler was controlled by a VRC400 and this worked well. while waiting to finish off the build, the radiators and underfloor heating circuits (each with a 2 port valve) have been controlled by simple thermostats and while this worked fine, I want to get back to a weather compensated system using vaillant controls.
The Vaillant helpline said a VRC61, will work with a combi boiler so I have upgraded to this, with a VRC430 and VR81 to control the underfloor zone. I have read people's thoughts on the vaillant helpline though!
The VRC430 and VR81 light up ok and going through the installation assistant opens the valves when activated from the system check screen. However, when I try to use it, the boiler now fires immediately it's switched on and while the zone valves are shut, so overheats and locks out. It seems like the boiler isn't being controlled by the system, although the valves are??
All the controls are new (read this should work with the later VRC430 software), but the boiler is about 4 years old). Am I missing something obvious??
Many thanks, Barry