bLo on CAREL MPXPRO: meaning and checks

First checks, in order

The checks below are a REFTHE editorial path to compare with the machine diagram, configuration and manual.

1. Record superheat, valve position or command and cycle conditions at the same time.
2. Compare probes, wiring, driver supply and configuration with the applicable manual.
3. Do not force the valve or change protections only to remove the code.

What the code does not prove

The code directs the investigation but does not, by itself, prove that a probe, valve, controller or other component is faulty.