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General| Brand | Fujitsu |
|---|---|
| Model | Airstage VR-II UTP-RU04BH |
| Category | Air Conditioner |
| Language | English |
Checks PCB lighting status and LED indicators for errors on outdoor and indoor units.
Details compressor operation, including start/stop conditions and various operating modes.
Explains how heat exchanger capacity is controlled using 4WV, fan, and EEV based on target pressures.
Explains the control mechanism of electronic expansion valves.
Lists and explains various protective functions of the system.
Describes various discharge temperature protection levels and their operations.
Details high pressure protection functions, start conditions, release conditions, and operations.
Explains low pressure protection functions, start conditions, release conditions, and operations.
Explains master control functions, including mode settings and operation for different connectable types.
Explains the control mechanism of electronic expansion valves.
Introduces abnormal operation and error code display mechanisms.
Explains the structure of error codes and how they are indicated on different devices.
Provides an index linking error codes to their descriptions and troubleshooting steps.
Continues the index of error codes, linking them to descriptions and troubleshooting steps.
Categorizes system conditions based on outdoor unit errors and their corresponding trouble levels.
Guides on troubleshooting specific error codes related to indoor unit communication errors.
Provides steps to troubleshoot communication errors between outdoor units.
Guides on troubleshooting communication errors related to the outdoor unit network.
Details troubleshooting steps for outdoor unit network communication errors.
Provides steps for troubleshooting indoor unit network communication errors.
Guides on troubleshooting errors related to the number of indoor units in the system.
Details troubleshooting steps for transmission PCB connection errors in indoor units.
Guides on troubleshooting communication errors between the controller and indoor units.
Details troubleshooting for address duplication errors in wired remote controller systems.
Guides on troubleshooting address setting errors in wired remote controller systems.
Details troubleshooting for outdoor unit auto address setting errors.
Guides on troubleshooting signal amplifier auto address errors.
Details troubleshooting for connection unit number errors in indoor units within wired remote systems.
Guides on troubleshooting connection unit number errors related to remote controllers.
Details troubleshooting for indoor unit power frequency abnormalities.
Explains troubleshooting for errors related to indoor unit PCB model information.
Guides on troubleshooting indoor unit EEPROM access errors.
Details troubleshooting for communication errors in WRC microcomputer circuits of indoor units.
Guides on troubleshooting errors related to the indoor unit inlet air temperature sensor.
Details troubleshooting for errors related to the indoor unit heat exchanger inlet temperature sensor.
Guides on troubleshooting errors related to the indoor unit heat exchanger outlet temperature sensor.
Details troubleshooting for errors related to the indoor unit fan motor 1 rotation speed.
Guides on troubleshooting errors related to EEV1 (Expansion Valve 1).
Guides on troubleshooting errors related to reverse phase or missing phase wires in outdoor units.
Details troubleshooting for outdoor unit EEPROM access errors.
Guides on troubleshooting communication errors with the inverter.
Details troubleshooting for EEPROM data corruption errors.
Guides on troubleshooting general inverter errors.
Details troubleshooting for inverter PCB short interruption errors.
Guides on troubleshooting errors related to rush current limiting resistor temperature rise.
Details troubleshooting for parallel communication errors with the outdoor unit transmission PCB.
Guides on troubleshooting errors related to the discharge temperature sensor 1.
Details troubleshooting for errors related to the compressor temperature sensor 1.
Guides on troubleshooting errors related to the Heat Ex.1 gas temperature sensor.
Details troubleshooting for errors related to the Heat Ex.1 liquid temperature sensor.
Guides on troubleshooting errors related to the Heat Ex.2 gas temperature sensor.
Details troubleshooting for errors related to the Heat Ex.2 liquid temperature sensor.
Guides on troubleshooting errors related to the outdoor temperature sensor.
Details troubleshooting for errors related to the suction gas temperature sensor.
Guides on troubleshooting errors related to the heat sink temperature sensor.
Details troubleshooting for errors related to the sub-cool heat exchanger gas outlet temperature sensor.
Guides on troubleshooting errors related to the liquid pipe temperature sensor 1.
Details troubleshooting for errors related to the liquid pipe temperature sensor 2.
Guides on troubleshooting abnormalities related to the current sensor 1.
Details troubleshooting for discharge pressure sensor errors.
Guides on troubleshooting inverter compressor start-up errors.
Details troubleshooting procedures for trip detection errors.
Guides on troubleshooting compressor motor loss of synchronization errors.
Details troubleshooting for outdoor unit fan motor lock errors.
Guides on troubleshooting abnormal outdoor unit fan motor temperatures.
Details troubleshooting for abnormal outdoor unit fan motor drivers.
Guides on troubleshooting high pressure abnormal conditions.
Details troubleshooting for high pressure protection 1 errors.
Guides on troubleshooting low pressure abnormal conditions.
Provides troubleshooting steps for issues that do not generate specific error codes.
Details troubleshooting steps when an indoor unit has no power.
Guides on troubleshooting steps when the outdoor unit has no power.
Details troubleshooting steps when the RB unit has no power.
Guides on troubleshooting when the unit is powered on but not operating.
Details troubleshooting steps when the unit is not cooling or heating.
Guides on troubleshooting steps when the outdoor air unit has no power.
Provides precautions and step-by-step procedures for compressor removal, including panel, box, and valve operations.
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