I have a Hayward H400IDL heater with an AO error. The blower is not running at all when heat is called for. Measured blower resistance between White-Red is 44 Ohm and White-Black is 80 Ohm. Disconnected the blower and measured voltages between Red-White and Black-White. Both are less than 2 VAC. Please tell me what's wrong and what to do next? Thank you. check safety circuit
SOURCE: Delonghi DCU72 refused to heat on 6th use.
I have the same problem.
Being an electrical engineer, I would like to debug the circuit card.
However, I would like to brew coffee also.
I disassembled the bottom of the coffee maker, and unscrewed
the bracket holding the circuit card.
I cut the input power and ground wires from the plug to the card, and detached its modular wire to the heating element.
I removed the card
(to take to lab for further debugging).
Then I bought some .25 inch modular tab connectors at the hardware store and attached one to the power wire formerly going to the circuit card. I attached this to the heating element.
I covered the spare ground wire with electric tape.
Now I have a coffee maker which brews coffee again (except that I must pull the plug to shut it off).
If I figure out what is wrong with the circuit card, I will update you.
SOURCE: 97 Jetta. headlights don't work
David,
Do you have a part number or location/description of the part you replaced? I have the same problem.
John
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.
SOURCE: Hayward Heater Problem ''AO'' error. H400IDH
Thank you for posting your question here on Fixya.com.
It sounds as if the air activated switch the tube you mention attaches to is not working. Pull the two wires from it and connect them to simulate the switch closing. Start up the heater to see if you get ignition. If so, replace the switch.
If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!
John
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.
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