Hayward H400FDN Universal H Series Troubleshooting Guide - Page 31

Open FC3 &/or F1 Fuse cont.

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3. Open FC3 &/or F1 Fuse (cont.) When testing the gas valve, if continuity appears between any wires and ground, then this implies a short has occurred and the gas valve will need to be replaced (refer to pg. 20 for part number). Verify gas valve is not shorted ICB wiring Step 3E Step 3F With power off, measure resistance, comparing each terminal to ground. IF any terminal shows continuity, replace the gas valve (pg. 20). IF OK, go to step 3F. Inspect ICB wiring. IF wiring is damaged, replace the wire harness with a new wire harness kit (pg. 20). IF OK and the problem still exists, replace the ICB (pg. 20) 31

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With power off, measure resistance, comparing
each terminal to ground. IF any terminal shows
continuity, replace the gas valve (
pg. 20
). IF OK, go
to step 3F.
ICB wiring
Inspect ICB wiring. IF wiring is damaged, replace
the wire harness with a new wire harness kit (
pg.
20
). IF OK and the problem still exists, replace the
ICB (
pg. 20
)
Verify gas valve is not shorted
Step 3E
31
Step 3F
3. Open FC3 &/or F1 Fuse (cont.)
When testing the gas valve, if continuity appears between any wires and ground, then
this implies a short has occurred and the gas valve will need to be replaced (refer to
pg. 20 for part number).