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BG is very funny, I always wonder how is he employable?

Honeywell Evohome system, asked @Dan Robinson above if you are in north London or home counties

In your case, it is a switch, it doesn't matter. Com = common NO = Normally Open

Find a filling loop like this.

It doesn't matter, as it is a switch.

£110

5108265 (white), and 5114725 (red).

I feel you always pick up bone from egg? E20 error code, in theory it can be the sensor, can be the connectors, can be the loom, can be the board, even can be over heat, no circulation..., do we need an endless list?

You just don’t understand our practice work! In such a case, it is more likely by a failed NTC not by the board, ie, NTC being open circuit or short circuit.

Checked again, E20 - Central Heating NTC Fault. It it is NTC fault, it need to be replaced.

As far as I remember, Baxi error code is in this format: E1 followed by 33, so we call E133. What about yours?

Do you know radiator balancing? Do you just have a particular radiator which is very hot? Or, @Steelmasons the internal bypass fully opened?

Have you seen a status code of S53?

Increase them?

Try this first. Installer level - Appliance config. - Factory Setting - Reset to factory settings? - Yes.

Press "i" button to see what is the status code.

Too cheap!

Nest will save bit than Hive on gas bill.

74kW boilers for over 500 SQM!

It is an earlier version of ecoTEC, PCB is prone to be dead, I always carry one in my van. As @muggles said, CET at Watford is selling re-con PCBs.