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DSI Fault: 3 Time-Saving Methods to Reset It

If you are dealing with a DSI fault, it can be incredibly frustrating. Fortunately, there are some time-saving methods that can help you reset the fault quickly.

In this blog post, we will discuss three methods for resetting a DSI fault and provide an additional note to help you understand the process better. Keep reading to learn more about how to get your device working again.

DSI Fault Meaning On An RV: An Intro

When traveling in an RV, the last thing you want to worry about is the hot water not working. A common issue that can arise is a “DSI Flt” code. This DSI flt can be confusing, so let’s dive into what it means.

  • The acronym “DSI” stands for Direct Spark Ignition.
  • It is a newer ignition method than older forms like Pilot Lights or Standing Pilots, which are now considered obsolete.
  • The DSI uses the Control Board to turn on the gas when the spark ignites.
  • This safer method of ignition helps to conserve energy and ensure safe operation.

What Is It Really?

When a DSI fault occurs, the Control Board has determined that the water heater has exceeded a specific temperature and turned off the ignition as a safety precaution. Many things, including a faulty thermocouple, clogged burner ports, or a misaligned flame sensor, can cause this.

Causes of DSI Fault

However, the most common cause of this fault code is usually because of dirt and dust particles accumulating in the burner port.

The 8 Different Reasons Leading To Direct Spark Ignition

Understanding the potential causes of a DSI fault on an RV is essential to diagnose and repair the problem. In some cases, the root of the problem may be an issue with the vehicle’s electrical system. Below are several of the many reasons why an RV may suffer a DSI flt.

  • Control Board Issues: The DSI control board can malfunction due to a power surge or faulty wiring. This will cause the DSI to fail and stop working.
  • Check Valve: If the check valve is not working correctly, it can prevent the gas flow.
  • No Airflow: If there is no airflow in the exhaust system, the DSI will not ignite the gas flow system and will fail.
  • No Water in Tank: If there is no water in the tank, the pressure switch won’t detect any pressure and, therefore, won’t allow the gas to flow through the system and lead the DSI to fail.
  • Bad ECO: A bad exhaust gas flow system combustion oxygen sensor can cause the exhaust to have too much oxygen, which can cause the DSI to stop.
  • Faulty Thermostat: If the thermostat is not calibrated correctly, it can lead to incorrect temperatures in the system, resulting in the DSI breaking down.
  • Boiler Safety Circuit Board: If this board is not functioning correctly, it can shut off the gas supply and cause the DSI to fail.
  • Out of Gas: If there is no gas in the tank, the DSI cannot ignite it and will fail.

DSI Fault Light: The Different Methods For Resetting This Fault In You’re RV

Resetting this fault is necessary to ensure your RV’s water heater functions correctly. It can cause inconsistent hot water performance and other problems without resetting the fault. Let’s take a look at different methods to reset the fault.

Switch Off The Power

When an ignition fault occurs, the first step is to turn off the DSI fault light and power to the water heater. This will ensure no further damage is done and can help prevent any additional issues.

DSI Fault Switch Off The Power

A Step By Step Procedure

To do this:

  • Turn off the pilot light and breaker at the electrical wh panel, or unplug the cord from the outlet.
  • If your hot water heater is powered by propane, turn off the energy source.
  • After the power has been shut off, wait about 30 minutes before resetting the fault and also check the valve. This will give the water heater time to cool down and reset itself.

Depressurize The Propane Tank

It is essential to separate the propane gas supply from the water heater to reset a DSI flt.

  • This can be done by shutting off the gas supply at the tank and then disconnecting the heater from the propane tank.
  • Make sure that you have a suitable wrench to loosen the connection.
  • Once the connection is loose, unscrew the fittings and separate the water heater from the propane supply.
  • Ensure all lines and fittings are completely disconnected and sealed to prevent further issues.

Connect The Hot Water Heater To 120V

If the DSI flt is still not reset after turning off the power and disconnecting the tank of propane, you may need to hook the water heater up to a 120-volt supply. This step will require an electrician. It should only be done if all other methods of resetting the fault have failed.

Connect The Hot Water Heater To 120V
source: https://www.irv2.com/forums/f112/water-heater-wiring-423166.html
Connect The Hot Water Heater To 120V (2)
source: https://www.forestriverforums.com/forums/f27/electric-water-heater-switch-99282.html


To hook up the water heater for hot water to a 120-volt supply:

  • First, turn off the power to the heater at the circuit breaker box with the help of a reset button.
  • Then, use a screwdriver to loosen the bonding jumper screws at the top of the heater.
  • Once these screws are loosened, use two lengths of wire to connect the ground terminal on the upper right side of the water heater to the neutral terminal on the lower left side.
  • Finally, use a third length of wire to connect the hot terminal (on the lower right) to the 120-volt supply.

