IET Forums - motorised valve, programmer, cylinder wiring Mar 09, 2012Topic Title: motorised valve, programmer, cylinder wiring Topic Summary: wiring up and colours (central heating) was putting a voltage on the motor drive and the n/o2 (hot water) was putting one on the valve switch (orange), with the grey from the valve putting a voltage on the pump and boiler. lot's of info. and wiring diagrams there Honeywell Motorised Valves — Problems and Fault Finding May 15, 2019Honeywell Motorised Valves — Problems and Fault Finding. Also applies to ACL Drayton, Iflo and British Gas Motorised Valves. Please read our Legal Disclaimer. The Honeywell motorised valves we see most commonly in the UK are the Honeywell V4043H zone valve (Honeywell 2 port valve) and the Honeywell V4073A mid-position valve (Honeywell 3 port valve).
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