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  #1  
Old 01-19-2012, 06:57 PM
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Jason,
Give me a call, I'm at home right now with a sick kid but can probably walk you through it.
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Old 01-19-2012, 07:58 PM
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I found the parts list and I need some help identifying the flame sensor.
I believe it is part# 25 called fv sensor.

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Old 01-19-2012, 08:39 PM
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does the hot surface igniter glow red hot while the unit is trying to ignite?
the FV sensor is a Flamable Vapour sensor, it will lockout the unit if vapours are present, gas vapours, paint vapours, etc.
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Old 01-19-2012, 09:05 PM
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When I turn on the tank the fan turns on, glow plug heats up, burner ignites for 5-10 min. and then it shuts off. It cycles twice then turns off and goes into vacation mode.

is the fv sensor the metal rod that has to be cleaned?
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Old 01-19-2012, 09:36 PM
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Now I'm confused, my hot water heater is working again.
Seems to be related to cold weather because it was -30 when it stopped and today it's -18 and its working .
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Old 01-19-2012, 09:41 PM
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Quote:
Originally Posted by bignose View Post
Now I'm confused, my hot water heater is working again.
Seems to be related to cold weather because it was -30 when it stopped and today it's -18 and its working .
I would suspect a problem with the vent or the pessure switch for the vent, extreme cold and or high winds could cause an abnormal pressure.
The pressure switch is # 27
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Old 01-20-2012, 10:24 PM
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the water heater must have a flame sensor, it must be part of the hot surface igniter therefore not shown on the parts list,, located at the bottom of the heater beside the burner, it should be a rod a couple inches long that will be hit by the burner flame when the burner is lit, that will be need to be cleaned with some sandpaper.
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Old 01-20-2012, 10:55 PM
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What do mean by vacation mode? I agree that a o smith gas valves are junk, but resetting temperature is not something they do. The LEDs are telling you a code, that code should be in the book. Start there. Here's a manual for the GDP
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Old 01-19-2012, 09:47 PM
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Quote:
Originally Posted by bignose View Post
Now I'm confused, my hot water heater is working again.
Seems to be related to cold weather because it was -30 when it stopped and today it's -18 and its working .
Is the water heater running on natural gas or propane?
propane pressure is affected by the cold.
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Old 01-19-2012, 11:56 PM
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could have been with the extreme cold in Edmonton might of had a ice build up blocking part of the exhaust vent.
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