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Hi,
I want to replace an aging Randall 4033 Heating and Hot water prgrammer, see wiring diagram below, with a new electronic unit.
As I don't want to chase any more wires into the tiled wall can anyone recommend an appropriate compatible replacement please?
As there is a common present does this have to be used or can a new electronic prgrammer without common terminals be used, such as Dandoss Mk18? Equally can the common be shared for a programmer requiring common on heating and water, Danfoss SET3E.
Mk18 FP715
SET3E
I would state that I'm after advice before calling a pro, I just want to understand what I'm talking about a bit more first.
Many thanks.
I want to replace an aging Randall 4033 Heating and Hot water prgrammer, see wiring diagram below, with a new electronic unit.
![wiring_d_4033(2).gif](http://www.danfoss-randall.co.uk/Site/images_library/wiring_d_4033(2).gif)
As I don't want to chase any more wires into the tiled wall can anyone recommend an appropriate compatible replacement please?
As there is a common present does this have to be used or can a new electronic prgrammer without common terminals be used, such as Dandoss Mk18? Equally can the common be shared for a programmer requiring common on heating and water, Danfoss SET3E.
Mk18 FP715
![wiring_d_cp_fp715(1).gif](http://www.danfoss-randall.co.uk/Site/images_library/wiring_d_cp_fp715(1).gif)
SET3E
![wiring_d_set2e_3e_etc.gif](http://www.danfoss-randall.co.uk/Site/images_library/wiring_d_set2e_3e_etc.gif)
I would state that I'm after advice before calling a pro, I just want to understand what I'm talking about a bit more first.
Many thanks.