Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1 Logo
Posted on Jul 14, 2010
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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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  • Master 990 Answers
  • Posted on Jul 14, 2010
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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.

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