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

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Can you run the pool heater with the AO code flashing

The AO code is flashing on my pool heater. Should I turn it off or let it keep running? I don't have a manual for the heater.

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It will not run with AO code. That is telling you something is wrong/blocking the combustion fan from satisfying the safety switch. If it is a brand new heater this usually means the correct voltage has not been set in the heater = you would need to check what you have and then check setting. Doing this incorrectly could completely destroy all electronics in the heater.
If this is a heater startup for a new season the rubber tube from the combustion fan to the blower switch could be off or damage by rodent bites.
If this heater is older it could be a clogged heat exchanger which is a much bigger repair or problem for a homeowner.
manuals are available on haywardpool.com

Posted on Apr 26, 2014

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Posted on Jan 02, 2017

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  • 366 Answers

SOURCE: 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

Posted on Sep 16, 2009

john224
  • 1378 Answers

SOURCE: blower runs but no ignition then AO error code

Your problem then would be the pick up tubing and/or switch attached to the blower that closes once the blower is on to allow the heater to ignite. Pull the tubing and check it for dust or other debris clogging it and check inside the blower housing for the same. If you can test the switch under operation, you should see it remains open during start up which is why the burners won’t fire. If you do not find any obstruction (if you can, blow some compressed air thru too just to be sure) then you will need to replace the switch.

Posted on Jan 04, 2010

  • 4 Answers

SOURCE: I had code AO displayed on my hayward H250IDE. I

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

Posted on Mar 01, 2010

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

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

Posted on May 20, 2010

  • 7 Answers

SOURCE: Pool Heater will not light. (Flashes AO)

Mine had this problem, removed the blower and manually rotated the shaft. It was stuck, but once freed it runs fine.

Posted on Jun 11, 2011

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Error AO ON MY HAYWORD H SERIES POOL HEATER


The AO mindicates an open prover switch ,, here from Hawward site .
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.

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stop the ignition trial go into lockout. The blower will continue to run. Automatic
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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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Pool Heater will not light. (Flashes AO)


If you hear the blower come on, then you have an air sensor problem. Hopefully the air hose popped off, or has cracked...If not then you will probably neet to replace the air pressure switch.

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