Fault code 73 — Indoor EEPROM Data fault

What does 73 mean?

There is an error with the data stored in the indoor unit's EEPROM (Electrically Erasable Programmable Read-Only Memory). This can be caused by a faulty EEPROM, its control circuit, or incorrect installation.

• Indoor EE components fail
• The control circuit of the EE components fails
• The EE components has been inserted in opposite direction

Click steps to track your progress.

1. 1

   Ensure the EEPROM components are correctly oriented and installed.

2. 2

   If properly installed, replace the EEPROM components.

3. 3

   If the problem continues, the indoor control board may need to be replaced.