What does 24 mean?

A fuse related to the secondary voltage circuit has blown. This indicates a potential electrical issue within that circuit.

• Blown fuse
• Short circuit in secondary voltage wiring
• Component failure drawing excessive current

Click steps to track your progress.

1. 1

   Locate and check the secondary voltage fuse on the control board.

2. 2

   Replace the fuse if blown, using the same amperage rating.

3. 3

   If the fuse blows again immediately, there is a short circuit.

4. 4

   Contact an HVAC technician to diagnose the short circuit.