Hayward H400FDN Universal H Series Troubleshooting Guide - Page 25

Inspect wiring, Test P5 low voltage, Test ICB input low voltage

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Page 25 highlights

1. Heater Not Powering Up (cont.) Test P5 (low voltage) Step 1I NOTE: Step 1I - Heaters older than 11/2010 - If no voltage across R & C, remove FC3 fuse and test for continuity. IF open go to page 24. IF OK go to Step 1J Disconnect the plug from P5 (on fuse board). Test 22-28VAC between R & C. IF no voltage, replace Fuse Board (pg. 20). If correct, go to step 1J. Inspect wiring Step 1J Test ICB input (low voltage) Step 1K Inspect ICB wiring, ensuring all plugs are securely fastened. IF wiring is OK go to Step 1K. IF NOT, secure wiring/plugs then retest. 25 Disconnect and test the red and grey wires from the ICB. IF 22-28VAC is present go to step 1L. IF NOT, replace wire harness (pg. 20).

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NOTE: Step 1I
–
Heaters older
than 11/2010
–
If no voltage
across R & C, remove
FC3 fuse and test for
continuity. IF open go to page
24. IF OK go to Step 1J
Disconnect the plug from P5 (on fuse board). Test
22-28VAC between R & C. IF no voltage, replace
Fuse Board (
pg. 20
). If correct, go to step 1J.
Inspect wiring
Inspect ICB wiring, ensuring all plugs are securely
fastened. IF wiring is OK go to Step 1K. IF NOT,
secure wiring/plugs then retest.
Test P5 (low voltage)
Step 1I
25
Step 1J
1. Heater Not Powering Up (cont.)
Disconnect and test the red and grey wires from
the ICB.
IF 22-28VAC is present go to step 1L. IF
NOT, replace wire harness (
pg. 20
).
Test ICB input (low voltage)
Step 1K