Cause of error code A33

Fan speed error.

- Fan speed detected is more than 300 rpm different from targeted value for more than 60 seconds.

Solution for error code A33

1. Is the fan running at full speed?
- Check 4 wire control connection to blower and control.
- Replace harness.

2. Is the fan running at a modulated speed?
- Check 4 wire control connection to blower and control.
- Replace harness.

3. Is the fan not running?
- Check the 3 wire power connection to the blower and control.
- Replace harness.
- Replace Blower.