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My Lochinvar DVN041 water heater sometimes does not fire. The blower comes on and the electronic pilot lights but it will sometimes cycle off without the gas valve kicking on. I think it may be a bad igniter wire/thermo couple. If I power it off and wait 5 minutes it will usually go the second time.. any ideas?

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Flame sensor could be dirty which would explain why it sometimes comes back on after reseting the tank.

Posted on Jul 29, 2010

  • jyoung42 Jul 18, 2011

    I removed the burner unit and cleaned it but the next day it did the same thing. I did see the green led light on the Robertshaw controler was flashing

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What should I do if my pilot light is out


There should be an electronic igniter with instructions on how to start it right on the heater.

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1) Copy following link to troubleshoot by type of gas control valve:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

2) Otherwise Rheem-Ruud does not post service manuals
http://www.ruud.com/products/tank_water_heaters/gas_water_heaters/

3) Sound like bad gas control valve thermostat.
Newer Honeywell electronic controls can be replaced without draining tank.
Older mechanical controls are replaced by removal from tank after tank is drained.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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Pilot light won't stay lit on new water heater


1) Get more air to the water heater and see if problem continues.
2) Read the following pdf-s for things that might apply to your situation.
http://waterheatertimer.org/images/Negative-pressure.jpg
http://waterheatertimer.org/pdf/Attic-Ventilation-and-Pilot-Outage-in-Gas%20Water-Heaters.pdf
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf

3) Read pdfs above first, and then Add a comment with missing information below, for possible do-it-yourself help.
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Where is water heater located? Hot attic? Closet? Garage? Is area dirty and dusty? Has air intake been cleaned?
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Certain Rheem water gas water heater models feature electronic controls with a flammable vapor sensor installed on the bottom portion of the water heater unit. This sensor is designed to shut off your water heater system to prevent fires in case flammable vapors are present within the area. If your flammable vapor sensor caused your water heater to shut down, check the area immediately for leaking gas or other flammable products. Common household chemicals such as bleach can also trip the safety system as well as unsuccessful burner ignition attempts.


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  2. Step 2 Turn on your multi-meter and set it to read resistance or "ohms". Connect one of the multi-meter's probes to the number two pin and the other probe to the number three pin of the Molex connector (middle black wires). If the reading on your multi-meter reads below 9k or above 45k ohms, the flammable vapor sensor is faulty and in need of replacement; you cannot reset the system until this issue is resolved.
  3. Step 3 Reconnect the Molex connector to the bottom of the control pad, reconnect the water heater's power if and turn the blower switch to the "ON" position. Press both the left and right buttons on the control pad at the same time. Wait for the green light on the control pad to blink and press the following buttons in sequence: Left, Right, Left, Left, Right, Left, Right, Right (you will need to perform these actions within 30 seconds of reconnecting the power cord to the water heater in order to be successful

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I have atwood pilot relight model gc6aa-8 pilot will light but after tank heats up & there is no call for hot water,pilot is out and very hard sometimes impossible to relight.


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