- The main board detects the output of solenoid valve - Current observation of fixed frequency compressor power supply - Two-wire frequency conversion board detection
- Electric valve stuck valve repair - Home air-conditioning electronic expansion valve drive detection
- Single/double damper detection - Damper heating wire power display - Three-wire fan detection - Four-wire fan detection
- The main board to inverter board output signal detection - 2K/5K/10K temperature probe detection
- Compressor short circuit buzzer alarm, Other compressor fault buzzer alarm
- Air-conditioner three wire fan frequency conversion motor drive
- Range hood driven by three wire variable frequency motor
- The compressor cylinder clamping instrument will make three attempts to start, and if it fails to start, the buzzer will give an alarm.