FILE NO.
(1)After servicing, push the [
] button to return to the normal mode.
(2)After servicing by the check code, turn off breaker of the power supply, and turn on breaker of the power supply again so that memory in the microcomputer returns the initial status. However, the check codes are not deleted even if the power supply is turned off because they are stored in the fixed memory.
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Block distinction |
| Operation of diagnosis function |
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| Judgment and action |
Check | Block | Check | Cause of operation |
| Air conditioner | Remarks |
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code | code |
| status |
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| Indoor |
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| Operation | Displayed when | 1. Check the room temp. sensor. | ||
| P.C. |
| tion of the room |
| continues. | error is detected. | 2. When the room temp. sensor is | |
| board |
| temperature sensor |
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| normal, check P.C. board. |
| etc. |
| (TA sensor). |
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| Being out of place, |
| Operation | Displayed when | 1. Check heat exchanger sensor. | |
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| disconnection, |
| continues. | error is detected. | 2. | When heat exchanger sensor is |
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| or migration of heat |
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| normal, check P.C. board. |
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| exchanger sensor |
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| (TC sensor) |
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| Lock of indoor fan or trouble |
| All off | Displayed when | 1. Check P.C. board. | |
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| on the indoor fan circuit |
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| error is detected. | 2. | When P.C. board is normal, check |
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| the motor. |
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| Not |
| Trouble on other indoor |
| Operation | Displayed when | Replace P.C. board. | |
| displayed |
| P.C. boards |
| continues. | error is detected. |
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| Connec- |
| Return serial signal is not |
| Operation | Flashes when | 1. | When the outdoor unit never |
| ting cable |
| sent to indoor side from |
| continues. | trouble is |
| operate: |
| and serial |
| operation started. |
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| detected on |
| (1) Check connecting cable, and |
| signal |
| (1) Defective wiring of |
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| return serial |
| correct if defective wiring. |
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| connecting cable |
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| signal, and |
| (2) Check 25A fuse of inverter |
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| (2) Operation of |
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| normal status |
| P.C. board |
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| compressor thermo. |
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| when signal is |
| (3) Check 3.15A of inverter |
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| Gas shortage |
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| reset. |
| P.C. board. |
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| Gas leak |
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| 2. | To display [Other] block during |
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| operation, check compressor |
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| thermo. operation and supply gas |
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| (check gas leak also). |
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| 3. | Unit operates normally during |
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| check. |
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| If Return serial signal does not |
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| stop between 2 and 3 of the |
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| indoor terminal block, replace |
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| inverter P.C. board. |
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| If signal stops between indoor |
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| terminal block 2 and 3, replace |
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| indoor P.C. board. |
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| Operation command signal |
| Operation | Flashes when | If return serial signal does not stop | |
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| is not sent to outdoor side. |
| continues. | trouble is | between indoor terminal block 2 | |
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| detected on | and 3, replace inverter P.C. board. | |
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| operation | If signal stops between indoor | |
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| command signal, | terminal block 2 and 3, replace | |
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| and normal status | indoor P.C. board. | |
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| when signal is |
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| reset. |
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– 63 –