Burnt varistor (NR11) and blown fuse (F11) — Indoor power board fault

What does Varistor (NR11) burnt and Fuse (F11) blown mean?

Both the varistor and the fuse on the indoor power P.C. board have failed. This suggests a significant electrical issue within the indoor unit's power supply.

• Power surge
• Short circuit on the indoor power board
• Component failure leading to fuse blowing

Click steps to track your progress.

1. 1

   Turn off the power supply before inspecting or replacing parts.

2. 2

   Replace both the varistor (NR11) and the fuse (F11).

3. 3

   Visually inspect the indoor power P.C. board for any other signs of damage.

4. 4

   After replacement, monitor the unit for recurrence of the issue.