Norcold Models 8652, 8653, 8662, 8663, 8682, 8683

This page shows how to install the Fridge Defend on Norcold Models 8652, 8653, 8662, 8663, 8682, 8683 and provides troubleshooting information.

Before reading this page, please click here and view our wiring video.

Click here and view our ARP sensor install video.


Table of Contents

Instructions: Subjects are listed on left. Click the link to the right to go directly to the subject matter on this page.

Norcold 682 Cooling Unit

Norcold 86xx Series

This drawing shows the view looking into the vent door at an 86xx series fridge. These refrigerators were exceptional RV fridge, the number of units still in operation attests to this fact. To keep these excellent refrigerators alive it is recommended to keep the boiler of the fridge from overheating with the Fridge Defend by ARP. This page is an overview of how to install the ARP.

Recall Wiring Example 5

Wiring: 8652, 8662, 8682

Please click this link for wiring on the 2-Way fridge models.

Dometic Norcold Wiring

Wiring: 8653, 8663, 8683

We do not recommend using the 12VDC (3rd-Way) for cooling your fridge because the 12VDC heater can destroy the fridge if the Fridge Defend by ARP is not protecting the fridge. If the Fridge Defend is being used to control boiler temperature, it is not unusual for the controller to trip due to the 12VDC heater. One can just disconnect the 12VDC heater if you choose not to use it, otherwise click on the following link for wring a load relay:

Please click this link for wiring on the 3-Way fridge models.

Norcold N641

Install Boiler Sensor -- Boiler Housing

This photo shows a Norcold 8652 with the door to access the electric heaters opened to install the boiler sensor.

The red arrow points to the cooling unit boiler tube at the approximate location where the Fridge Defend boiler sensor will be installed. On this cooling unit the flue tube is behind the boiler tube, this makes the installation on the 600, 6000, & 6100 series very easy. Please make sure the temperature sensor is insulated as per the example on the Boiler Temperature Probe Install page.

The yellow arrow points at the slot where the cooling unit heater access door tab is engaged. Press the housing together to disengage the door latch.

The orange arrow points to the electric heating element, the electric heating element is always attached to the cooling unit boiler tube.

Fridge Defend Sensor 6062

This photo shows the Fridge Defend boiler sensor clipped onto the boiler tube. The insulation is placed under the ARP boiler sensor wire, the wire should also be wrapped with insulation where it exits the boiler housing to keep the sheet metal from cutting it. The entire sensor shall be insulated so that ambient air cannot enter the boiler housing.

Please note that all of the following specifications are believed to be accurate. If any errors are found, please bring them to our attention as soon as possible. For critical specification please contact Norcold as they make changes to their specifications without notice.

Specifications: 8652, 8653, 8662, 8663, 8682, 8683

Item Value Units
ARP Control Boiler Temperature See Note 1 Below
Off-Level Operating Limit See Note 2 Below
AC Heater 2.9 Amps @ 120VAC
AC Heater 41.3 Ohms +/-10%
DC Heater 13.8 Amps @ 12VDC
DC Heater 0.07 Ohms +/-10%
Temp Setting Range 1 - 5 5 = Coldest | See Note 3 Below


Note 1: 185-195°C - 365-383°F

Note 2: Dependent on ambient and ARP boiler temp.

Note 3: Thermistor Values