AO Smith Gas Hot Water Heater Keeps Turning Off

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AO Smith Gas Hot Water Heater Keeps Turning Off

Author: cconway25 (PA)

Hi there, I've got an issue where my 75 gallon gas hot water heater (AO Smith) will ignite, wait about 5 seconds, and then turn off. It does this about 3 times and then shuts off with an error code. A few hours later, it will repeat this cycle indefinitely.

If I take the plate off in front of the burners and blow a fan in there while it tries to fire up, voila! it stays lit and is fine.

My heater is in my basement which is open and presumably well ventilated.

Does anyone know what the issue is and what I can do about it?

Thanks!

Edited 1 times.

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Re: AO Smith Gas Hot Water Heater Keeps Turning Off
Author: JLNY (NY) What is the error code
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Re: AO Smith Gas Hot Water Heater Keeps Turning Off
Author: cconway25 (PA) Indicators A and B are lit up.
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Re: AO Smith Gas Hot Water Heater Keeps Turning Off
Author: m & m (MD) Most likely a venting issue, vacuum issue, etc.
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Re: AO Smith Gas Hot Water Heater Keeps Turning Off
Author: packy (MA) yeah.. most gas safety devices are designed to not let it fire up. a blocked vent safety will shut it down. when you open the door below it must give the safety the impression that it is drafting..
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Re: AO Smith Gas Hot Water Heater Keeps Turning Off
Author: steve (CA) What model is it? Here's a snip for one model -
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