Mitsubishi MR. Slim P Series K air conditioner fault codes

FAULT CODEDESCRIPTION
EOSystem transmission error - check for possible comms fault between I/C and R/C,
could also be incorrect group or master/slave settings (check CN40, SW2 and SW6)
P1TH1 fault - check return air thermistor (6.4K_ @ 20°C)
P2TH2 fault - check coil/pipe thermistor (6.4K_ @20°C)
P3System transmission error - check for possible comms fault between I/C and R/C,
could also be incorrect group or master/slave settings (check CN40, SW2 and SW6)
P4Drain sensor fault - check drain sensor resistance, connection and continuity
P5Drain fault - unit has detected high condensate - check for blockage in drain or tray,
pump failure or sensor fault
P6Frost protection in cooling/Overheat protection in heating - detected by indoor coil sensor -
general causes are lack of air flow or refrigerant charge problem
P7System error - address setting fault - check CN40 SW2 and SW6. Potential board issue
P8Abnormal pipe/coil temperature - no temperature change at indoor unit after 9 minutes
of operation. General causes are outdoor unit tripped, problem with refrigerant charge
or lack of air flow at the indoor unit. TH2 faulty or not mounted correctly
LD1Reverse phase on mains supply - change phases around, check for potential board problem
LD2Component open circuit - check CH, 52C, 21S4, SV, 63H and 26C for open circuit or disconnected
LD3Outdoor coil thermister is open or short circuit may be disconnected or outdoor board fault
LD463H high pressure switch open - investigate high pressure causes, 63H switch disconnected
LD551CM overcurrent relay open - compressor locked or pulling too much current -
check power supply.
LD626C thermal switch open - check if refrigerant level low or if 26C is disconnected
LD7Overheat protection - coil temp has exceeded 67°C - reduced airflow through condenser -
check for fan motor problem or thermistor problem.
LD8Input circuit of outdoor board - replace the outdoor board