9-3. SELF-DIAGNOSIS ACTION TABLE
Note: Refer to the manual of outdoor unit for the details of display such as F, U, and other E.
Error Code | Abnormal point and detection method | Cause |
| Countermeasure | ||
| Room temperature thermistor (TH1) | Defective thermistor | – Check resistance value of thermistor. | |||
| The unit is in | characteristics | 0 | • • • • • • • • • • 15.0k | ||
| prevention mode if short/open of | Contact failure of connector | 10 | • • • • • • • • • • • • 9.6k | ||
| thermistor is detected. Abnormal if the | (CN20) on the indoor controller | 20 | • • • • • • • • • • • • 6.3k | ||
| unit does not reset normally after 3 min- | board (Insert failure) | 30 | • • • • • • • • • • • • 4.3k | ||
| utes. (The unit returns to normal opera- | Breaking of wire or contact | 40 | • • • • • • • • • • •3.0k | ||
| tion, if it has been reset normally.) | failure of thermistor wiring | If you put force on (draw or bend) the lead wire | |||
| Constantly detected during cooling, | Defective indoor controller | while measuring resistance value of thermistor, | |||
| drying, and heating operation. | board | breaking of wire or contact failure can be | |||
| Short: 90 |
| detected. |
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P1 | Open: |
| Check contact failure of connector (CN20) on | |||
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| the indoor controller board. Refer to | ||||
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| Turn the power on again and check restart | |||
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| after inserting connector again. | |||
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| Check room temperature display on remote | |||
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| controller. |
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| Replace indoor controller board if there is | |||
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| abnormal difference with actual room | |||
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| temperature. |
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| Turn the power off, and on again to operate | |||
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| after check. |
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| Pipe temperature thermistor/Liquid | Defective thermistor | – Check resistance value of thermistor. | |||
| (TH2) | characteristics | For characteristics, refer to (P1) above. | |||
| The unit is in | Contact failure of connector | Check contact failure of connector (CN44) on | |||
| prevention mode if short/open of | (CN44) on the indoor controller | the indoor controller board. Refer to | |||
| thermistor is detected. Abnormal if the | board (Insert failure) | Turn the power on and check restart after | |||
| unit does not reset normally after 3 min- | Breaking of wire or contact | inserting connector again. | |||
| utes. (The unit returns to normal opera- | failure of thermistor wiring | Check pipe <liquid> temperature with remote | |||
| tion, if it has been reset normally.) | Defective refrigerant circuit is | controller in test run mode. If pipe <liquid> | |||
P2 | Constantly detected during cooling, | causing thermistor tempera- | temperature is extremely low (in cooling | |||
drying, and heating (except defrosting) | ture of 90 | mode) or high (in heating mode), refrigerant | ||||
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| operation. | circuit may have defect. | ||||
| Short: 90 | Defective indoor controller | Check pipe <liquid> temperature with remote | |||
| Open: | board | controller in test run mode. If there is extremely | |||
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| difference with actual pipe <liquid> temperature, | |||
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| replace indoor controller board. | |||
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| Turn the power off, and on again to operate | |||
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| after check. |
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| Contact failure of drain float switch (CN4F) | Contact failure of connector | Check contact failure of float switch connec- | |||
| Extract when the connector of drain float | (Insert failure) | tor. |
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P4 | switch is disconnected. |
| Turn the power on again and check after | |||
( and of connector CN4F is not |
| inserting connector again. | ||||
(5701) |
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Defective indoor controller | Operate with connector (CN4F) | |||||
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| Constantly detected during operation. | board | Replace indoor controller board if abnormality | |||
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| reappears. |
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| Drain overflow protection operation | Malfunction of drain pump | Check if drain pump works. | |||
| Suspensive abnormality, if drain float | Defective drain | Check drain function. |
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| switch is detected to be underwater for | Clogged drain pump |
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| 1 minute and 30 seconds continuously | Clogged drain pipe |
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| with drain pump on. | Defective drain float switch | Remove drain float switch connector CN4F | |||
| Turn off compressor and indoor fan. | Catch of drain float switch or | and check if it is short (Switch On) with the | |||
| Drain pump is abnormal if the condition | malfunction of moving parts | moving part of float switch UP, or OPEN with | |||
| above is detected during suspensive | cause drain float switch to be | the moving part of float switch down. | |||
| abnormality. | detected under water (Switch | Replace float switch if it is short with the | |||
P5 | Constantly detected during drain pump | On) | moving part of float switch down. | |||
| operation. | Defective | Replace indoor controller board if it is short- | |||
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| board | circuited between - | of the drain float | ||
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| switch connector CN4F and abnormality | |||
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| reappears. |
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| It is not abnormal if there is no problem about | |||
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| the | ~ | ||
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| Turn the power off, and on again to operate | |||
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| after check. |
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