E7 - 2 red flashes, 2 green flashes — Comms fault between indoor and outdoor unit

What does E7 mean?

This error signifies a communication fault between the indoor and outdoor units. It may be related to a condensate pump or issues with the 12/24Vdc power supply.

• Condensate pump connected to indoor unit
• Power supply issue to the outdoor unit
• Faulty indoor unit board

Click steps to track your progress.

1. 1

   Check for a condensate pump connected to the indoor unit.

2. 2

   Reset power to the outdoor unit.

3. 3

   Verify the 12/24Vdc supply on terminals S2 and S3.

4. 4

   Consult a technician if the problem continues.