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Old 06-16-2012, 08:07 AM   #16
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AO Smith GPSH water heater in System Lockout mode


Thanks so much for the info. This worked perfectly. My wife is very happy that we had to spare a Saturday service call to tech. Saved $$$!!!

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Old 06-26-2012, 08:25 PM   #17
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AO Smith GPSH water heater in System Lockout mode


I will try you fix tomorrow my water heater did the same 4 years ago but fix it by him self. so this time I will try your fix thanks for posting this.
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Originally Posted by Abs777 View Post
I found out what it was. It was a dirty Flame sensor. I guess it was thinking that there wasn't a flame \wasn't getting gas and kicking itself off. I unplugged the water heater, pulled the bottom plate off (1 screw, undid the gas line (turn off the gas first), and pulled out the burner assembly. I then took sand paper and cleaned the flame sensor, put everything back together and boom HOT WATER. It was less than 20 minutes and saved me at least $100. The flame sensor looks like this (on the right) if anyone finds this thread in the future.



Thanks for the help.
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Old 08-23-2012, 10:18 PM   #18
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AO Smith GPSH water heater in System Lockout mode


Water heater had the same problem. System lockout.

cleaned the sensor and vaccummed the unit for the dust.

Worked like a charm. Big Thanks Again

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Old 12-21-2012, 12:43 PM   #19
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AO Smith GPSH water heater in System Lockout mode


Just in time for Christmas...My A.O. Smith Pro Max High Recovery 50 gallon tank, built in March 2008, is not heating water. The pilot is not out. It seems to kick on and off. Water is a balmy (ha) 80 degrees at faucets. My heating contractor has been here and is ordering a gas limiter valve. It won't arrive until the 26th; five days. Would the above instructions work? The plastic dust covers at the bottom of the heater were not very dirty. I haven't pulled any other covers off. My three teenagers are getting ripe. Anyone?
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Old 01-24-2014, 08:16 PM   #20
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AO Smith GPSH water heater in System Lockout mode


Hope you're still active on this site and just wanted to say thanks. Just finished completing your cleaning steps and "Bam!" Hot water with no successive start-ups and shut-downs. If you were in WI I'd so buy you a drink. Thanks again.
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Old 01-29-2014, 10:41 AM   #21
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AO Smith GPSH water heater in System Lockout mode


Glad it was of help...and Thank you!
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Old 05-04-2014, 09:04 PM   #22
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AO Smith GPSH water heater in System Lockout mode


This worked like a charm! We've been fighting with having to reset the water heater for a week until today when it just wouldn't reset. Husband was online looking up new hot water heaters when I found your thread. I had him try it....it's working great. Except now he's mad he can't buy a tankless Thanks for saving us some $$$

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