How to replace a blue switchmaster central heating valve 2.0

Tightboy

Hi, I need to replace my old Switchmaster 3 port valve and blue control box and read this thread https://forums.moneysavingexpert.com/discussion/1377333/how-to-replace-a-blue-switchmaster-central-heating-valve?utm_source=community-search&utm_medium=organic-search&utm_term=switchmaster

Can anyone advise on the wire mapping from the old 6-wire to the new 5-wire in a newer Honeywell v4073a unit?

Scrounger

Switch Master: Green/Yellow = Honeywell: Green/Yellow
Switch Master: Blue = Honeywell: Blue
Switch Master: Yellow = Honeywell: White
Switch Master: White = Honeywell: Grey
Switch Master: Orange = Honeywell: Orange
Switch Master: Red = Honeywell: NO wire; link old Red and Orange terminals together


Scrounger

Tightboy

Thank you Scrounger!
Can you tell me where you saw this info as when I'm asking various web sites including AI Copilot it appears to give a different answer each time?

Scrounger

Tightboy said:

Thank you Scrounger
... AI Copilot appears to give a different answer each time?

Proof that AI ain't all its cracked up to be.


Scrounger

Tightboy

I agree, thought I'd at least try it as it's all the rage today. But seriously, do you "just know from experience" or is there a good link you can recommend?
(I'm just about to order the bits from Screwfix and as I'm a tight***** I don't want to waste money :-)

Scrounger

Here's a post with feedback:

http://www.diynot.com/diy/threads/replace-6-wire-switchmaster-va1-with-5-wire-honeywell-v4073a.358504/

Seems to tally (but if still in doubt please do employ a heating engineer).


Scrounger

Tightboy

Below is the web link from the official importer/dealer, Resideo which confirms the above mapping.

https://support.resideo.com/s/article/How-to-replace-a-Switchmaster-Midi-valve-with-a-V4073A-mid-position-valve?language=en_US