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How to Install and Use a Noritz Remote Controller

Noritz remote controllerNoritz remote controller
(photo: amazon)

Looking to take control of your Noritz tankless water heater?

This step-by-step guide will show you how to install and use the Noritz remote controller RC-7646M-2. With this remote controller, you can easily adjust the temperature, monitor your water heating operation, and troubleshoot any issues that arise.

Let's get started!

Features of the Noritz remote controller

Digital display

The Noritz remote controller RC-7646M-2 is a handy device that allows you to change the temperature, monitor water heating operation, and troubleshoot problems.

The controller comes with a digital display that shows the actual exiting hot water temperature in Fahrenheit or the water flow rate in gallons.

Additionally, it features an indicator that shows when the burner is on and a priority indicator that lets you set the hot water temperature. If you encounter a problem with your water heater, an error code (such as 11, 90, 99, etc.) will appear on the display.

You can find a list of all error codes commonly found on Noritz tankless water heaters.

Temperature setting buttons

The temperature setting buttons on the controller are labeled as the up and down arrows, and they allow you to adjust the hot water temperature at the exit of the heat exchanger and water heater, and to set the flow meter alarm. It's worth noting that the unit is preset at 110°F when new.

Power button

The power button serves a dual purpose - it can be used to turn the water heater ON or OFF, as well as to mute the sound by holding it down for five seconds.

Flowmeter alarm

The flow meter alarm set button triggers the alarm after the preselected volume of water, in gallons, is delivered by the Noritz tankless water heater.

How to install a remote controller

The remote should be installed in an easily accessible location and not exposed to water, steam, and chemicals, or direct sunlight. It can be installed outdoors but in the waterproof box since the unit is only water-resistant, not waterproof.

Either you are using one or two Noritz water heaters (using the Quick Connect Multi-System), only one remote controller should be installed (to one unit).

  • Remove the front cover of the water heater by removing the four screws.
  • Run the remote controller cord into the unit but keep enough slack so when you remove the unit from the wall, the cord will not break.
  • Connect the terminals at the end of the controller cord to the terminal block and secure it with the clamp - Y-shaped terminal that connects to the water heater, a white connector to the remote controller (see the picture above). For the extension, you can buy a cord or use the 18 gauge wire with a length up to 300 ft.
  • Put the front cover back.
  • Attach the controller to the wall by using the wall anchors, and tie the redundant cord to outside the heater.

How to use a remote controller

  • Press the On/Off button to start.
  • The display will show the preset temperature of 110 F.
  • Use the up (increase) or down (decrease) arrow to select the desired temperature.
  • The temperature range is between the minimum of 98 F and maximum of 140 F.
  • The recommended temperature range is between 120 F and 125 F.
  • Temperatures above 125 F can cause scalding, and the display will flash for 10 seconds.
  • Be aware of the risk of scalding, especially if there are children around.

How to use the Flow meter alarm

  • Press the Power On/Off button
  • Set the water temperature on the Up/Down arrow
  • Press the flow meter alarm button to increase or decrease the settings

When the water flow reaches the set level, the alarm will sound for ten seconds. Stop the water manually, or it will continue running (the burner ON light is OFF). You can set the water flow from 10 gallons to the maximum of 990 gallons, with the 5 and 10 intervals. This great feature can be used, for example, to indicate when a hot tub is full (if hot water is not used for another application).

Resetting the service warning

  • Set the Power On/Off button to the Off position.
  • Press the Flowmeter alarm and hold it for 2 seconds.
  • Push the button several times until it shows "7 oF".
  • Press the setting button (arrow up) for more than 5 seconds.
  • Push the Power On/Off button again.
  • The preset temperature is shown.

Troubleshooting using error codes

To troubleshoot problems with your Noritz tankless water heater, the remote controller can be a helpful tool. When a problem occurs, a numerical error code will flash on the controller's display, along with the priority light and On/Off button.

You can refer to the Noritz error code list for more information on how to diagnose and fix the issue.

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