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Hi thanks for the replies I emailed honeywell who sais 'Please refer to attached page 29 concerning the Randall 4033, it was NOT the standard system. Rewire accordingly. If too tricky , then do a complete rewire according to the page 4 with a 10 way terminal block.' what do they mean...

Hi i have just changed my honeywell 4073a for the new 5 wire valve My problems come with this due to a danfoss 4033 programmer and wiring it in i have looked at th honeywell valve compatability guide and removed wire that connects to cylinder thermostat one at junction box and reconnected...