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Systematic guide to troubleshoot specific error codes by checking components and causes.
Troubleshooting steps for water flow abnormalities in heating, cooling, DHW production, and defrost cycles.
Addresses heat exchanger freezing issues due to low temperatures or abnormal thermistor readings, checking multiple components.
Diagnoses zero cross detection and high pressure problems, checking power supply, water, and refrigerant circuits.
Resolves backup heater overheating and PCB defects, checking water circuits, power supply, and main PCB.
Troubleshoots high/low pressure switch issues and abnormal suction pressure, checking refrigerant circuit and components.
Addresses compressor overheat, startup defects, and fan motor malfunctions, checking refrigerant circuit, PCB, and motor.
Resolves power input overvoltage and electronic expansion valve malfunctions, checking components and power supply.
Details procedures for checking compressor operation (auditive, mechanical, electrical, insulation) and performing repairs.
Details checking procedures for flow and water pressure sensors, including electrical tests and continuity checks.
Details checking procedures for the outdoor unit fan motor, including mechanical, electrical, and resistance checks.
Covers checking procedures for high and low pressure switches, including refrigerant pressure tests and resistance measurements.
Covers electrical checks for the refrigerant pressure sensor, measuring voltage against pressure values.
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