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Variations in water temp. Older AO Smith unit

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My old and probably original AO Smith water heater (house was built 1997) seems to have developed a wide null

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Old 03-16-2013, 05:17 PM
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Smile Variations in water temp. Older AO Smith unit
Model Number: FSGT-50-224   Brand: -other-   Age: More than 10 years   

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My old and probably original AO Smith water heater (house was built 1997) seems to have developed a wide null or dead band between when it starts up the burner versus when it shuts off. In our morning showers we're having to set the shower dial to a much warmer setting for comfortable water temperature however once it recovers the water temperature is considerably warmer. (The water having been brought up to maximum or burner shut down threshold). We only notice the issue during the first tank of usage in the mornings. I looked on AO Smith's parts web site and cannot find ANY numbers that correspond to those on the label of this heater. I got a "Contact Customer Service for Parts" on Smiths web page. This is a totally manual water heater, no power vent, no electronic ignition etc. I was going to replace the gas/temperature control valve as it's a simplistic unit but given the tank being 15 years of age maybe it's a waste of $$. Worse is I cannot find the tank listed on the parts pages to find a control part number AND I cannot readily see how to get access to where the gas control valve enters the tank. (Possibly it has pipe threads and unscrews after draining the tank?) I'm not one to throw working stuff away and will willing repairing stuff if it's worthwhile. Give me some directions on removing the control valve from the tank body and what control assembly I should order to replace it. I will then make a determination based on its cost. Here are all the numbers from the label:
PN FSGT-50-J000N010000
SN MH95-0091066-224
Model FSGT 50-224
It would appear to have been manufactured sometime in 1991 but there is neither a month or day listed-just the number 1991.
FWIW, I'm comfortable working on gas equipment since I did Nat. gas conversions of old oil burner heating systems while going to college-some 50 plus years ago. Cheers.


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