Hayward H400FDN Universal H Series Troubleshooting Guide - Page 24

Test Fuses, Inspect connections, Test transformer input, Test transformer output

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1. Heater Not Powering Up (cont.) Inspect connections Step 1E Test Fuses Step 1F Inspect Fuse Board wiring, ensuring all plugs are securely fastened. IF correct, proceed to step 1F. Test transformer input Step 1G Verify that FC1 & FC2 fuses aren't open. Replace all open fuses & go to section 2. IF correct, go to 1G. Test transformer output Step 1H Disconnect the P3 plug from the fuse board. Test 110-125VAC between pins 1&2 and 3&4 on the board. IF good, go to 1H. IF NOT, replace the Fuse 24 board (pg. 20). Disconnect P4 plug from fuse board. Verify 2228VAC between pins 1 & 2 (red wires), then 110125VAC between pins 4-6 (grey wires). IF correct, go to 1I. IF incorrect replace transformer (pg.20).

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Inspect Fuse Board wiring, ensuring all plugs are
securely fastened. IF correct, proceed to step 1F.
Test Fuses
Verify that FC1 & FC2 fuses aren’t open. Replace all
open fuses & go to
section 2
. IF correct, go to 1G.
Inspect connections
Step 1E
Step 1F
Disconnect the P3 plug from the fuse board. Test
110-125VAC between pins 1&2 and 3&4 on the
board. IF good, go to 1H. IF NOT, replace the Fuse
board (
pg. 20
).
Test transformer input
Step 1G
24
Disconnect P4 plug from fuse board. Verify 22-
28VAC between pins 1 & 2 (red wires), then 110-
125VAC between pins 4-6 (grey wires). IF correct,
go to 1I. IF incorrect replace transformer (
pg.20
).
Test transformer output
Step 1H
1. Heater Not Powering Up (cont.)