Recent content by BobHumphrey

Problem is now resolved. It was caused by a faulty Sunvic 207 XLS programmer. This was determined by disconecting HTG ON from the Sunvic and establishing that the Sunvic terminal for HTG ON was always "on"/live. The cause is potentially a faulty relay in the Sunvic. Have now replaced the...

Link L4 and L5 are cut. I havent cut L6. I only learned today that the boiler supports pump overrun. I will cut this when I am at the house tomorrow. Do you believe this could be my problem? I will verify all voltages tomorrow should the problem persist. Many thanks for your time in...

That is true. I guess it could be a faulty timer, but I want to be sure that it isn't somthing else causing the demand before I go down that route. Many thanks Bob

I am not at the house at the moment, but from memory, when the room stat is turned up (on) and the heating and HW demand turned off on the timer, then Orange on the Danfos valve is live. Normal live to the Stats, pump and boiler are present too. I will have to verify the rest. regards Bob

Having bought a house, I found the old Sunvic mechanical heating timer was not working, so replaced it with a Sunvic 207XLS timer. I have used a Honeywell Sundial Plan Wiring Centre to connect all the various connections. The system is wired for a Y plan system using:- Sunvic Room Stat Sunvic...