H99 — Indoor operating unit freeze protection (Cooling)

What does H99 mean?

The unit has entered indoor freeze protection mode during cooling. This can be caused by issues with the indoor heat exchanger, a dirty air filter, or a short circuit in air circulation.

• Indoor heat exchanger issue
• Dirty air filter
• Air circulation short circuit

Click steps to track your progress.

1. 1

   Check the indoor heat exchanger.

2. 2

   Clean or replace the air filter.

3. 3

   Ensure there are no obstructions to air circulation.