It seems to have been doing it more often recently so I figured I'd try moving it out of the airing cupboard incase it was the heat affecting it. I drilled a hole in the wall and mounted it in more or less the same place on the other side (so now in the landing). An additional range of accessories allow the FP715 Si to be used in other upgrade situations where the unit being replaced is larger than the new unit and a decoration scar would normally have been left.

FP715 Si Electronic, 2-channel full - Danfoss

The FP715Si features a user-friendly interface and a clear digital display, making it simple to program and operate. With its intuitive navigation, users can easily set up specific heating schedules and temperature levels for different times of the day. the Motorised Valves (HPA2) or your Circulating pump - its not always the timers fault but your electrician will be able to diagnose the fault for you before you buy. THIS IS THE FIRST TIME I HAVE USED MYTUB BUT IT CERTAINLY WILL NOT BE THE LAST. THE SERVICE WAS PROMPT AND THE VALUE WAS AMAZING, EVEN MY PLUMBER COULD NOT OBTAIN THE GOODS AT THE PRICE I PAID.

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But can I bypass the wiring of the danfoss to just make the CH on all the time, so it can then be left switched off on the danfoss? Or does that confuse it?! My advice: Find an electrician who enjoys heating controls and let him/her select the product that will do the job. Otherwise you’ll buy the wrong thing and waste your money. Relieved to see that this programmer is still available but thanks to coronavirus getting a tradesman to fit one could be a problem as we are in isolation due to age. In terms of installation, the FP715Si offers flexibility. It can be hardwired or configured for battery operation, depending on the user's preferences and needs. This ensures compatibility with a wide range of heating systems.

Danfoss FP715Si (TP9000) 2-channel CH/HW - DIYnot Replacing a Danfoss FP715Si (TP9000) 2-channel CH/HW - DIYnot

Thanks for your considered responses. I have the manual but when I follow the instructions to reset the date and time, it just doesn't work! So, I have just come to the conclusion that updating it makes sense.However you say "Turned the thermostat right down but heating stayed on." which does not seem to point to the programmer. Discovered during the night that the central heating was still on despite the programmer indicator light being off. Turned the thermostat right down but heating stayed on. Time for a new programmer. The Danfoss FP715Si is a thermostat that offers precise temperature control for residential heating systems. Designed with functionality in mind, this thermostat allows users to easily adjust and maintain their desired indoor temperature. Additional features such as service interval timer, convenient user overrides, built-in ready-to-use programmes, a day programme copy facility as well as a stylish, compact design and easy to read display make the FP715 Si the simple answer to all heating and hot water requirements. The Danfoss FP720 (replacing the FP715Si) two-channel full programmer has separate heating and hot water outputs operating on completely independent time bases for maximum flexibility.

replacing a danfoss fp715 with a fp720 - DIYnot replacing a danfoss fp715 with a fp720 - DIYnot

But the Hive is much simpler and cheaper, no option for Opentherm, and no cleaver algorithms, and the base stops taking a demand for heat after 22ºC so the base unit really designed to be in a room normally kept cool, like the hall. The wallplate used follows the industry standard pattern, as used by many of the other time control manufacturers. This allows for direct replacement often without the need for re-wiring. As it works with just one thing on at once in my case, is it possible to bridge the wires for the Central Heating so that it is in effect on all the time but could be left in the off position? I got it wrong, so trying to stop you making same mistake, I selected Energenie as was told they worked with Nest, but that is not the case. There is a guide here which also says Energenie works with Nest, seems they did until Google took them over. The FP715 Si two-channel full programmer has separate heating and hot water outputs operating on completely independent time bases for maximum flexibility.

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I apologise that this has turned into a bit of an essay, but any expert help you could pass on to me would be greatly appreciated. Although your likely not considering swapping all TRV heads to linked heads now, before selecting a replacement you need to consider what you may want to do in the future.