Manual & Troubleshooting

Rheem Tankless Water Heater Error Code H103 means the high-limit safety switch gets tripped. This safety device will shut off your tankless water heater automatically when the water temperature gets too high.  To reset the error code H103, you should check the high-limit switch and replace it if required. Apart from this, check the burner…

Rheem Tankless Water Heater Code P1 indicates too low water flow that prevents the unit from kicking on. Typically, the water flow gets too low when the cold water inlet filter gets filthy by minerals or deposits.  To clear the error code P1, you must clean the cold water inlet filter. If the inlet filter…

Rheem Tankless Water Heater E5 Code indicates the water flow is too much, and the unit can’t keep up with the demand. As a result, your tankless water heater fails to produce enough hot water and throws the fault code E5.  Limiting the water flow, you can clear the error code E5. You can install…

Rheem Tankless Water Heater makes a beeping noise when it detects a problem and alerts you by leaving an error message on the display. Here are some common reasons behind the beep:  Why Is My Rheem Tankless Water Heater Beeping? Your Rheem tankless water will beep to alert you about a defective water heater unit….

Rheem Tankless Water Heater will not power on or turn on due to one of the following reasons:  To discover each troubleshooting step in detail, keep reading.  Rheem Tankless Water Heater Will Not Power On [7 Easy Solutions] Here are the culprits that cause the water heater to not turn on:  1. Power Cord Isn’t…

This is a complete guide on Rheem Tankless Water Heater Error Codes. In this guide, we will describe the common error codes this tankless water heater displays. Besides, we will also depict those reasons that trigger the error messages and provide the solutions as well. So, let’s get started right here. Rheem Tankless Water Heater…

Rheem Tankless Water Heater Code 29 indicates that the neutralizer is not draining. This error code will flash on the controller display due to:  Below, I will walk you through each troubleshooting step to reset the Rheem error code 29.  Without further ado, let’s dive in.  Rheem Tankless Water Heater Code 29 [5 Causes &…

Rheem Tankless Water Heater Code 76 indicates a communication fault between the remote control and the tankless unit. The error code 76 will pop up on the controller display because of:  Once you address those issues and resolve them, the Rheem error code 76 will disappear. And this guide will take you through the troubleshooting…

Why does my Rheem tankless water heater display the error code 14? Your tankless water heater will throw this error message when the Overheat Film Wrap is at fault. And the Overheat Film Wrap gets activated if the heat exchanger gets too hot.  Improper fuel type, defective heat exchanger, clogged venting system, and faulty Molex…

Error code 13 on Rheem Tankless Water Heater means poor or bad combustion. The unit will throw this fault code due to:  You can easily reset the error code 13 by addressing and troubleshooting those issues. And this guide will walk you through each troubleshooting step to resolve the combustion issue.  Let’s scroll down.  Relevant:…

Rheem Tankless Water Heater Code 12 means flame failure. The flame sensor fails to detect the flame due to:  Throughout this guideline, I will walk you through each troubleshooting step to reset the fault code 12.  Let’s dive in.  Relevant: Rheem Tankless Water Heater Error Codes  What Does Error Code 12 Mean On Rheem Tankless…

In this article:  When Should You Reset Your Rheem Tankless Water Heater? Resetting a tankless water heater will help you avoid general water heater issues like error codes, power outages, or water flow issues.   What happens when you reset the unit is- it will clear the glitches from the control board. But how?  The resetting…