HAIER AS35XCAHRA (01) PDF Document

The service information for the HAIER AS35XCAHRA is designed for experienced repair technicians only and is not intended for use by the general public. Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product by anyone else could result in serious injury or death.

The model name AS35XCAHRA is broken down as follows:

A: Indoor unit

S: Type of indoor unit (wall-mounted)

35: Nominal cooling capacity (12000 BTU/h)

X: Platform of indoor units (X platform)

C: 40X Platform

A: Version number

H: Indoor units

R: DC inverter

A: Apply to T1; 220~240V 50HZ/1ph

Before installation, perform the following embedded wire checks:

1. Check that the embedded wire diameter is suitable for the power supply requirements.

2. Ensure there are four roots for the embedded wire: L/N/COM/GND. GND is necessary to protect against thunder or high voltage waves from the power grid.

3. Use a multi-meter to test for short circuits among the four wire roots, ensuring no short circuits are present.

Warning:

• Always disconnect the power cable plug from the socket before disassembling the equipment for repair. Working on a powered unit can cause an electrical shock.

• If power must be supplied for repair or inspection, do not touch any electrically charged sections.

• If refrigerant gas discharges during repair, do not touch it as it can cause frostbite.

• When disconnecting compressor pipes, release the refrigerant gas completely in a well-ventilated place first to prevent injury from gas or oil discharge.

• If refrigerant gas leaks, ventilate the area immediately. The gas can generate toxic gases when it contacts flames.

• The step-up capacitor supplies high-voltage. Be sure to discharge it completely before repair work to avoid electrical shock.

• Do not start or stop the unit by plugging or unplugging the power cable, as this can cause electrical shock or fire.

• Do not repair electrical components with wet hands.

• Do not clean the unit by splashing water on it.

• Ensure proper grounding, especially in humid or wet places.

• Turn off the power switch and unplug the power cable when cleaning the unit.

• Do not tilt the unit when removing it to prevent water spillage.

• Ensure the refrigerating cycle section has cooled down sufficiently before starting repair work to avoid burns.

• Use welders in a well-ventilated area to prevent oxygen deficiency.

Warning:

• Be sure to use parts listed in the service parts list of the applicable model and appropriate tools. Never attempt to modify the equipment.

• When relocating, ensure the new installation site has sufficient strength to support the equipment’s weight.

• Use an exclusive power circuit and follow all electrical standards and regulations.

• Use the specified cable for connections between indoor and outdoor units, ensuring connections are secure.

• Ensure the terminal cover is properly mounted to prevent electrical shock or fire.

• Do not damage or modify the power cable.

• Do not mix any gas other than the specified refrigerant (R32) in the system.

• If refrigerant gas leaks, locate and repair the leak before charging. After charging, confirm there are no leaks.

Caution:

• Check that all parts and wires are mounted and connected properly and securely.

• If the installation platform or frame is corroded, replace it.

• Check the grounding and repair if necessary.

• Measure the insulation resistance; it should be 1 M ohm or higher.

• Check the drainage of the indoor unit to ensure it’s working correctly.

Inspection after Repair:

• Make sure the power cable plug is clean and not loose, then insert it fully into a power outlet.

• If the power cable or lead wires have scratches or have deteriorated, replace them.

• Do not use a joined power cable or extension cable, or share the outlet with other appliances.

The HAIER AS35XCAHRA includes the following features:

• I FEEL: Controls temperature through the remote controller to accurately perceive room temperature.

• Eco Sensor: Detects room conditions and human activities to switch working modes for higher energy efficiency.

• Self-Clean: Freezes the evaporator with air moisture and then melts away dirt, ensuring clean air output.

• 56°C Steri-Clean: Kills bacteria and viruses by heating the evaporator to 56°C for 30 minutes.

• UVC PRO: Inhibits bacteria reproduction and sterilizes viruses.

• Wi-Fi Control: Use the Haier hOn App on a smart device to control the system from anywhere.

• 2-way piping design: The pipe can exit from either the left or right side.

• Super match: One outdoor unit can be matched with two or more indoor units.

• DIY auto mode: Adjusts to the last fixed operation mode automatically.

• Turbo mode: Provides quick cooling or heating.

• Auto restart: Automatically returns to previous operation conditions after a sudden power blackout.

• 24 hours timer: Set the timer to turn the unit on, off, from on to off, or from off to on.

