Hayward H400FDN Universal H Series Troubleshooting Guide - Page 57

AC Code stands for Air Switch Closed.

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13. Service LED ON: "AC" Code "AC" Code stands for "Air Switch Closed". The blower vacuum switch closed, when it was expected to be open. Test blower vacuum switch Step 13A Verify blower operation Step 13B Isolate the blower vacuum switch. Measure continuity between switch terminals. IF continuity exist, replace switch (pg. 20). IF OK, go to 13B. With the heater off (in "Stand By"), IF the blower continues to run/operate, replace the ICB. IF not, replace the blower vacuum switch (pg. 20). 57

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Isolate the blower vacuum switch. Measure
continuity between switch terminals. IF continuity
exist, replace switch (
pg. 20
). IF OK, go to 13B.
Verify blower operation
Test blower vacuum switch
Step 13A
57
Step 13B
“AC” Code stands for “Air Switch Closed”. The
blower vacuum switch closed, when it
was expected to be open.
With the heater off (in “Stand By”), IF the blower
continues to run/operate, replace the ICB. IF not,
replace the blower vacuum switch (
pg. 20
).
13. Service LED ON: “AC” Code