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

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I had code AO displayed on my hayward H250IDE. I

I had code AO displayed on my hayward H250IDE. I found the blower motor frozen and burnt. After replacing it I still have the AO code. The blower fan starts running as soon as I turn on the power and after a few seconds the AO code is displayed. The hoses are not pluged and the blower switch on the right checks good. Any help would be great. Also the blower never turns off. I am guessing thats why in burned up.

Posted by Anonymous on

  • Anonymous Mar 02, 2010

    I did some further troubleshooting and found all the safety switches good. The JQ1aP-B-24v relay on the board at position K1 was testing closed with power off. The contacts were welded together. The new relay is on the way. I beleve the AO code was displayed because the switches were closed before the unit thought they should be, due the stuck relay. Thanks for the help.

  • Anonymous Mar 05, 2010

    I soldered in the new relay on the board and all is well. A new board or $4.00 relay. I think I got lucky.

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Check your wiring again on all the safety devices - Water pressure switch and both Hi- limits in the header.

Posted on Mar 01, 2010

Testimonial: "Thank you very much for the assit. I did find a kink in the vent safety switch. Thanks again."

  • Anonymous Mar 01, 2010

    Also check the wiring and vaccum hose connecting the air switch. Should be a gray rubber hose connected to the blower and a round plastic air switch.

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1 Answer

Hayward h400 pool heater blower not starting


it could be a bad blower vac switch, and you may look at the rubber tubing going into the switch to ensure it hasnt dry rotted.

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1 Answer

Ao appears after ignigtion


Either the fan is not working, or the fan prover (pressure switch) switch is stuck. If you can hear the fan going strong, it is most likely the switch. You may try to just clean it out, but you may need a replacement.


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

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Ao error message in Hayward heaters


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
stop the ignition trial go into lockout. The blower will continue to run. Automatic reset is immediate after the switch closes.Check to be sure combustion blower starts
If you don't have your manual you can download one for your exact model at : www.haywardnet.com

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1 Answer

I have an ao code and have replaced the vaccum switch and blower vaccum switch and still getting the ao code


Check the tubing going from the blower to the blower vacuum switch. If there are any cracks, missing, or cut, it will give the same code. Rodents like to chew on this tube. Also, if the blower is not coming on at all, then you will get the same code, and the problem is not with the switch, it is likely in the blower.

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