Brand: SHARP
Category: Home Appliances
Document Type: Parts/Service
Language: EN
Parts/Service for AY-XP9LSR / AE-X9LSR
Uploaded: Nov. 21, 2025, 7:09 p.m.
Manual Publish Date: 2005-01-01
Chapter 2: Explanation of Circuit and Operation
1. Block Diagrams
Provides an overview of the indoor and outdoor unit systems, detailing the interaction between the CPU, various circuits (power supply, sensors, control signals), and external components like the fan motor, compressor, and remote controller.
Chapter 3: Function and Operation of Protective Procedures
1. Protection Device Functions and Operations
Details various protection mechanisms such as compressor restart control, freeze prevention (indoor unit heat exchanger, outdoor unit 2-way valve), overheat shutdowns (indoor/outdoor heat exchangers, compressor discharge), dehumidifying operation stop, and DC overcurrent error.
Chapter 5: Disassembling Procedure
Outlines the step-by-step process for disassembling both the indoor and outdoor units, including specific instructions for removing components like the Plasmacluster unit and compressor covers.
Troubleshooting and error codes
| Function | Description | Detection period | Reset condition | Self-diagnosis result display | |
|---|---|---|---|---|---|
| Indoor unit error display | Outdoor unit error display | ||||
| 1. Indoor unit fan lock | Operation stops if there is no input of rotation pulse signal from indoor unit fan motor for 1 minute. | When indoor unit fan is in operation | Operation OFF or ON *2 | Yes | None |
| 2. Indoor unit fan rotation speed error | Operation stops if rotation pulse signal from indoor unit fan indicates abnormally low speed (about 300 rpm or slower). | When indoor unit fan is in operation | Operation OFF or ON *2 | Yes | None |
| 3. Indoor unit freeze prevention | Compressor stops if temperature remains below 0°C for 4 minutes. | When in cooling or dehumidifying operation | Automatic reset when heat exchanger temperature rises above freeze prevention temperature (2°C or higher) | None | None |
| 4. 2-way valve freeze prevention | Compressor stops if temperature of outdoor unit 2-way valve remains below 0°C for 10 continuous minutes during cooling or dehumidifying operation. | When in cooling or dehumidifying operation | Automatic reset when temperature of 2-way valve rises above 10°C. | None | Yes |
| 5. Indoor unit heat exchanger overheat shutdown | Operating frequency lowers if indoor unit heat exchanger temperature exceeds overheat temperature during heating operation. Compressor stops if indoor unit heat exchanger temperature exceeds overheat temperature for 60 seconds at minimum frequency. Overheat temperature setting value indoor unit heat exchanger thermistor temperature: about 45 to 54°C | When in heating operation | Automatic reset after safety period (180 sec). | None | Yes |
| 6. Outdoor unit heat exchanger overheat shutdown | Operation frequency lowers if outdoor unit heat exchanger temperature exceeds about 55°C during cooling operation. Compressor stops if outdoor unit heat exchanger temperature exceeds about 55°C for 120 seconds at minimum frequency. | When in cooling or dehumidifying operation | Automatic reset after safety period (180 sec). | None | Yes |
| 7. Compressor discharge overheat shutdown | Operating frequency lowers if temperature of compressor chamber thermistor (TH1) falls below about 110°C. Compressor stops if temperature of compressor chamber thermistor (TH1) remains at about 110°C (for 120 seconds in cooling operation, or 60 seconds in heating operation) at minimum frequency. | When compressor is in operation | Automatic reset after safety period (180 sec). | None | Yes |
| 8. Dehumidifying operation temporary stop | Compressor stops if outside air temperature thermistor is lower than about 16°C during dehumidifying operation. | When in dehumidifying operation | Automatic reset when outside air temperature rises above 16°C. | None | Yes |
| 8. DC overcurrent error | Compressor stops if electric current of about 25 A or higher flows in IPM. | When compressor is in operation | Operation OFF or ON | Yes *1 | Yes |