What does Samsung DVM error code C4 mean?

C4 on Samsung DVM systems indicates an indoor unit heat exchanger temperature sensor fault. The thermistor measuring the indoor coil temperature has failed or is disconnected. Measure the thermistor resistance at room temperature — it should be approximately 10kΩ for Samsung standard thermistors. Replace the sensor if it reads OL or near zero.

How do I read Samsung DVM fault codes without a service tool?

Samsung DVM outdoor units display fault codes on the 7-segment LED display on the main PCB. Access by opening the outdoor unit control box cover. For indoor units, the fault code is displayed on the indoor unit PCB or transmitted to the wired remote controller display. Use the Samsung DVM SAMSUNG AC tool (Android/iOS app) for a more comprehensive fault readout via IR or Wi-Fi connection.

What causes Samsung DVM error code E731?

E731 on Samsung DVM systems indicates a PCB EEPROM fault in the outdoor unit. This is typically caused by a power surge or corrupted memory. Try powering the outdoor unit off for 10 minutes and restarting. If E731 persists, the outdoor unit main PCB requires replacement. Ensure stable power supply voltage (within ±10% of rated voltage) to prevent recurrence.

How do I set the Samsung DVM S outdoor unit address?

Samsung DVM S outdoor units do not require manual address setting — the system auto-configures unit addresses via the communication bus. However, if multiple outdoor units are connected in a multi-unit configuration, verify the DIP switch or rotary switch settings on each outdoor unit PCB match the Samsung commissioning guide for your configuration. Duplicate addresses cause E301 communication faults.

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Common Samsung HVAC Error Codes

Indoor heat exchanger thermistor fault

E731

Outdoor PCB EEPROM fault — power cycle or replace PCB

E301

Communication fault — check wiring and addresses

High pressure protection — check outdoor coil and refrigerant

E416

Discharge temperature sensor fault

Frequently Asked Questions — Samsung HVAC

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