Error 198 — Disconnected thermal fuse of indoor unit

What does 198 mean?

The thermal fuse in the indoor unit has disconnected, acting as a safety measure to prevent damage from overheating. This usually indicates an underlying issue causing excessive heat.

• Overheating of indoor unit components (e.g., fan motor, heating element)
• Faulty thermal fuse itself
• Electrical overload or short circuit
• Blocked airflow around indoor unit

Click steps to track your progress.

1. 1

   Immediately turn off the indoor unit and its associated circuit breaker.

2. 2

   Check for any obvious signs of overheating or blockages around the indoor unit that might have caused the fuse to trip.

3. 3

   Allow the unit to cool down completely for at least 30 minutes.

4. 4

   If the fuse is a resettable type, follow the manual's instructions to reset it. If not, it indicates a significant internal problem.

5. 5

   This issue often requires a qualified technician to diagnose the root cause of the overheating and replace the fuse.