Rheem Tankless Water Heater Code 76 (Troubleshooting Guide)

Rheem tankless water heaters have many error codes that make it challenging to pinpoint the exact cause of each error. Among the common error codes is code 76, a sign of a problem with your water heater. As a concerned Rheem tankless water heater user, you may want to know what causes this error code and how to fix it.

The Rheem tankless water heater code 76 may be caused by a defective remote control, faulty remote control wiring, or a faulty filter capacity. Solutions include replacing the remote control’s wiring, changing the remote control, or changing the capacitor.

In the rest of this article, I’ll discuss the causes of Rheem tankless water heater code 76. I’ll also cover how to fix each problem to restore your heater’s normalcy. Let’s get started!

1. A Defective Remote Control

Rheem remote control
Source: https://youtu.be/g3hMOfK3icg?t=30

The Rheem tankless water heater code 76 indicates a communication fault between the remote control and your tankless water heater. One potential reason is a defective remote control.

You can confirm if the remote control is the problem by disconnecting the remote control wiring on the PCB board. After that, connect the water heater directly to an electrical output source and test a hot water source like a shower. If the heater functions well, then there is an issue with the remote control.

How To Fix

Replacing the remote control may solve the code 76 issue and restore communication between the two components. However, It’s essential to use an authentic Rheem replacement remote control for proper functioning. A new remote control should facilitate communication and solve the Rheem code 76 error.

2. Faulty Remote Control Wiring

Aside from a defective remote control, faulty wiring may also lead to the Rheem tankless water heater code 76 error. The wiring may become loose or corroded over time, hindering communication between your remote control and the water heater.

repairing water heater

Confirming that the remote control’s wiring is the issue before fixing it will save you resources and time.

A jumper wire will help you confirm the remote control wiring problem. Connect a jumper wire to the remote terminal on the printer circuit board and try powering on the water heater using the remote control. If the water heater comes on, then the remote control’s wiring is at fault.

How To Fix

You can fix this problem by replacing the wiring connecting the remote control and PCB board. Before testing a hot water source, you must ensure that all connections are properly secured. Loose connections may still result in the code 76 error.

3. Faulty Filter Capacity

In rare cases, Rheem tankless water heater code 76 may indicate a problem with the filter capacitor. The filter capacitor may become clogged and damaged over time, hindering its capacitance capability. Consequently, this affects the communication between your remote control and the water heater.

A faulty capacitor is usually the problem if the error code 76 flash persists after fixing the above two issues.

You can confirm if the filter’s capacitor is at fault by checking the water heater’s control board. The disk capacitor across the remote control terminal should range from 7.5 to 10 microfarads. A lower or higher value indicates a faulty capacitor.

How To Fix

Replacing the filter’s capacitor should solve the Rheem tankless water heater code 76 error and restore communication between your remote control and the water heater.

You must use an authentic Rheem tankless water heater replacement capacitor for efficient operation. Buying a different capacitor may only provide a temporary solution.

Expert Tip: You should avoid electrolytic capacitors because it’s difficult to identify their polarities. Instead, go for non-electrolytic capacitors like ceramic or film capacitors. You can only use an electrolytic capacitor if you know its polarity.

Related Posts:

Care Tips for Rheem Tankless Water Heaters

Rheem tankless water heater error codes result from defects. The good news is that you can prevent most of these defects by taking good care of your water heater.

fixing water heater

Here are some care tips for Rheem tankless water heaters:

  • Clean the heat exchanger regularly. With time, the heat exchanger may become clogged with mineral deposits. This hinders the efficiency of your water heater and may even lead to error codes. You should use a descaling solution to clean the heat exchanger annually or as the manufacturer recommends.
  • Maintain venting systems. The combustion process in your water heater produces harmful gasses like carbon monoxide. The venting systems ensure that these gasses are released adequately outside the house. Thus, you must maintain and clean your venting system to avoid error codes and ensure the safe operation of the water heater.
  • Regularly inspect gas and water lines. The gas and water lines may become loose or corroded over time, leading to leaks or faulty operation. Checking these lines regularly allows you to notice any leaks in good time and repair them.


Rheem tankless water heater code 76 may be due to a simple issue like a loose remote control wiring. In other cases, the error arises from a complex problem like a defective filter capacity.

Understanding the symptoms to look for will make it easier to fix the error. Alternatively, you can test each potential error and devise a suitable solution.