I'm replacing Programmer Horstman H27XL with a Honeywell ST9400C but having problems with the wiring as the Horstman had 9 connectors and the Honeywell has only 7.
I've attached a photo of the Horstman wiring and a photo of how I've wired in the Honeywell.
I don't think it's heating the water
The central heating works
What have I done wrong?
I have an interconnecting loop over
Thanks
I've attached a photo of the Horstman wiring and a photo of how I've wired in the Honeywell.
I don't think it's heating the water
The central heating works
What have I done wrong?
I have an interconnecting loop over
Thanks
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