3. Outdoor unit failure mode table
POWER lamp | Abnormal point | LED indication |
(Indoor unit) | (Failure mode / protection) | (Outdoor P.C. board) |
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Condition
Correspondence
Indoor/outdoor
unit failure
mode recall
function
Outdoor unit failure mode recall function
OFF | None (Normal) | — | — | — |
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Outdoor power system |
| Overcurrent protection stop is | •Reconnect connectors. |
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2.5 seconds |
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| continuously performed 3 times within | •Refer to | "How | ○ | ○ |
OFF |
| — | 1 minute after the compressor gets | to check inverter/ | |||
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| started. | compressor". |
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| •Check stop valve. |
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Discharge temperature | Thermistor shorts or opens during | •Refer to |
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2.5 seconds | thermistor | 2.5 seconds | compressor running. | "Check of outdoor |
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OFF | Defrost thermistor |
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| thermistors". |
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| Defective outdoor |
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| thermistors can be |
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| Fin temperature thermistor |
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| identified by checking | |||||
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| 2.5 seconds OFF |
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| the blinking pattern of | ||||
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| P.C. board temperature |
| LED. |
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| thermistor | 2.5 seconds OFF |
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| Ambient temperature |
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| thermistor | 2.5 seconds OFF |
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Overcurrent | Large current flows into intelligent | •Reconnect compressor |
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2.5 seconds |
| 2.5 seconds OFF | power module. | connector. | "How |
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OFF |
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| •Refer to | — | ||
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| to check inverter/ | |||
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| compressor". |
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| •Check stop valve. |
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| Compressor synchronous | Waveform of compressor current is | •Reconnect compressor |
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| abnormality (Compressor | 2.5 seconds OFF | distorted. | connector. | "How |
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| •Refer to | — | |||
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| to check inverter/ | |||
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| compressor". |
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Discharge temperature |
| Temperature of discharge temperature | •Check refrigerant |
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2.5 seconds |
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| thermistor exceeds 241 °F (116 °C), | circuit and refrigerant |
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OFF |
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| compressor stops. | amount. | "Check |
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| — | Compressor can restart if discharge | •Refer to | — | ||
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| temperature thermistor reads 212 °F | of LEV". |
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| (100 °C) or less 3 minutes later. |
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High pressure |
| Temperature of indoor coil thermistor | •Check refrigerant |
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2.5 seconds |
| — | exceeds 158 °F (70 °C) in HEAT mode. | circuit and refrigerant | — | ○ | |
OFF |
| Temperature of defrost thermistor | amount. |
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| exceeds 158 °F (70 °C) in COOL | •Check stop valve. |
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| mode. |
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Fin temperature/ P.C. board | Temperature of fin temperature | •Check around outdoor |
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2.5 seconds | temperature | 2.5 seconds OFF | thermistor on the inverter P.C. board | unit. |
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OFF |
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| exceeds 167 ~ 176 °F (75 ~ 80 °C), or | •Check outdoor unit air | — | ○ | |
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| temperature of P.C. board temperature | passage. | "Check | ||
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| thermistor on the inverter P.C. board | •Refer to |
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| exceeds 158 ~ 167 °F (70 ~ 75 °C). | of outdoor fan motor". |
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Outdoor fan motor |
| Outdoor fan has stopped 3 times in a | •Refer to | "Check |
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2.5 seconds |
| — | row within 30 seconds after outdoor | of outdoor fan motor". | — | ||
OFF |
| fan | Refer to | "Check | |||
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| of inverter P.C. board". |
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Nonvolatile memory data | Nonvolatile memory data cannot be | •Replace the inverter | ○ | ○ | |||
OFF |
| 2.5 seconds OFF | read properly. | P.C. board. |
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2.5 seconds |
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Discharge temperature |
| Temperature of discharge temperature | •Refer to | "Check |
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2.5 seconds |
| — | thermistor has been 122 °F (50 °C) or | of LEV". |
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OFF |
| less for 20 minutes. | •Check refrigerant | ||||
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| circuit and refrigerant |
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| amount. |
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DC voltage | DC voltage of inverter cannot be | •Refer to | "How |
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2.5 seconds |
| 2.5 seconds OFF | detected normally. | to check inverter/ |
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OFF |
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| compressor". |
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Each phase current of | Each phase current of compressor |
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| compressor | 2.5 seconds OFF | cannot be detected normally. |
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Overcurrent Compressor | Large current flows into intelligent | •Reconnect compressor |
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2.5 seconds | 2.5 seconds OFF | power module (IPM). | connector. | "How |
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OFF |
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| The | •Refer to |
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| compressor is detected. | to check inverter/ | — | ○ | |
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| The interphase short out occurs in the | compressor". |
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| output of the intelligent power module |
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| (IPM). |
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| The compressor winding shorts out. |
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Stop valve (Closed valve) | Closed valve is detected by | •Check stop valve | ○ | ○ | |||
OFF |
| 2.5 seconds OFF | compressor current. |
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2.5 seconds |
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NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table
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