Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1

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Error code A0

How do i fix the A0 error code, blower vacuum switch open? Where is the blower vacuum switch?

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Just left of center inside the top of the front cabnit.(where the hayward label is) It's about 2 1/2" around and has two small hoses coming from it.

Posted on Jul 14, 2010

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Dear ,

Please try the below solutions,

Solution 1:
If the blower prover switch does not close after the blower starts the control will stop the ignition trial go into lockout. The blower will continue to run. Automatic reset is immediate after the switch closes
Solution 2:
If the blower prover switch opens unexpectedly during operation the control will shut down and attempt to re-light. If the switch does not close after the blower starts the control will go into lockout with the blower running. Automatic reset is immediate after error is corrected
Solution 3:
If the blower prover switch opens during the postpurge cycle (heater is not fir- ing) the control will display the error code. The post-purge cycle will be com- pleted once the blower prover switch close
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You didn't indicate exatctly which model you have. But on most the AO error code is :Blower vacuum switch
open error If the blower prover switch does not close after the blower starts the control will
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