Rheem Tankless Water Heaters

This error code indicates that certain maintenance tasks, such as flushing the heat exchanger or replacing a water filter, should be completed before attempting to clear the code. The unit will not operate normally until this is done.

The 'Alarm/Error Indicator' light illuminates when the water heater detects a fault or requires attention. The specific issue may be displayed on the LED screen or indicated by an error code.

This is a critical safety warning. Before attempting any service or maintenance on the water heater, you must turn off the electrical power at the main disconnect or circuit breaker. Failure to do so can lead to death or serious injury.

For optimal performance and safety, it is recommended to connect the water heater to its own dedicated electrical circuit. This prevents potential issues caused by other appliances sharing the same circuit.

The water heater should not be connected to a Ground Fault Circuit Interrupter (GFCI) or Arc Fault Circuit Interrupter (AFCI) protected circuit. These types of circuits can interfere with the proper operation of the water heater.

Using adapters to connect the 3-prong power cord to a 2-prong outlet is unsafe and not permitted. The water heater requires a proper ground connection, which these adapters bypass.

Connect the water heater directly to a grounded electrical outlet. Do not use power strips or adapters that allow multiple devices to be plugged into a single outlet, as this can lead to unsafe conditions or operational issues.

An undersized or improperly configured gas supply system can cause operational problems with the water heater. This can also affect the performance of other gas appliances connected to the same system.

The 'In-Use Indicator' light is lit. This confirms that the water heater's burner is currently active and heating water.

The LED display on the built-in control shows 'oF'. This temporary display indicates the system is processing the activation of the water saving control.

Power should not be connected to the water heater until the venting system has been fully installed. This ensures the unit operates safely and correctly from the start.

When power is connected for the very first time, the water heater requires a 90-second period to initiate its startup sequence. Please allow this time before expecting the unit to operate.

Scale buildup within the heat exchanger can reduce hot water output. This often requires professional attention.

The red LED on the control board is flashing, and the display shows 'ON'. This indicates that the water saving control feature has been successfully activated.

The red LED on the control board is flashing twice, and the display shows 'OF'. This means the water saving control is not currently active.

Outdoor Rheem tankless water heaters do not come with a power cord. They must be hard-wired directly to an appropriate power outlet that includes a ground terminal. This ensures a secure and safe electrical connection.

The 'Power On/Off Indicator' light shows the electrical status of the water heater. It will be lit when the unit has power and off when there is no power.

If the gas pressure drop in the system exceeds the limits set by the National Fuel Gas Code (0.3, 0.5, or 3.0 inch W.C.), the water heater may not operate correctly. This is often caused by undersized piping or faulty regulators.

The 'Priority Indicator' light provides information about the operational priority of the water heater within a system, if applicable. Consult specific system documentation for detailed meaning.

The water heater's venting system must be fully installed and meet all dimensional requirements before operation. Incorrect venting can lead to safety hazards and improper functioning.

Ensure all field wiring and electrical grounding meet local codes or national standards (like the NEC in the US or CEC in Canada). Incorrect wiring can result in personal injury, damage to the product, or unsafe operating conditions. Always check for correct operation after servicing.

Installing this water heater at elevations above 2,000 feet (610 meters) requires specific adjustments. Operating without these changes can lead to improper function. Contact an expert for assistance.

The 'WiFi Signal Indicator' shows the status of the connection to your home's Wi-Fi network. Multiple bars indicate a stronger signal, while fewer bars suggest a weaker connection.

The water heater has detected a problem and is showing an error code on the remote control display. Consult the Service Error Code Chart for specific details and solutions.