Honeywell st9400c to Drayto Wiser

Gritty · 1 Dec 2025

Hi. I have a Honeywell programmer with remote CH thermostat (oil boiler and hot water cylinder). I want to replace with a Drayton wiser 2 kit. The wiring is shown in photo. Do I need to change it?

CountryFan · 1 Dec 2025

Gritty said:
The wiring is shown in photo. Do I need to change it? It’s

If it’s an industry standard backplate and Drayton will be then clip it on. If it’s not, then you’ll need to transfer them over, should be straightforward enough.

Gritty · 1 Dec 2025

Thanks. It will clip on to the backplate but I'm not sure the current wiring is correct for the new programmer.

CountryFan · 1 Dec 2025

Gritty said:
I'm not sure the current wiring is correct for the new programmer.

It looks the same to me apart from maybe the earth/cpc

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Honeywell st9400c to Drayto Wiser

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