Error code E6 can be grouped for different air conditioning manufacturers into several groups based on their similar meanings:
Group 1 – Ambient Temperature Sensor or Evaporator Issues In this group, we can group the following air conditioning brands:
- General Electric
- Midea Air Conditioning
- SAMSUNG
- York Central Air Conditioning
- FUJITSU
- PANASONIC
Now, let’s begin with some basic definitions.
What is the Temperature Sensor? The temperature sensor is a device that measures the room air temperature in the case of the ambient sensor and the evaporator temperature in the case of the freeze sensor. It is located in the indoor unit of the air conditioner.
The temperature sensor is an electrical resistance that receives electrical current from the control card or board. The electrical resistance of the sensor changes when the temperature changes, causing a voltage change in the electrical current supplied by the electronic card. This voltage change is detected by the card or electronic board. The sensor sends this signal to the card or electronic board. The card or electronic board uses this information to adjust the cooling or heating power.
In very rare cases, the error may be caused by a damaged electronic board. The electronic board controls the operation of the air conditioner. If the board is damaged, it can cause problems with the interior ambient temperature sensor.
Group 2 – Communication Problems between Indoor and Outdoor Units In this group, we can group the following air conditioning brands:
- BOSH
- DAEWOO
- TRANE
- GREE
- ELECTROLUX
- SHARP
- KELVINATOR
The failure of communication between the evaporator and condenser is the most common error in mini-split inverter systems. Follow these steps:
- Verify that the control card of the external unit or condenser is indeed receiving voltage. If the installation is in good condition, the voltage should not fluctuate, and if it does, it should not exceed 3% of the nominal voltage. In other words, if the equipment is rated at 220V, the voltage at the terminals of the external unit or condenser should not drop by more than 5 volts. If this is not the case, there are electrical installation problems that need to be checked.
- If the power at the terminals is within normal values, the next step is to check if the control board of the condenser is turning on. Many external boards come with indicator LEDs; you can check if any of them are lighting up. This allows us to infer that at least voltage is reaching the board. If you don’t see any indicator lights on or blinking, it’s likely that the error is due to a fault in the external board. However, we must make sure that the control board does have indicator lights or that these are at least visible without disassembling the board.
- If, indeed, you manage to see the indicator lights, you would need to check the condition of the connection terminals of the external unit. If there is any rusty screw or sulfated terminal, you should replace it immediately and test if this resolves the issue.
- If the issue persists, you should install a temporary communication cable, only on the signal line, as they call it, which is one of the three wires that the wiring connecting the internal and external units carries. This can be a single-strand telephone wire without splices. If, during testing, you find that the equipment starts operating normally, it means you have a problem with the wiring, and you should replace it entirely, making sure it has no splices.
- If this does not resolve the issue, you would be facing a problem with one of the control boards, either the internal or the external one. In some cases, both can have faults. The communication error may also appear after the equipment has been operating normally for a few hours or even days. In any case, you should follow the previous steps.
Group 3 – Compressor Startup Problem This error code meaning is associated with the DAIKIN brand. Depending on the type of compressor, check in conventional models, the working capacitor of the compressor.
Group 4 – Pressure Value Problems This error code meaning is associated with the HAIER brand. Check for maintenance or cleaning of the condenser and evaporator to rule out overpressure or low values due to poor thermal exchange in these parts.