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My thermostat in my condo is a honeywell thermostat and it the only options it has are System and Fan. Fan is set to auto (other option is Lo Med Hi) and the System is set to Cool (or Auto or Off). When it reaches the desired temperature it does not turn off the fan but instead turns it down to Lo speed but keeps running. I notice that at this point it pumps humid air into the unit so my only options are to make it freezing cold so it never turns off cooling or to turn it off completely from fuse. Otherwise it will be humid 24/7. Should note that when System is set to OFF the fan is still running at Lo unless you pull the fuse. How can I fix this?

The tray is empty and not filled with water (someone told me that it could be humid because water isnt draining), the fan coils are dirty but it just looks some a bit of dust (this problem existed for the past 2 years and the fan coil is 2 years old so if it was a dust problem it wouldn't have existed earlier too.)

Furthermore it appears that the A/C is too big for the unit since it can get it from 30 down to 20 in 30 mins or less and constantly turns off cooling when it reaches the temp you set it too very fast.

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EDIT: Added images

Keep in mind in the first image R and RC have this metal loop connecting them and the wire is in RC.

  • Can you post photos of the wiring diagram and the actual thermostat wiring at your fan coil? – ThreePhaseEel Jul 19 at 23:41
  • What model is the thermostat? My thought is a setting is wrong in the thermostat. Wiring diagram and model numbers of the unit and we can get started in assisting. – user68386 Jul 20 at 0:14
  • @ThreePhaseEel Added pictures! – Siphonophorae Jul 20 at 1:09
  • @user68386 Added pictures! – Siphonophorae Jul 20 at 1:10
  • @Siphonophorae -- we need photos of the fan coil unit itself -- both its wiring compartment and its wiring diagram (which should be posted on the unit) – ThreePhaseEel Jul 20 at 1:14

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