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

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H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1: how do i fix the AO code on my hayward heater?...

How do i fix the ao code on my hayward heater?

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AO will apply to your blower, blower tubing, or blower vacuum switch. You need to check these items.

Posted on May 20, 2010

  • Anonymous May 25, 2010

    sorry, but checking those items wil likely solve your problem. if not post back here and i can help you.

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I recommendyou call the Hayward technical support at 908-355-7995and they might be able to help you figure this issue out. Ihope this helps.

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AO error


This error is produced when the blower prover switch does not close after the blower starts, the control will stop the ignition and go into lockout. Automatic reset is immediate after the blower prover switch closes.

If you keep having this problem, contact a reputable service company, especially if it's under warranty.

The link to the owners manual is below, it references fault codes, etc..

Hope this helps.

http://74.125.95.132/search?q=cache:4mAdY7bLfoQJ:www.haywardnet.com/products/Manuals/pdfs/Manual227.pdf+hayward+AO+error&cd=7&hl=en&ct=clnk&gl=us

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Error code AO defined as blower vaccum open


I just had same code. I took off top cover and found the end of the hose attached to the blower was split and not attached securely. Attaching hose solved the problem for me and heater fired up.

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