Question about Hayward H-series Electronic Gas Pool Heater H400
UNIT INITIALLY FIRES THEN SHUTS OFF AFTER 15 SEC. FLASHES BOTH PO AND AO CODES. CODE LABEL IS TOO BADLY WEATHERED TO READ.
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Posted on Jan 02, 2017
This is a code for what is called a prover switch. What it is a circut for the air pressures. Depending on model you can have one or two of these. Their will always be one for the exaust perssure and this will often be the culpret. If the sensor is good a sooted exchanger, rat nests on the exchanger or in the exaust can cause this. If you have a second switch it will be for burner air pressure and you will look for the same problems only inside the burner cabnet. Good luck, I'm sorry I can't be more help. But at least you know to look to the vent system.
Posted on Dec 29, 2009
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."
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Posted on Apr 13, 2010
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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