CH pump is going, boiler is firing with the rad symbol flashing. Control unit definitely thinks CH is off and HW is on. Rads aren't hot yet but I'm off to bed. If I'm right, hopefully I just need to swap 1&2 and 3&4 in the controller?
Possibly... there might have been a reason it was wired that way...or not :)
@Howard started
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CH pump is going, boiler is firing with the rad symbol flashing. Control unit definitely thinks CH is off and HW is on. Rads aren't hot yet but I'm off to bed. If I'm right, hopefully I just need to swap 1&2 and 3&4 in the controller?