P6-9 Carrier Controller Pre-trip Test Codes

P6 Tests - Refrigerant Probes, Compressor and Refrigerant Valves Tests: Pass/Fail testing is performed for the compressor, EEV, DUV, LIV (if equipped), ESV, and the refrigerant pressure and temperature sensors..

P6-9 Liquid Injection Valve Test
(If equipped) Test passes if change of suction pressure is greater than 4 psia when the valve opens for 10 seconds. Otherwise, it fails.