Hayward H400FDN Universal H Series Troubleshooting Guide - Page 35

Verify ICB output, Test the FC4 fuse continuity, Verify ICB input, Verify transformer output

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Page 35 highlights

5. Service LED ON: 'BD' Code Test the FC4 fuse (continuity) Step 5A Verify ICB output Step 5B With power off, verify the FC4 fuse has continuity. IF fuse is good, go to 5B. IF fuse is blown, go to Section 4. Verify ICB input Step 5C Disconnect the P6 connector and test voltage for 110-125VAC between pins 3-5. IF no/low voltage, go to step 5D. IF correct, go to 5C. Verify transformer output Step 5D Disconnect the E10 connector from ICB. Verify 110125VAC between 1-3 (white & black). IF present, replace ICB. IF NOT, replace wire harness (pg. 20). 35 Disconnect P4 from fuse board. Verify 110-125VAC between 4-6 (grey wires). IF OK, replace fuse board. IF NOT, replace transformer (pg. 20).

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With power off, verify the FC4 fuse has continuity.
IF fuse is good, go to 5B. IF fuse is blown, go to
Section 4
.
Verify ICB output
Disconnect the P6 connector and test voltage for
110-125VAC between pins 3-5. IF no/low voltage,
go to step 5D. IF correct, go to 5C.
Test the FC4 fuse (continuity)
Step 5A
Disconnect the E10 connector from ICB. Verify 110-
125VAC between 1-3 (white & black). IF present,
replace ICB. IF NOT, replace wire harness (
pg. 20
).
Verify ICB input
Step 5C
35
Disconnect P4 from fuse board. Verify 110-125VAC
between 4-6 (grey wires). IF OK, replace fuse
board. IF NOT, replace transformer (
pg. 20
).
Verify transformer output
Step 5D
Step 5B
5. Service LED ON: ‘BD’ Code