E1 n 53 (FJM Indoor) — Float switch secondary detection

What does E1 n 53 mean?

The FJM indoor unit displays E1 n 53, indicating that the float switch has detected a secondary (higher) level of water, signaling a potential condensate drainage problem. This can lead to water overflow.

• Clogged condensate drain line preventing water drainage
• Faulty float switch
• Condensate pump malfunction (if applicable)

Click steps to track your progress.

1. 1

   Turn off the FJM indoor unit at the circuit breaker to prevent water damage.

2. 2

   Check the condensate drain pan for excess water and inspect the drain line for any blockages. Clear any obstructions.

3. 3

   Inspect the float switch (and condensate pump if present) for any visible damage or sticking.

4. 4

   Restore power. If the problem persists after clearing the drain, contact a qualified technician.