Like you, my PCB has only one relay. This means that the Fan is 12v DC. (FYI: All PCB spares for sale now are for Mains (240v ac) operated fan via the 'second' Relay.
In my case, nothing to do with capacitor or PCB: If the fan does not rotate, the Compressor will switch off within one second (electronic protection). I simply use WD40 to loosen the fan motor - which was sluggish - as I could not dismantle the factory-fitted motor/fan assembly. The whole dehumidifier is working now (Although I wish I could find a DC Fan Motor spares).
Delfy
February 2014