I have a underfloor heating system installed in my apartment.
Each room has a Uponor T-37 thermostat, hooked up to C-35 controller.
The system is about four years old and recently I have noticed a regular clicking sound from the relay in the controller unit.
At thermostat side, when I turn the dial so I can heat into the room, the LED comes on, then after 5 seconds or so it turns off. The light then comes back on again after a half-second or so. This cycle repeats, and seems to happen simultaneously at each thermostat in every room/zone.
I assume this is bad for my boiler/heating system because it's receiving a command to supply heat on/off every few seconds.
Any ideas on what could be wrong?
I've tried to turn-off power to heating system and boiler for a few hours, thinking it might reset any fault.
I was worried about taking off the cover off the control unit incase there maybe a danger of a shock. I removed the cover of the thermostat and noticed that as the LED switches off, it flashes rapidly.
I'm in the process of calling in a plumber/heating technician, but just thought I try and do my own research on the matter to see if there is an easy fix. Hoping it won't be an expensive repair.