Code 28-72 Fuse 2 Open Lockout - Fuse 2 on PCM board is blown or missing.

What does 28-72 mean?

This code is set if Fuse 2 on the PCM board is blown or missing. Fuse 2 specifically powers the LLS (Liquid Line Solenoid). When this fault is active, the entire system will not operate.

• Blown or missing Fuse 2 on the PCM board.
• Short circuit in the LLS (Liquid Line Solenoid) wiring.

Click steps to track your progress.

1. 1

   Visually inspect Fuse 2 on the PCM board for a broken filament or if it is missing.

2. 2

   Check the LLS wiring for any signs of damage or short circuits.

3. 3

   Replace Fuse 2 with a new, undamaged fuse of the correct size and type, as specified in the wiring diagram.

4. 4

   If the new fuse blows, carefully re-inspect the LLS wiring and connections for persistent shorts, then seek professional help.