Error E8 / Indoor Red LED Flashes Once — Indoor unit sensor, drain, or float switch fault

What does E8 / Indoor Red LED 1 flash mean?

Error E8, indicated by one flash of the indoor unit's red LED, can point to several issues: a closed circuit in the indoor heat exchanger sensor (ThIR), a fault with the drain motor (DM), condensate remaining in the drain tray due to blockage, or a float switch stuck in a high position.

• Indoor unit heat exchanger sensor (ThIR) failure (closed circuit)
• Drain motor (DM) failure (open circuit or disconnected)
• Condensate still detected in drain tray (blockage in discharge pipe or condensate returning)
• Float switch stuck in high position

Click steps to track your progress.

1. 1

   Turn off the main power to the unit.

2. 2

   Check the drain pipe for any blockages and clear if necessary.

3. 3

   Inspect the drain motor connection to the indoor PCB to ensure it is secure.

4. 4

   If accessible, check the float switch for any debris or obstructions preventing its movement.

5. 5

   If the problem continues, a professional should inspect the sensors and drain system.