UPDATED A5 Panasonic technical handbook F 2025 - Flipbook - Page 155
Commercial Fault Codes Ð P Type Protective Device
Type
Protective
Device Issues
Alarm Code
P01
P02
P03
P04
P05
P09
P10
P11
P12
P14
P15
P16
P17
P18
P19
P20
P22
P26
P29
P30
P31
155
Alarm Meaning
Indoor unit fault, Fan motor thermal overload
Indoor Unit Problems Outdoor unit fault, Compressor motor thermal overload, over or under voltage
Outdoor unit fault, Compressor discharge temperature too high (Comp1) over 111°C. Low on ref gas, exp valve, pipework damage.
Outdoor unit fault, High pressure trip
Outdoor unit fault, Open phase on power supply. Check power on each phase, inverter PCB, control PCB
Indoor unit fault, Ceiling panel incorrectly wired
Indoor unit fault, Condensate float switch opened
GHP - Water Heat exchanger low temp (frost protection) fault
Indoor unit fault, Fan DC motor fault
Input from leak detector (If fitted)
Refrigerant loss, high discharge temp and EEV wide open and low compressor current draw
Outdoor unit fault, Open phase on compressor power supply
Outdoor unit fault, Compressor discharge temperature too high (Comp2) over 111°C. Low on ref gas, exp valve, pipework damage
Outdoor unit fault, By-pass valve failure
Outdoor unit fault, 4-way valve failure, indoor temp rises in cooling or fills in heating. Check wiring, coil, pcb output, valve operation
Ref gas, high temp/pressure fault, heat exchanger temp high C2, 55-60°C, cooling over-load, sensor fault
Outdoor unit fan motor fault, fan blade jammed, check connections, does fan turn freely, motor resistance 30-40ohm on each pair, no fan fault, yes PCB fault
Outdoor unit fault, Compressor overcurrent - check winding resistance, Inverter failure - check internal resistance term HIC + & - to UVW 200-300Kohm or
more
Outdoor unit fault, Inverter circuit fault - Motor-current Detection Circuit (MDC) fault, check comp windings, sensors C1 & TS, if ok possible PCB failure
Indoor unit fault, System controller detected fault on sub indoor unit
Simultaneous operation multi control fault, Group controller fault
