Pd on CAREL UltraCella: 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 pressure, cooling demand and command sequence when the timer expires.
2. Compare solenoid, pressure switch or transducer and pump-down logic with the machine diagram.
3. Do not extend the maximum time to hide a sequence that does not finish.

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.