Ac" Code - Hayward H150FDN Troubleshooting Manual

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 Verify blower operation
Step 13A Step 13B
Isolate the blower vacuum switch. Measure With the heater off (in "Stand By"), IF the blower
continuity between switch terminals. IF continuity continues to run/operate, replace the ICB. IF not,
exist, replace switch (pg. 20). IF OK, go to 13B. replace the blower vacuum switch (pg. 20).
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