Cause of error code A33

Fan speed error.

- Fan speed detected differs from targeted value by more than 300 rpm for more than 60 seconds.

Solution for error code A33

Is the fan running?
- Yes: Check 4-wire blower harness & connectors for loose connections.
- Yes: Check current fan speed under “Status” in “Installer Menu”.
- No:  Check 3-wire blower harness & connectors for loose connections.