A030_F: Open Fuse
Status
This is a critical fault. The furnace will not operate in any mode.
Description
The fuse has been opened. This usually occurs when there is a 24VAC short to common or ground on the low voltage side of the transformer.
Expected Operation
The fault code is displayed and no other operation can take place.
Cause
An electrical short from low voltage (24VAC) to ground or common has occurred.
Solution
Repair the short circuit condition and replace fuse.
