Interesting, new PWM board is even labeled "Laing DDC 3.1-PWM". I was on Laing's site the other day and notice they also can make D5 PWM controllable.
Looks like you just need a pump with this PCB. The "Spare" contact is the PWM control wire I presume..
Thanks for the link..
Buddy, what does you're PCB say? Is it 3.1PWM or is there also a 3.2??
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