• Integrative valve cover: The valve cover is integrative.

• Double 8 display: The display is in a Double 8 mode.

• Coanda Plus Airflow: Delivers cool air further, faster, and stronger for even distribution.

• Easy to Clean: Allows for easy removal of the fan and filter for deep cleaning.

• Easy to disassemble: Simplified structure for easy disassembly of core components like PCB, motor, and fan for maintenance.

NOMINAL DISTRIBUTION SYSTEM VOLTAGE

NOMINAL CAPACITY and NOMINAL INPUT

TECHNICAL SPECIFICATIONS

TECHNICAL SPECIFICATIONS-PARTS

Note: The data are based on the conditions shown in the table below:

The connectors on the control PCB (PCB(1)) have the following functions:

Connectors:

• CN9: Connector for fan motor

• CN6: Connector for heat exchanger thermistor and Room temperature thermistor

• CN5, CN5′: Connector for UP&DOWN STEP motor

• CN11, CN11′: Connector for RIGHT&LEFT STEP motor

• CN21 (white line), CN52(black line): Connector for indoor terminal N and L

• CN8: Connector for display board

• CN23 (red line): Connector for communication between the indoor board and the outdoor board

• CN36: Connector for long-range control

• CN34: Connector for wifi Module

• CN2: Connector for wired controller

• CN51: Connector for room card

Other designations on Indoor Control PCB:

• CN14: Connector for Forced operation ON / OFF switch

• FUSE1: Fuse 3.15A/250VAC

• SW1: Connector for Forced operation ON / OFF switch

• SW2: Select remote code A or B, Select room card able or disable, Select 23, 26, 33, and 35

• RV1: Varistor

Automatic Operation:

The system determines the running mode based on the current room temperature (Tr) versus the set temperature (Ts). If Tr ≥ Ts-3°C, it selects Cooling Mode. If Tr < Ts-3°C, it selects Heating Mode. It can automatically switch between cooling, fan, and heating modes after 15 minutes based on ambient temperature changes.

Cooling Operation Mode:

• Temperature control range: 16°C – 30°C.

• The compressor runs when the room temperature is above the set temperature. The indoor fan operates at the set speed.

• Automatic airflow speed adjusts based on the temperature difference (high, medium, low). A 3-minute delay prevents rapid switching from high to low speed.

• Defrosting function prevents frosting on the indoor heat exchanger.

Dehumidifying Mode:

• Temperature control range: 16°C – 30°C.

• Control features are based on temperature differentials to manage compressor frequency and fan speed for effective dehumidification.

• Automatic wind speed control adjusts based on room temperature (high, medium, low, light).

Heating Operation Mode:

• Temperature control range: 16°C – 30°C.

• The compressor turns on when the room temperature plus 0.5°C is less than or equal to the set temperature. The indoor fan will be in cold air proof mode.

• Automatic fan speed adjusts based on the temperature difference.

• Cold air proof operation prevents cold air from blowing out at the start of the heating cycle.

Strength (Turbo) Operation:

The system enters a high-power mode for rapid cooling or heating after receiving the ‘strength signal’.

Mute Operation:

The system operates at a slight airflow speed to reduce noise. This mode is not available in dehumidifying or fan-only modes.

Dormant (Sleep) Operation:

• In cooling/dehumidifying mode, the set temperature increases by 1°C after the first hour, and another 1°C after the second hour, then holds for 6 hours before shutting down.

• In heating mode, the set temperature decreases by 2°C after the first hour, and another 2°C after the second hour. After 3 more hours, it will rise by 1°C and hold for 3 hours before shutting down.

• Indoor fan speed adjusts to a lower setting if it was on high or medium.

Urgent On/Off Input:

• Press for less than 5 seconds: The buzzer will ring. The system enters urgency operation (fully automatic) when the key is loosened.

• Press for 5 to 10 seconds (from off mode): The system starts the test operation.

• Press for 10 to 15 seconds (from off mode): The display shows the last malfunction code.

• Press while in operation: The system will stop.

Test Operation:

During test operation, the inlet temperature sensor is disabled. The indoor fan and air direction motor work synchronically at high speed cooling. It sends a fixed ambient temperature (30°C) and coil temperature (16°C) to the outdoor unit. Defrost and temperature controls are disabled. The test operation will finish in 30 minutes or can be stopped by a command from the remote control.

