Appliance Repair Questions? Ask a Technician for Answers ASAP
Good evening, and welcome to the Technical section in JustAnswer. My name is ***** ***** I will help you today. There's no time pressure on this topic - it will stay open to you for many days, and you can reply at any time. I will be away from my desk sometimes, but will respond as soon as I can.The symbol you're seeing indicates that the thermostat is in manual override mode.The override should be cancelled when the time reaches the next scheduled event. Is the symbol staying there indefinitely?
If you press + and - simultaneously, the thermostat should revert to its program. But it should revert of its own accord at the next event, so its behaviour suggests that its faulty.
I would also find a heating engineer to work on a heating system, rather than a plumber. Also, an electrician could do it, as long as they are familiar with heating system controls, otherwise they would struggle to test it functionally afterwards.Replacement like-for-like is straightforward because the backplate should be compatible, which means no wiring connections are needed - the programmer simply unclips and the new one clips on.