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Yes, the handheld thermostat has the batteries and it works. So batteries are OK. Yes, I followed this guide. Relay box doesn't have the lights at all. So "until the red LED blinks rapidly" - never happens. Contacted the electrician, because I believe there may be some power issues with the...

Yes, I am

Yes, I tried re-binding. So far it all ends at the point when I need to press the button on the wall, and it should start flashing red (it never does) Wall-mounted unit has power from the mains, not from batteries, unfortunately.

We have a Valiant ecotecpro24 boiler which is also connected to Honeywell DTS92E thermostat. The boiler worked fine in winter for both water and radiators. But now it only heats water, and never the radiators. I suspect the issue may be in the thermostat because I can’t turn it on anymore (the...