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Craig, Electrical Technician
Category: Appliance
Satisfied Customers: 4529
Experience:  33 years experience electrical troubleshooting industrial equipment and control systems.
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I have a AO Smith 75 gal gas water heater. It only operates

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I have a AO Smith 75 gal gas water heater. It only operates for 1 heating cycle. After hot water is used it should reheat water, however all that happens is it stops working - temp control unit lights all go on and I have to power cycle to reset. what can this be?

Craig :

Check the wire harness, it's loose and it may just need reseating. Unplug and re plug it

Craig :

If that does not fix it, I would replace the thermostat/controller. Here are the part numbers and diagram.


Craig,Sounds reasonable, I will try it

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