These codes indicate that the fan speed of the device is outside the normal range. This can happen if the speed is too low or too high for an extended period, causing the air conditioner to stop and display the corresponding error code.
- EH03 relates to issues with the indoor unit’s fan.
- EC07 concerns the fan of the outdoor unit.
Common Brands Using These Codes
Some brands that use these codes include: Samsung, Midea, Bosch, Olimpo, Caly, Simply, BGH, Voltas, Bluestar, Godrej, Lloyd, Reconnect, Prestige, Mirage, Actron, among others.
General Recommendations
Below, we explain how to solve these issues based on the type of fan in your air conditioning system. We will focus on ASF fans, which have two sets of connections: three thin wires and three thick wires.
- Manual Fan Check
Turn off the device and manually spin the turbine to ensure that the rotation is smooth, with no obstructions or unusual noises. - Startup and Initial Test
Turn on the device and check if the fan starts. If it doesn’t, try spinning it quickly by hand. If the fan works after this, it is likely that the capacitor is faulty and needs replacement. - Visual Inspection
If the previous step is inconclusive, visually inspect the connections between the electronic board and the fan capacitor. - Capacitor Precautions
Remember that a capacitor stores energy. Handling it without discharging it first can be dangerous. Discharge the capacitor using a resistor or an insulated screwdriver before proceeding. - Capacitor Test
Use a multimeter set to the microfarads scale to measure the capacitor’s capacity. The reading should match the specifications indicated on the capacitor. - Motor Check
If the capacitor is in good condition, measure the resistance between the pairs of thick wires on the motor. No measurement should be zero or infinite; if it is, the motor must be replaced. - Fan Speed Sensor Test
Disconnect the fan wires from the electronic board and measure the voltage between the sensor wires (thin wires). If no voltage variation is detected when manually rotating the fan, the sensor is faulty. - Electronic Board Inspection
If the correct sensor voltage (5V or 12V) is not detected, the issue may lie with the electronic board.
Types of Motors and Fans
- Motors with Capacitor and Triac (AC)
These motors work with a triac and an optocoupler. The most common failures involve the capacitor, triac, bearings, or Hall effect sensor. - Brushless Motors (BLDC)
These motors are popular in modern systems due to their efficiency. Common failures include issues with the IPM module or motor windings. To diagnose, measure the resistance between the motor pins and check the IPM module’s condition using a multimeter in diode mode.
