Tempstar Indoor Unit EEPROM / Configuration Error

Tempstar ductless mini-split indoor unit shows F9 and does not cool properly

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Corrupted indoor control board memory, Incorrect replacement board, Power surge damage, Failed EEPROM chip

Safety first: Turn OFF power to the indoor unit.

Steps:

1. Power reset: Leave power off for 10 minutes, then restore and test.
2. Check board part number: If the board was recently replaced, verify it is the correct Tempstar part for your model.
3. If F9 persists: The control board will likely need replacement and configuration by a technician.

Hard 4/5

Indoor Control Board

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