Brand: SHARP
Category: Home Appliances
Document Type: Manual
Language: EN
Manual for AH-X079E/X099E
Uploaded: Nov. 21, 2025, 8:19 p.m.
Warranty Information
Warranty information is not explicitly detailed in the provided pages.
INDOOR UNIT FUNCTIONS
Temperature Adjustment:
- Normal Control: Adjusts frequency by one rank to get closer to the set value based on temperature zones.
- Integral Control: Adjusts frequency by one rank when the temperature zone has been stable for a set time.
- Initial Control: Determines initial frequency based on the difference between the set temperature and room temperature.
Indoor Fan Control: Uses thermistor to control cold air blowing, indoor fan, and overheating prevention.
Defrost Operation (Outdoor Unit): Begins during heating under specific conditions; stops when outdoor heat exchanger temperature rises or defrosting time exceeds limits.
Frequency Control: Manages operating frequency to prevent overheating, discharge overheating, and indoor heat exchanger freezing.
Troubleshooting and error codes
| NO | Function | Description | Operation | Detection time | Restart condition | Restart times | Self diagnostic display |
|---|---|---|---|---|---|---|---|
| Indoor | Outdoor | ||||||
| 1 | Indoor fan lock | Stops operation if no revolution pulse signal is input from the indoor fan motor for one minute. | When indoor fan is revolving | Operation OFF | No limit | Yes | No |
| 2 | Indoor freezing guard | Stops operation if the revolution pulse signal from the indoor fan indicates low rpm (approximately 300 rpm or less). | During cooling and dry | Automatically restarts when the exchange temperature rises above the freezing prevention temperature (above 2°C). | No limit | No | No |
| 3 | Indoor overheating control | Lowers the operating frequency if the temperature of the indoor heat exchanger rises above the overheating temperature during heating. Stops the compressor if the temperature stays above the overheating temperature for 1 minute at 35Hz or less. Set values for overheating temperature During normal operation: 46°C to 54°C During full power operation: 49°C to 58°C | During heating | Automatically restarts when the exchange temperature goes below the overheating temperature. | No limit | No | No |
| 4 | DC overcurrent | Stops the compressor if a current of approximately 30A or more flows in the power transistor module. Also stops the compressor if the temperature of the power transistor module is exceeds 105°C. | During compressor operation | Automatically restarts after safety time (170 seconds) | 4 times | Yes | Yes |
| 5 | AC overcurrent | Lowers the operating frequency if the compressor AC current exceeds set valve(). Stops the compressor if the current exceeds at 40Hz or less set valve(※). | During compressor operation | Automatically restarts after safety time (170 seconds) | 4 times | Yes | Yes |
| 6 | Compressor lock | Stops the compressor if the compressor AC current exceeds 3A immediately after activating the compressor (at 10 to 30Hz). | Immediately after compressor activation. | Automatically restarts after safety time (170 seconds) | 4 times | Yes | Yes |
| 7 | Compressor overheating control | Lowers the operating frequency if the temperature of the compressor chamber thermistor (TH1) rises above 105°C. Stops the compressor if the thermistor stays above 105°C for 1 minutes at 35Hz or less. | During compressor operation | Automatically restarts after safety time (170 seconds) | No limit | No | No |
| 8 | Compressor high temperature error | Stops the compressor if the compressor chamber thermistor is above 114°C. (Or when TH1 shorts) | During operation | Automatically restarts when thermistor (TH1) temperature falls below 100°C (approximately 30 minutes) | 4 times | Yes | Yes |
| 9 | Outdoor heat exchanger overheating control | Lowers the operating frequency if the temperature of the outdoor heat exchanger rises above 57°C during cooling. Stops the compressor if the temperature stays above 57°C for 1 minute at 35 Hz or less. | During compressor operation | Automatically restarts after safety time (170 seconds) | No limit | No | No |
| 10 | Outdoor thermistor short | Stops the compressor if an outdoor thermistor (excluding TH1) shorts. | When compressor is activated | Automatically restarts after safety time (170 seconds) | 4 times | Yes | Yes |
| 11 | Outdoor thermistor open | Stops the compressor if the circuit of an outdoor thermistor breaks. | When compressor is activated | Automatically restarts after safety time (170 seconds) | 4 times | Yes | Yes |
| 12 | AC abnormal current error | Stops the compressor if if the operating frequency is above 85 Hz and the compressor current is below 1.0 A. | During compressor operation | Automatically restarts after safety time (170 seconds) | 4 times | Yes | Yes |
| 13 | Serial signal | Turns the compressor relay off if the indoor unit does not receive a serial signal from the outdoor unit for 8 minutes. | During operation | Automatically restarts less than 8 minutes after operation stops | No limit | Yes | — |
| 14 | Power factor module (Active filter) error | Stops the compressor if the outdoor unit does not receive a serial signal from the indoor unit for 30 seconds. When an power factor module error input is detected. | During compressor operation | Restarts after reception of serial signal | No limit | — | Yes |