Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1
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.
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
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.
Posted on Sep 16, 2009
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
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."
AO will apply to your blower, blower tubing, or blower vacuum switch. You need to check these items.
Posted on May 20, 2010
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