Daikin fault and error codes are like helpful messages from your air conditioner, telling you what’s wrong. When something’s not quite right or malfunctioning, these codes pop up on the display, making it easier to diagnose and fix the issue. Let’s decode these messages and keep our cool!
Simple Self-Diagnosis by Malfunction Code For Daikin Air Conditioner
For error codes beginning with 6, 7, 8 or 9, see table below.
For error codes beginning with A or C, find causes here
For error codes beginning with E, F, H, J, L, M or P, find causes here
For error codes beginning with U, find causes here
| Other Error Codes and Contents | Supposed causes | Parts affected |
|---|---|---|
| 60 External protection device activated (Heat reclaim ventilator) |
Actuation of external protection device Defective output signal wiring Defective control PCB |
Heat reclaim ventilator |
| 64 Malfunction of indoor air thermistor (Heat reclaim ventilator) |
Defective connector contact Defective indoor air thermistor Defective control PCB |
Heat reclaim ventilator |
| 65 Malfunction of outdoor air thermistor (Heat reclaim ventilator) |
Defective connector contact Defective outdoor air thermistor Defective control PCB |
Heat reclaim ventilator |
| 6A Malfunction of damper system (Heat reclaim ventilator) |
Defective connector contact Defective limit switch Defective damper motor Defective control PCB |
Heat reclaim ventilator |
| 70 System No. 2 Compressor overheat |
Shortage of refrigerant amount Defective connector contact Leakage of four way valve |
Chiller |
| 71 System No. 2 Compressor overcurrent |
Shortage of refrigerant amount Short circuit Defective compressor |
Chiller |
| 72 System No. 2 Fan motor overcurrent |
Defective fan motor connector contact Defective fan motor Defective PCB |
Chiller |
| 73 System No. 2 Actuation of high pressure switch (HPS) |
Dirty heat exchanger Shortage of water volume Clogged refrigerant piping Defective connector contact Defective HPS |
Chiller |
| 74 System No. 2 Actuation of low pressure switch (LPS) |
Clogged refrigerant piping Defective connector contact Shortage of gas Defective LPS |
Chiller |
| 75 System No. 2 Malfunction of low pressure sensor |
Defective connector contact Defective low pressure sensor Defective PCB |
Chiller |
| 76 System No. 2 Malfunction of high pressure sensor |
Defective connector contact Defective high pressure sensor Defective PCB |
Chiller |
| 77 System No. 1 Malfunction of fan inter lock |
Defective relay contact Broken wire |
Chiller |
| 78 System No. 2 Malfunction of fan inter lock |
Defective relay contact Broken wire |
Chiller |
| 7A System No. 2 Malfunction of compressor current sensor |
Defective current sensor Defective compressor Defective outdoor unit PCB |
Chiller |
| 7C System No. 2 Malfunction of pump inter lock |
Cooling water pump interlock actuated | Chiller |
| 80 Malfunction of entering water temperature thermistor |
Defective connector contact Defective entering water temperature thermistor |
Chiller |
| 81 Malfunction of leaving water temperature thermistor or drain pipe heater |
Defective connector contact Defective leaving water temperature thermistor |
Chiller |
| 82 System No. 1 Malfunction of refrigerant thermistor |
Defective connector contact Defective refrigerant thermistor |
Chiller |
| 83 System No. 2 Malfunction of refrigerant thermistor |
Defective connector contact Defective refrigerant thermistor |
Chiller |
| 84 System No. 1 Malfunction of heat exchanger thermistor |
Defective connector contact Defective heat exchanger thermistor |
Chiller |
| 85 System No. 2 Malfunction of heat exchanger thermistor |
Defective connector contact Defective heat exchanger thermistor |
Chiller |
| 86 System No. 1 Malfunction of discharge pipe thermistor |
Defective connecting connector Defective discharge pipe thermistor |
Chiller |
| 88 System No. 2 Malfunction of discharge pipe temperature |
Shortage of gas Defective discharge pipe thermistor Defective connector contact Clogged refrigerant piping |
Chiller |
| 89 Malfunction of brazed-plate heat exchanger freezing |
Dirty heat exchanger Shortage of refrigerant amount Defective thermistor |
Chiller |
| 8A System No. 2 Malfunction of leaving water temperature thermistor |
Defective connector contact Defective leaving water temperature thermistor |
Chiller |
| 8E System No. 1 Malfunction of suction pipe thermistor 1 for heating |
Defective connector contact Defective suction pipe thermistor |
Chiller |
| 8F System No. 1 Malfunction of suction pipe thermistor 2 for heating |
Defective connector contact Defective suction pipe thermistor |
Chiller |
| 8H Abnormal hot water high temperature |
Three way valve malfunction Defective thermistor Defect of water temperature setting |
Chiller |
| 90 Abnormal chilled water quantity or abnormal AXP |
Shortage of water volume Disconnection of AXP |
Chiller |
| 91 System No. 2 Malfunction of electronic expansion valve |
Defective connector contact Defective electronic expansion valve coil |
Chiller |
| 92 System No. 2 Malfunction of suction pipe thermistor |
Defective connector contact Defective suction pipe thermistor |
Chiller |
| 94 Malfunction of transmission (between heat reclaim ventilator and fan unit) |
Defective fan unit PCB Defective connecting wire between (1) and (2) |
Heat reclaim ventilator |
| 95 System No. 1 Malfunction of inverter system |
Defective fan inverter unit | Chiller |
| 96 System No. 2 Malfunction of inverter system |
Defective fan inverter unit | Chiller |
| 97 Malfunction of thermal storage unit |
Defective thermal storage unit | Chiller |
| 98 Malfunction of thermal storage brine pump |
Actuation of thermal storage brine pump overcurrent (OC) | Chiller |
| 99 Malfunction of thermal storage brine tank |
Low water level of thermal storage brine tank | Chiller |
