Possible cause s corrective action.
American water heater sensor failure.
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American water heaters troubleshooting guides.
Example tank is a john wood 40 gallo.
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Common problems and how to fix them.
Internal sensor failure the information on this web site is supplemental to the printed instructions that came with your water heater.
Selecting your water heater repair or replace.
Look up the manufacturer s chart for sensor resistance at various temperatures and figure out what your resistance.
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The flame inside the water heater will become lazy and wander around causing the temperature sensor inside the thermocouple to trip.
How to diagnose and repair a faulty atmospherically vented gas fired water heater.
Check with gas utility company.
Now drain 1 gallon of water from the bottom of the tank as quickly as you can and get an accurate temperature reading.
Selecting your water heater repair or replace.
If you can t fix the problem notify a water heater service organization.
To reduce the risk of property damage serious injury or death read and follow all labels on the water heater and the safety instructions in the printed owner s manual.
Is your water heater showing a flammable vapor sensor code.
5 replace gas valve this indicates a sensor failure and the gas control valve must be replaced.
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Water heater too small.
Drain about 4 to 5 gallons of water out of the drain valve at the bottom of the water heater and throw it out.
When a down draft is created the combustion products from the water heater can no longer exit up through the vent system.
Sediment or lime in tank.
7 replace gas valve overall failure of the gas valve and will usually require replacement.
Luckily that error code can easily be reset and you will have hot water again in less then an hou.