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Eratic function I have An AO Smith Model FPSH 40-260 Nat gas water heater. when I turn it on it heats water up the first time. then when it calls for heat again, fan comes on - glo plug starts -gas does not come on - glo plug shuts down - fan shuts down. and it keeps repeating this cycle until I turn the switch off. after a couple days I can repeat this and it will do the same thing. Is this maybe the control valve? Doug

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It is the control valve - however not in the sense that IT is bad - the thermocouple on your unit is bad.

The purpose of the thermocouple is to convert the heat from the pilot to a miniscule amount of energy that the control valve senses letting it know the pilot is present... a default safety so gas does not fill the house!

With no pilot (which you have) or no SIGNAL to the control valve, it will not open to allow the burners fuel for ignition.

Sometimes the thermocouple is out of position (should be at the tip of the pilot light)...

Sometimes it is covered in soot, and can be cleaned with a fine sandpaper...

Sometimes it needs to be replaced altogether.

Most thermocouples are generic, but some are a specific value. Check with your manufacturer for a part #.

Thanks for using FixYa - a FixYa rating is appreciated!!

Posted on Feb 09, 2009

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No hot water - the light shows red. It has had problem in the past months but cutting the power off and back on seemed to reboot the computer. This time the light stays red.


Before calling service technician:
Click following link, the click product, then scroll to page bottom to tab that offers technical literature, and download service manual and operation manual.
http://www.hotwater.com/water-heaters/residential/hybrid/

Read the required installation and maintenance protocol to see if air filter has been cleaned regularly, or the condenser coil might be dirty.
Required maintenance can be done by service tech recommended by AO Smith.
Contact AO Smith to find trained person, and next time, do not install expensive water heater since all savings disappear with service issues.

Gene
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Copy following link for troubleshoot service manuals by type of gas control valve, including instructions for replacing gas control valve:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://www.hotwater.com/lit/training/320988-000.pdf
Perform the required maintenance, and catch unit up to date, and replace gas control,,, might be best to call plumber.
The intellivent gas control valve is removed completely from tank, so tank must be drained.

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AO Smith BTH 500 ignitor keeps burning out,is my electronic control the problem?


I would report problem to AO Smith.
Also ask question on pro water heater forum
http://www.thetankatwaterheaterrescue.com/forums/forum3/

AO Smith service handbooks:
http://www.hotwater.com/resources/product-literature/service-handbooks/
If the igniter is not turning off, then that would explain early failure, and it would be caused by the control chipset

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Try removing the igniter. (First turn the heater off) There is a heat sensor rod on the igniter. If it is blackened use fine sand paper or a scotch brite pad and clean it so it is shiney. reinstall the igniter (turn the heater back on) and try it. If that doesn't work the igniter may be defective and will require replacement. I have a smaller A.O. Smith water heater and that little trick has saved me three service calls. Good luck.

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AO Smith Water heater FPSH50-260 keeps blowing fuses


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1) The blower is plugged into 120Volt outlet. If blower has short, then it will trip breaker.
Blower could be Fasco model 7021-10195, or 7021-10770. Call AO Smith: 1-800-527-1953. They will need model number and serial number located on label on side of tank.

2) Before calling AO Smith, check outlet with circuit analyzer. Outlet must have correct polarity and must be grounded. Unplug cord to water heater and run continuity test from ground prong on electrical plug to manifold tube on gas valve.

3) Also if a fluorescent light fixture is on the same breaker, that can cause burner to short cycle.

4) Connect water heater to different outlet and see if problem continues.

5) AO SmIth has service manuals for the FPSH series that download to your computer:
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I have an A. O. Smith Model FPSH 40-261 hot water heater. It won't heat water. there is a green light on the control flashing. What does it mean?


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Some models use White Rodgers Intellivent with a row of indicator lights.

The gas control blinks the error code:
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http://waterheatertimer.org/pdf/Honeywell-Gas-Valve-LED-Codes-2000.pdf
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I have a Reliance water heater - 40 gal Model


In my first 15 years as a plumber I never saw a pilot light issue on a gas WH that a new thermocouple didn't fix. Since the government mandated a redesign of the fire box, I've seen three that nothing ever fixed - two Whirlpools and one (my usually ultrareliable) AO Smith - including replacing the entire burner assembly and the regulator. And I've heard of many others.

Check the thermocouple connection for tight. (Don't strip.. threaded soft metals.)
Check the microvents on the bottom ? of the burn box for dust, even if it is new.
Call Reliant and demand new units until you get one that works.
Try another model. Consider a 52gal electric.

I've always recommended gas over electric, and AO Smith and Rheem were my recommendations (and "Reliants" were "lumber yard" water heaters. Sorry.)

Since the mandated redesigns, I don't really have a "proven reliable" model to suggest. I increasingly believe the restricted air flow design is the ultimate culprit, including any changes to the thermocouple/regulator construct to accommodate the restricted air flow design. Just my hunch.

Offered for what its worth. -- plumber in Indiana.

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