I have replaced the door actuator motor already and it would appear that they sourced the new gears with an even softer cheese (Bree?) and two years later it is thumping again! GRRRR anyway what would unplugging the actuator do if I couldn't care less about recirculation as a setting? I am assuming all it would do is de-energise the actuator and allow the damper door to stay in place where ever it is and stops the thumping.
The space is very cramped and made me say unkind words the last time i replaced it, I would like to forgo that again as well as buying a crappy replacement actuator.