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Thank you very much for your reply. I was also expecting some sort of wiring issues. I have the boiler's annual service booked for next Wednesday. I hope the engineer will pick up any wiring faults. Will keep the forum posted. Any other ideas please?

The entire system was installed 2.5 years ago. No new additions have been made since. It was all working fine until beginning of the month. One day I noticed that ground floor rooms were cold. I checked the flame symbol on the Thermostats. They were all on and the system was running with cold...

When I said the pump keeps running, it is the underfloor heating pump connected to the Manifold that keep running. The boiler pump doesn't run and the display is blank. The Reset button does nothing.

When the boiler comes on, it shows S04 and then it goes blank with no display. I have 4 Type 22 radiators of about 1500mm width and 3 towel radiators. When the radiators demand for heat, the boiler runs fine with code S04. Since the underfloor heating won't run on its own, I am having to either...

Hi, I need bit of help with understanding a fault with my underfloor heating system. I have a Vaillant EcoTechPlus 637 system boiler. Hot water from the boiler is divided 3 ways using Honeywell 2 Port valves - Hot water to a cylinder, Radiators Upstairs and under flor heating on the ground...