Rheem Tankless Water Heater Error Code 13

Before calling a professional regarding an error code 13 on your Rheem tankless water heater, try to determine if you can resolve this issue yourself. You can usually take a few steps to troubleshoot and save money in the process. The best resource to resolve any code is the manual. It contains all the specific information on your make and model.

Raheem Tankless Water Heater

An error code 13 only displays on indoor Rheem systems. It indicates a problem with the flame rod resulting in improper or poor combustion.

To resolve this issue, check the exhaust venting and air intake. Examine the entire system, and remove anything blocking the vents. Next, verify the altitude settings show your proper location. Then, examine the flame rod FL-24 and look at the blower mower for any defects or problems.

Troubleshooting Areas of Concern

When this error shows up on your water heater, it will immediately shut off. It can happen after several months after you have purchased the tankless water heater and can repeat itself. Before remedying the problem yourself, check to be sure the electrical current is shut off. You do not want to be electrocuted.

When fixing it, you need to:

  1. Recheck if the exhaust vents and air intake are working. If both are not functioning, improper combustion occurs within the machine.
  2. Look for blockages in the exhaust venting. If there aren’t any, look for deposits within the flame rods. If there are deposits, the thermocouples will have to be cleaned with steel wool or grit sandpaper. You may need to replace the flame rod.

These methods generally remove the error code on a Rheem water heater. Homeowners should regularly inspect their system as a preventative measure. Routinely clean the thermocouple, burner, and igniter to prevent the disruption of hot water.

Related: Rheem Water Heater - Ultimate Troubleshooting Guide

Troubleshooting Your Rheem Tankless Water Heater

If there is no hot water, it may be due to a lack of electricity. Should the water from the hot water tap become cold, wait 15 minutes for the gas unit. Then wait 30 minutes for the pressure relief valve to generate enough hot water to be noticeable at the tap. If the water is still cold, the system isn’t heating water. Then it is an electrical issue.

Check your circuit breaker. If it is in the off position, flip it back on. Should it be halfway, this means the breaker has been tripped. Turn it to the off position, then back to on. If the circuit continually trips, an electrical issue needs to be diagnosed by an expert.

If there is no pilot light or it isn’t lit, consult the user manual first. It will instruct you on how to relight the pilot light. Electronic ignitions are sometimes known for not firing. If this is the case, you may have to replace it.

Do not do this yourself, as a gas leak could occur. Call a professional instead.

A lack of hot water can be frustrating. First, try to adjust the thermostat. You may need a flat screwdriver. Place it in the slot on the adjuster and follow the instructions in the manual.

Thermostats should not be higher than 120° F. If it is set any higher, burns can ensure. If the system is not making enough hot water, it may be undersized for your home’s needs. It could also have a clogged gas valve or be clogged with mineral sediments and need cleaning.

For an electric heater, if there is some hot water and you hear the unit working, examine the thermostat’s set point. You may need to adjust it to a higher temperature. However, do not go above 120° F. If the water is lukewarm but not hot/slowly heats, then the heating element or thermostat may need replacing.

To replace, do the following:

  • Turn off the double 240V circuit located in the electrical panel of the heater.
  • When replacing a heating element, close the water to the heater.
  • Turn off the pump’s circuit if there is a pump and well. Open the hot water tap in the tub until the water ceases to flow to take the pressure off the tank.
  • Remove the part and replace it.
  • Use a screwdriver to disconnect wires to the malfunctioning element or thermostat.
  • Place towels on the floor before replacing any element. Loosen the element with the wrench, then grab with the hand. Quickly pull it out, insert the replacement, and hand-tighten the unit. Use a wrench to tighten it so no leaks appear.  Do not overtighten it.
  • To replace the thermostat, take a picture of the wiring before removing it. Install the new unit and consult the picture to ensure it was properly done.

How do I Reset my Rheem Tankless Water Heater?

The Rheem tankless water heater is reset by doing the following steps:

  • Shut the hot water tap off
  • Turn the remote control off
  • Wait for about five minutes before turning the unit back on again
  • Open the hot water faucet

If nothing occurs after resetting the system and the error code is still being displayed, conduct the following steps:

  • Shut off the tap to the hot water
  • Turn off your remote
  • Use an error code guideline to find out why the error is occurring. You can also consult with a professional.

These suggestions will help you to troubleshoot error codes generated with a Rheem tankless water heater. While it may seem complicated, if you follow the step-by-step instructions and consult the user manual, you will quickly solve the problem.

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