10-4-3. Caution at Servicing
(1)After servicing, push the START/STOP 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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| Table |
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Block distinction |
| Operation of diagnosis function |
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Check |
| Check |
| Air |
| Judgment and action |
Block | Cause of operation | conditioner | Remarks |
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code | code |
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| status |
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| Indoor P.C. |
| Operation | Displayed when | 1. Check the room temp. sensor. | |
| board etc. |
| disconnection of the room | continues. | error is detected. | 2. When the room temp. sensor is |
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| temperature sensor |
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| normal, check P.C. board. | |
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| (TA sensor). |
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| Being out of place, | Operation | Displayed when | 1. Check heat exchanger sensor. |
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| disconnection, short- | continues. | error is detected. | 2. When heat exchanger sensor is |
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| circuit, or migration of |
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| normal, check P.C. board. | |
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| heat exchanger sensor |
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| (TC sensor) |
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| Lock of indoor fan or | All off | Displayed when | 1. Check P.C. board. |
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| trouble on the indoor fan |
| error is detected. | 2. When P.C. board is normal, check |
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| circuit |
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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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| Connecting |
| Return serial signal is not | Operation | Flashes when | 1. When the outdoor unit never |
| cable and |
| sent to indoor side from | continues. | trouble is detected | operate: |
| serial signal |
| operation started. |
| on Return serial | (1) Check connecting cable, and |
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| signal, and normal | |
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| (1) Defective wiring of |
| correct if defective wiring. | |
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| status when signal | ||
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| connecting cable |
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| is reset. | (2) Check 25A fuse of inverter P.C. | |
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| (2) Operation of |
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| board. |
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| compressor thermo. |
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| (3) Check 3,15A of inverter P.C. |
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| Gas shortage |
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| 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 check. |
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| If Return serial signal does not stop |
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| between indoor terminal board 2 and |
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| 3, replace inverter P.C. board. |
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| If signal stops between indoor |
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| terminal board 2 and 3, replace |
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| indoor P.C. board. |
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| Operation command | Operation | Flashes when | If Return serial signal does not stop |
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| signal is not sent to | continues | trouble is detected | between indoor terminal board 2 and 3, |
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| outdoor side. |
| on Operation | replace inverter P.C. board. |
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| command signal, | If signal stops between indoor terminal |
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| and normal status | board 2 and 3, replace indoor P.C. |
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| when signal is | board. |
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| reset. |
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