An abnormality is detected when the thermistor input is more than 4.92V or less than 0.08V during compressor operation. The following error codes may be displayed:

• Indoor Display: E1 (Room temperature sensor failure), E2 (Heat-exchange sensor failure)

• Outdoor Display: LED1 flash 10 times (Defrost temperature sensor failure), flash 11 times (Suction temperature sensor failure), flash 12 times (Ambient temperature sensor failure), flash 13 times (Discharge temperature sensor failure)

Supposed Causes:

• Faulty connector connection

• Faulty thermistor

• Faulty PCB

Troubleshooting Steps:

Caution: Be sure to turn off the power switch before connecting or disconnecting connectors to prevent parts damage.

1. Check the connector connection. If it’s not normal, correct the connection. If it is normal, proceed to the next step.

2. Perform a thermistor resistance check. To do this, remove the thermistor connector from the PCB and measure its resistance with a tester. Compare the reading to the normal temperature/resistance values for your model. If the resistance is not normal, replace the thermistor. If it is normal, proceed to the next step.

3. If the connection and thermistor are normal, the issue is likely with the indoor unit PCB. Replace the indoor unit PCB.

An EEPROM error is indicated when the data of the EEPROM is erroneous or damaged. The following error codes may be displayed:

• Indoor Display: E4 (Indoor EEPROM error)

• Outdoor Display: F12 (Outdoor EEPROM error; Outdoor LED1 flashes 1 time)

Supposed Causes:

• Faulty EEPROM data

• Faulty EEPROM

• Faulty PCB

Troubleshooting:

Caution: Be sure to turn off the power switch before handling components.

The solution is to replace the indoor or outdoor mainboard, depending on which unit is reporting the error.

An E14 error indicates an indoor fan motor malfunction, which occurs when the detected rotation feedback signal is not received for 2 minutes.

Supposed Causes:

• Operation halt due to a broken wire inside the fan motor or its lead wires.

• Detection error due to a faulty indoor unit PCB.

• Damaged connecting terminal.

How to check the DC Fan Motor:

Notes: The A/C is electrifying. Do not pull out or insert the motor terminals while powered on, or the motor could be damaged.

1. Check connector connection: Ensure the connector is secure on the PCB and in the joint box.

2. Check motor power supply voltage output: Measure between pins 1 and 4.

3. Check motor control voltage: Measure between pins 4 and 5 (should be 15 VDC).

4. Check rotation command voltage output: Measure between pins 4 and 6 (should be 1~6 VDC).

5. Check rotation pulse input: Measure between pins 4 and 7.

1. Release the tape securing the panel.

2. Hold the front panel by the tabs on both sides and lift it until it stops with a click.

3. Loosen the screw and lift up the control box cover.

4. Pull the wires out of the control box, then release the pivots on both sides of the unit to remove the front panel completely.

Remove the air filters:

1. Lift the right air filter upwards slightly and then pull it out downwards.

2. Lift the left air filter upwards slightly and then pull it out downwards.

Remove the horizontal flap:

1. Release the center of the pivot and then release the side of the pivot.

2. Bend the horizontal blade slightly and remove it.

1. First, remove the lower trim panel by releasing the two fast-assembling lock catches and loosening the screw under the right lock catch. Then, grip the marked position to remove the panel.

2. Next, remove the base frame A by releasing two marked lock catches, removing the drainage pipe, and pulling wires out of the joint box.

3. Loosen the two marked screws on the fan motor cover and release it.

4. Loosen the single marked screw on the fan motor, then lift up the fan motor and remove it.

5. Lift up the fan and remove it.

1. Loosen the two marked screws on the casing.

2. Release the four marked hooks and then pull the grille out horizontally to remove it.

Note for assembling: Install the front grille horizontally to avoid stuffing the flap inside. Ensure the four hooks are caught properly.

Release stepping motor wires and the control box:

1. Remove the stepping motor and fan motor wires from the Appliance Control Board.

2. Pull the wires out of the control box.

3. Loosen the control box screw and then pull the box out.

Removal of Heat Exchanger:

1. Loosen the marked screw (1EA).

2. Pull the mounting plate and heat exchanger bracket, and then remove them.

3. Release the fixture plate from the base frame hook and remove it.

4. Loosen the four marked screws (4EA), which includes one screw on the right side, to release the heat exchanger.