Symptom |
| Outdoor unit operates. (The compressor operates at reduced frequency.) | ||
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Display | Detecting method | Detecting method | Check points | |
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d8 | Frequency drop by current | When the outdoor unit input current exceeds 22.5 A, the compressor |
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(d8) | protection | operates at reduced frequency. |
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d9 | Frequency drop by overload | When the compressor load exceeds the specified value, the compres- | These symptoms do not mean any | |
(d9) | protection | sor operates at reduced frequency. | ||
abnormality of the product, but check the | ||||
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| Frequency drop by high pres- | When indoor pipe temperature exceeds 55˚C during heating, the com- | following points. | |
d7 | sure protection | pressor operates at reduced frequency. | • Air filter clogging. | |
(d7) |
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| • Amount of gas. | |
Frequency drop by defrosting | When the indoor pipe temperature falls to 6˚C or below during cooling, | |||
• Short cycle of indoor/outdoor air flow. | ||||
| in cooling | the compressor operates at reduced frequency. |
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d6 | Frequency drop by discharge | When the discharge temperature exceeds 110˚C, the compressor oper- |
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(d6) | temperature protection | ates at reduced frequency. |
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d3 | Frequency drop by high pres- | When the high pressure exceeds 2.75MPa (28 | • Amount of gas. | |
(d3) | sure switch protection | pressor operates at reduced frequency. In addition, the fan speed | • Outdoor unit air passage. | |
| changes. |
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d1 |
| When the state with low discharge temperature of which 50˚C in COOL | Check the amount of gas. | |
Low discharge temperature | • Replace the outdoor controller board. | |||
(d1) | protection | and 48.4 or less in HEAT for 20 minutes, the compressor operates con- | • Check the contact of LEV board connec- | |
| tinuously. | tors. | ||
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Symptom |
| Outdoor unit operates. |
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Display | Detecting method | Detecting method | Check points | |
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e7 | Defrost thermistor abnormality | When a short or open circuit occurs in the defrost thermistor during | • Defrost thermistor characteristic. | |
(E7) | heating | • Contact of P. C. board connectors. | ||
| * In this case, the compressor continues to operate. | |||
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h4 | Power factor detection abnor- | When the compressor power factor cannot be detected | • Compressor wiring. | |
(h4) | mality | * In this case, the compressor keeps running. | ||
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