Once all these steps are completed, turn the power to the heater. This should reset the fault, allowing the heater to operate normally. If not, check the connections to ensure they are secure and retry resetting the DSI FLT light.

Note: If you cannot reset the pilot light, and it continues to occur, contact a professional to diagnose and repair your water heater. Do not attempt to make any repairs yourself, as this could cause further damage and safety risks.

Safety Steps

Also, ensure all safety precautions are taken when working on or around a water heater.

  • Wear protective clothing and safety glasses to protect against hot liquids or steam splashes.
  • Also, be aware of any electrical hazards and shut off the power from control board before attempting any work.
  • Make sure you have an understanding of basic electrical wiring before attempting any electrical work on your unit.
  • Finally, never operate the unit if you smell or believe a gas leak is in the area.
  • Contact your local gas company immediately if there is suspected gas in the stove burners
DSI Fault Safety Steps

The 5 Best Safety Measures To Stop DSI Fault In The Future

Succeeding are five unique steps to stop this DSI flt in your RVs in the future.

Regular Maintenance And Inspection

The first and foremost suggestion to prevent DSI fault code in RVs is to conduct regular maintenance and inspection. It can help identify potential problems before they become big issues like:

  • Saving RV owners’ time
  • Money in the long run.

Keep The RV Clean And Dry

Always keep your vehicle clean and dry. Moisture and dirt can cause problems with the DSI system, leading to issues like:

  • Spark failure
  • Incomplete combustion in stove burners.

Regular cleaning of the RV's surface, including the roof and undercarriage, can help prevent moisture buildup and reduce the risk of rust and corrosion.

Keep The RV Clean And Dry

Use High-Quality Parts And Components

RV owners should always use genuine parts and components when substituting DSI-related parts like circuit board, reset button or power switch. Using cheap or inferior quality parts can lead to:

  1. Premature wear and tear.
  2. Reducing the lifespan of the DSI system.
  3. Increasing the risk of faults.

Ensuring that any replacement parts are compatible with the RV's DSI system is vital.

Install Carbon Monoxide Detectors

Installing carbon monoxide detectors is another precaution to prevent DSI faults in RVs:

  • Carbon monoxide is a harmful gas for health and can also lead to death.
  • DSI faults can cause carbon monoxide buildup in the RV, making it crucial to install carbon monoxide detectors.
  • These detectors can alert RV owners of any potential danger.
DSI Fault Install Carbon Monoxide Detectors

Seek Professional Help

Finally, if RV owners suspect any issues with the DSI system, they should seek professional help. Attempting to fix DSI faults without the proper knowledge and expertise can lead to further damage and risk.

Hence, it is crucial to seek the help of qualified professionals who can diagnose and fix any issues related DSI faults code, reset button, or slam shut.

Fixing The DSI By Yourself

If you are experiencing issues with your RV's Direct Spark Ignition (DSI) system, you can fix it yourself. To reset the DSI:

  • Locate the reset button on the access wh panel.
  • Use a screwdriver to press it.

It is important to note that each RV is different, so consult the owner's manual for specific details. Also, videos are available online to help reset the heater.

If air has built up in the line, run the stove burners to flush it out for a minute. Also remember that replacement control boards for DSI systems usually cost about $200.


What does DSI mean on a water heater?

DSI stands for Direct Spark Ignition, a system that allows a water heater to be automatically lit by a switch inside the RV.

What is a water heater reset button?

An RV water heater reset button is an important safety feature because it turns off the power to the water heater if there's a problem like overheating. This reset button helps protect your RV from potential damage and reduces the risk of a fire due to an electrical malfunction.

What is DSI vs. FLT?

DSI (Direct Spark Ignition) is an electronic ignition used in water heaters and furnaces, while FLT (Failed Lockout Try) is an error fault code displayed when the DSI ignition fails to start.

What is a DSI furnace?

A DSI furnace is a type of furnace that uses an electronic spark for ignition and relies on pressure switches and flame sensors. Fever limit, controls for safety. DSI furnaces are energy-efficient, reliable, and cost-effective, making them a popular choice for many homeowners.


In conclusion, DSI fault can be a frustrating problem for RV owners. However, it can be reset easily By turning off the power, disconnecting the propane tank, and hooking the water heater to 120V. Additionally, if you have a faulty electrical system or a clogged pilot tube, you may need to hire a professional to help you fix the problem.

To ensure that this doesn't happen again, make sure that you regularly maintain and inspect your RV. We'd love to hear from you in the comments section below if you have any questions or feedback on this article.

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