Hayward H400FDN Universal H Series Troubleshooting Guide - Page 60
Service LED ON: AO Code cont.
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14. Service LED ON: "AO" Code (cont.) Step 14D Measure blower resistance Before Sept. 2010 With power off, disconnect blower plug from ICB. Models manufactured before Sept. 2010: measure across pins 1-2 (black & red), then 3-4 (white & blue) for 8-9 ohms. Models after Sept. 2010: measure for 4-5 ohms across the two terminal with wires. IF out-of-range, replace blower (pg. 20). IF correct, go to step 14E. Blower plug on ICB Step 14E On the ICB (while calling for heat). Verify 110-125VAC across 60 Pins 1 & 2 of Inducer on ICB. IF OK, replace blower vacuum switch (pg. 20). IF NOT present, replace ICB (pg. 20)
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14. Service LED ON: “AO” Code (cont.)
With power off, disconnect blower plug from ICB. Models manufactured before Sept. 2010:
measure across pins 1-2 (black & red), then 3-4 (white & blue) for 8-9 ohms. Models after Sept.
2010: measure for 4-5 ohms across the two terminal with wires. IF out-of-range, replace
blower (
pg. 20
). IF correct, go to step 14E.
Measure blower resistance
Before Sept. 2010
Step 14D
On the ICB (while calling for heat). Verify 110-125VAC across
Pins 1 & 2 of Inducer on ICB. IF OK, replace blower vacuum
switch (
pg. 20
). IF NOT present, replace ICB (
pg. 20
)
Blower plug on ICB
Step 14E