The humidifier is wired to the heat cycle of the furnace, so it starts working only when the thermostat calls for heat. However, when I set the thermostat FAN ON (instead of AUTO) the humidifier does not kick in. It is still pretty dry in the house and my intention is to wire the humidifier such that it starts when the furnace fan starts (even without heat). I assume this has to do with changing the connections on the circuit board. As it is now, the 24V transformer of the humidifier has two wires connected to the HUM-N terminal (circled with RED in the picture) and to EAC-N terminal (circled with BLUE in the picture).
Could anyone please advise how to change the wire to achieve what I want, if at all possible? Your help is much appreciated, thank you!