Hi! I am new in the forum and this is my first post. Here a solution to this code.
F54 at power up.
SOLUTION: PROBABLE CAUSES:
1. Main fan motor (M11) failure. Replace M11 (p/n 25AA80540).
2. Open F2 on the main CB.
If 28V DC is not present at the main CB test point 2 (TP2), but is present at CN61-1 or CN61-2 from the
DC power supply, check each side of F2 to ground with power applied (located just to left of CN28).
If 28V DC cannot be measured on both sides of the fuse, replace the main CB. Check all 28V DC loads
for a bind or short to ground. Repair or replace the defective load as necessary.
F54 at power up.
SOLUTION: PROBABLE CAUSES:
1. Main fan motor (M11) failure. Replace M11 (p/n 25AA80540).
2. Open F2 on the main CB.
If 28V DC is not present at the main CB test point 2 (TP2), but is present at CN61-1 or CN61-2 from the
DC power supply, check each side of F2 to ground with power applied (located just to left of CN28).
If 28V DC cannot be measured on both sides of the fuse, replace the main CB. Check all 28V DC loads
for a bind or short to ground. Repair or replace the defective load as necessary.
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