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Posted on Jan 02, 2017
AO smith manuals
GPVH series manual
You can search the manual for FV
The FV sensor shorted because it detected flammable gas
Flammable liquids (such as
gasoline, solvents, propane (LP or butane, etc.) and other substances
(such as adhesives, etc.) emit flammable vapors which can be ignited
by a gas water heater's hot surface igniter or main burner. The
resulting flashback and fire can cause death or serious burns to anyone
in the area. This water is equipped with a FV sensor for detecting the
presence of flammable vapors, see Figure 3. When the sensor detects
those vapors, the unit will shut down and not operate. Should this
happen, please refer to the troubleshooting guide on pages 28-30.
Troubleshoot step 14-15 says
replace the FV sensor
call tech assistance number that shows on water heater
AO Smith will refer you to a plumber
I don't believe homeowner can buy these parts due to Federal regulations
The shorted FV sensor probably saved you a flash-over
The cost of 2nd degree burns from a flash-over would be astronomical.
Fortunately you're ok, and the other folk in the room are ok.
In the old days.
Two guys I knew, winter 1978 Chicago, were laying VA tile using the black mastic.
They were killed and the house burned down because of the water heater.
Main office marked the event with a memo saying they still owed money on their account.
The only company with a re-settable FVIR that I'm aware right now is Bradford White
Bradford White Defender FVIR is resettable without buying parts.
Posted on Oct 25, 2010
SOURCE: water hearer gas valve locked
If water heater has FV event, check your manual for re-setting procedure.
Look at label on side of tank for brand and model number of your water heater:
My understanding is that Bradford White has resettable FVIR but all other manufacturers require service technician for part replacement.
I have found one internet thread that covers do-it-yourself FV.
I also posted same question on water heater forums, and nobody will answer 'due to liability concerns.'
This leads me to believe there are serious safety issues that could lead to manufacturer and-or plumber liability since FV-lock-out mandates were written to reduce widespread insurance property and casualty losses.
Posted on Apr 19, 2011
Most likely: Combustion chamber got too hot because air intake is clogged with dust, causing less air to flow upward through vent pipe ... the slowed flow of air caused combustion chamber to overheat.
What brand and model water heater?
Look at label on side of unit and add comment.
Otherwise call service tech to repair/ replace water heater and clean arrestor screen (air intake) and replace or reset parts as needed, depending on model number and brand water heater.
AO Smith, Bradford white, and Rheem are main manufacturers.
Each has slightly different repair protocol, and each gas control valve can also be different. So more information is needed.
Identify gas control valve:
Rheem TRD/ FVIR glass vial
How to remove combustion parts to inspect for Rheem glass vial and clean arrestor screen located under combustion chamber:
Posted on Oct 01, 2012
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