Hayward H400FDN Universal H Series Troubleshooting Guide - Page 39

Inspect ignitor wires, Ohm out ignitor

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7. Service LED ON: "IO" OR "SB" Code Check display for "IO" Step 7A Inspect ignitor wires Step 7B "IO" error stand for ignitor Open. IF this error appears, go to step 7B. IF "IO" does not appear, go to step 7D. Ohm out ignitor Step 7C Power down and inspect ignitor wiring, ensuring ignitor plug is securely attached to the ICB. IF OK, go to step 7C. IF not, secure plug. Check display for "SB" Step 7D With power off, verify ignitor ohm resistance ( 8-25 ohms between 20°- 140°F). IF correct, replace ICB. IF out-of-range, replace ignitor (pg. 20). 39 "Stuck Button" indicates display board is acting as if the button is being pressed and held. Replace display/bezel/key pad (pg. 20). Go to pg. 66 to test.

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“IO” error stand for
ignitor Open. IF this error
appears,
go to step 7B. IF “IO” does not
appear, go
to step 7D.
Inspect ignitor wires
Power down and inspect ignitor wiring, ensuring
ignitor plug is securely attached to the ICB. IF OK,
go to step 7C. IF not, secure plug.
Check display for “IO”
Step 7A
With power off, verify ignitor ohm resistance ( 8-25
ohms between 20°-
140°F). IF correct, replace ICB.
IF out-of-range, replace ignitor (
pg. 20
).
Ohm out ignitor
Step 7C
39
“Stuck Button”
indicates display board is acting as
if the button is being pressed and held. Replace
display/bezel/key pad (
pg. 20
).
Go to pg. 66 to test
.
Check display for “SB”
Step 7D
Step 7B
7. Service LED ON: “IO” OR “SB” Code