Rheem Flammable Vapor Sensor Reset Problem [4 Easy Solutions]

Sometimes the flammable vapor sensor of your Rheem water heater gets locked out and can’t be reset. This is known as the rheem flammable vapor sensor reset problem. For this problem, your Rheem water heater won’t work. In this guide, we will discuss 4 reasons and solutions to this problem. 

These reasons are gasoline or other flammable gas around the flammable vapor sensor, flammable vapor sensor resistance is out of range, wiring to flammable vapor sensor is faulty, and faulty gas control. We declare that this guide will help you to solve the flammable vapor sensor reset problem easily.

Rheem Flammable Vapor Sensor Reset [4 Easy Solutions]

The flammable vapor sensor reset problem on your Rheem water heater can be very painful for you. Particularly when you don’t know how to fix it. To remove your pain, we have come up with 4 reasons and solutions to this problem. Therefore, let’s begin with the main discussion.

Note: You can also read how to fix Rheem water heater 6 3 flashes.

1. Gasoline Or Flammable Gas Around Flammable Vapor Sensor

If you paint something near your Rheem water heater, then gasoline or other flammable gas is created and it will be detected by the flammable vapor sensor. As a result, the flammable vapor sensor will go into lockout or reset problem starts and your Rheem water heater will not work. For this problem, your Rheem water heater will also show 7 flashes.

Solution:

To solve this problem, you need to check for flammable vapors around your Rheem water heater. If you find any flammable vapors, then you need to reset the gas control valve.

To reset it, firstly, unplug the blower during start-up, and leave it unplugged for a minimum of five seconds. Then, you need to plug back in and wait for three seconds for the system self-diagnostic check. 

Within the first thirty seconds, the temperature dial should be turned back and forth crossing the 120-degree mark a minimum of 6 times. It will reset the gas control valve, show a normal flash code that is slow blinking, and your Rheem water heater will start working.

2. Flammable Vapor Sensor Resistance Is Out Of Range

Sometimes, the flammable vapor sensor resistance can be well down or well above parameters. The parameters are from 9 kiloohms to 45 kiloohms. As a result, the flammable vapor sensor reset problem occurs and your Rheem water heater will not work.

Solution:

Firstly, you need to check whether the flammable vapor sensor resistance is between 9 kiloohms to 45 kiloohms. If the flammable vapor sensor resistance is less than 9 kiloohms or more than 45 kiloohms, then you need to replace the flammable vapor sensor to solve the problem.

3. Faulty Wiring To Flammable Vapor Sensor

If the wiring to the flammable vapor sensor is faulty, then the flammable vapor sensor reset problem happens. As a result, your Rheem water heater will not work.

Solution:

In this case, you need to replace the flammable vapor sensor and wiring harness to solve the problem. Still, if the new flammable vapor sensor doesn’t work, then you need to replace the gas control to solve it.

4. Faulty Gas Control

Sometimes, the gas control of your Rheem water heater can be faulty, causing the flammable vapor sensor reset problem. It also causes your Rheem water heater not to work.

Solution:

You need to replace the gas control of your Rheem water heater to solve this problem.

FAQ

How To Test Flammable Vapor Sensor?

Firstly, remove the flammable vapor sensor from its bracket on the base ring of your water heater and disjoint both wires to the sensor. Now, you need to take a resistance reading between the 2 wiring terminals of the flammable vapor sensor and record the resistance value. You need to use an ohmmeter for this and it needs to be capable of reading up to 2,000 kiloohms.

How To Bypass Vapor Sensor On Water Heater?

You can not bypass a flammable vapor sensor on a water heater because it works on resistance, not continuity. You can try moving the flammable vapor sensor outside for some time and it might reset itself. It means that the resistance might fall back within range. 

How To Replace Vapor Sensor On Water Heater?

If you have a bad flammable vapor sensor on a water heater, then you need to replace it. Multiple big-box chains such as Lowe’s and Home Depot will not likely carry these parts, but a dedicated plumbing company may carry them. You can also find these parts on eBay and Amazon.

How Does Flammable Vapor Sensor Work?

A flammable vapor sensor works by altering its resistance when exposed to flammable vapors and other elements such as cleaners used near the sensor. When the resistance goes out of the designated range, the sensor senses this and will not allow your water heater to fire up. The water heater will fire up if the resistance is in the correct range.

Do Rheem AC Units Have A Reset Button?

Yes, the Rheem air conditioner units do have a reset button. The reset button is located nearby the copper lines on the outside at the bottom of the air conditioner.

Conclusion

Solving the rheem flammable vapor sensor reset problem of your Rheem water heater can be difficult. And it becomes more difficult when you do not know the reasons and solutions to this problem. To solve your difficulty, we have come up with the 4 reasons and solutions behind the flammable vapor sensor reset problem.

We are hopeful that this guide will help you to solve the flammable vapor sensor reset problem easily. If your problem has not been solved after trying all the solutions described in this guide, or you have any new reasons behind this problem, then let us know in the comment box. We will try our best to solve the problem as soon as possible.

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