Norcold Polar N8X - User Manual

© 2017 NORCOLD, INC. All rights reserved.
Part No. 639410 Rev. A 04.17.2018
Service Manual
Gas Electric Refrigerators
Questions? 1-800-444-7210
Improper installation, adjustment, altera-
tion, service or maintenance can cause
personal injury or property damage. Refer
to this manual. For assistance or addition-
al information, contact a qualied installer,
service agency, or the gas supplier.
Polar 7 Series (N7V, N7X, N7LX) Models
Polar 8 Series (N8V, N8X, N8LX) Models

Summary

Safety Precautions

General Safety Guidelines

Signal Word Definitions

Propane Gas & Electrical Safety

Refrigerator Specifications

Model Series Specifications (N7 V;N8 V, N7 X;N8 X, N7 LX;N8 LX)

Dimensions, DC, AC, and Gas Specs

Propane Gas Connections

Propane Pressure and Safety

Electrical Connections

AC and DC Power Connection Guide

Main Control Board Fuses

DC and AC Fuse Identification

Preventative Maintenance

Annual Maintenance Tasks

User Interface - N7 V;N8 V Models

N7 V;N8 V Control Panel Layout

Fault Codes - N7 V;N8 V Models

Fault Code Display via Flash Patterns

Explains how fault codes are displayed via flash patterns on the indicator light.

Fault Code Reference Table

Table mapping flash patterns to fault meanings and recommended actions.

Troubleshooting: Solid Red Indicator Light

Diagnosing Solid Red Light Fault

Flowchart for diagnosing a solid red indicator light, checking power, fuses, and burner.

Troubleshooting: Flash Pattern 1

Troubleshooting: Flash Pattern 2

Troubleshooting: Flash Pattern 3

Troubleshooting: Flash Pattern 4

Troubleshooting: Flash Pattern 5

Troubleshooting: Flash Pattern 8

Troubleshooting: Flash Pattern 9

Troubleshooting: Flash Pattern 10

Troubleshooting: Thermistor Fault

Diagnosing Thermistor Fault

Flowchart for diagnosing thermistor faults, checking wiring and resistance.

Troubleshooting: Blank Display

Diagnosing Blank Display Issue

Flowchart for diagnosing a blank display, checking DC voltage, fuses, and wiring.

User Interface - N7 X;N8 X Models

N7 X;N8 X Control Panel Layout

Fault Codes - N7 X and N8 X Models

N7 X;N8 X Fault Code Flash Patterns

Explains how fault codes are displayed via flash patterns on the power ON/indicator light.

Fault Codes - N7 X;N8 X Models

N7 X;N8 X Flash Pattern Reference

Table mapping flash patterns to fault meanings and recommended actions for N7X/N8X models.

Troubleshooting: Solid Red Indicator Light (N7 X;N8 X)

Diagnosing Solid Red Light Fault (N7 X;N8 X)

Flowchart for diagnosing a solid red indicator light, checking power, fuses, and burner.

Troubleshooting: Flash Pattern 1 (N7 X;N8 X)

Diagnosing Flash Pattern 1 (AC Heater)

Flowchart for diagnosing Flash Pattern 1 (AC heater fault), checking wiring and resistance.

Troubleshooting: Flash Pattern 2 (N7 X;N8 X)

Diagnosing Flash Pattern 2 (Internal Fault)

Flowchart for diagnosing Flash Pattern 2 (Internal control fault).

Troubleshooting: Flash Pattern 3 (N7 X;N8 X)

Diagnosing Flash Pattern 3 (Limit Circuit)

Flowchart for diagnosing Flash Pattern 3 (Internal control fault).

Troubleshooting: Flash Pattern 4 (N7 X;N8 X)

Diagnosing Flash Pattern 4 (AC Heater Relay)

Flowchart for diagnosing Flash Pattern 4 (AC heater relay stuck).

Troubleshooting: Flash Pattern 5 (N7 X;N8 X)

Diagnosing Flash Pattern 5 (Gas Valve)

Flowchart for diagnosing Flash Pattern 5 (Gas valve stuck open).

Troubleshooting: Flash Pattern 8 (N7 X;N8 X)

Diagnosing Flash Pattern 8 (Low DC Voltage)

Flowchart for diagnosing Flash Pattern 8 (Low DC input voltage).

Troubleshooting: Flash Pattern 9 (N7 X;N8 X)

Diagnosing Flash Pattern 9 (High DC Voltage)

Flowchart for diagnosing Flash Pattern 9 (High DC input voltage).

Troubleshooting: Flash Pattern 10 (N7 X;N8 X)

Diagnosing Flash Pattern 10 (Communication Loss)

Flowchart for diagnosing Flash Pattern 10 (Communication loss).

Troubleshooting: Thermistor Fault (N7 X;N8 X)

Diagnosing Thermistor Fault (N7 X;N8 X)

Flowchart for diagnosing thermistor faults, checking wiring and resistance.

Troubleshooting: Blank Display (N7 X;N8 X)

Diagnosing Blank Display Issue (N7 X;N8 X)

Flowchart for diagnosing a blank display, checking DC voltage, fuses, and wiring.

User Interface - N7 LX;N8 LX Models

N7 LX;N8 LX LCD Interface Layout

Fault Codes - N7 LX;N8 LX Models

N7 LX;N8 LX LCD Fault Code Reference

Table listing LCD fault codes, meanings, and recommended actions for N7LX/N8LX models.

Troubleshooting: no FL Alarm

Diagnosing no FL Alarm

Flowchart for diagnosing 'no FL' alarm, checking burner, gap, and gas train.

Troubleshooting: no AC Alarm

Diagnosing no AC Alarm

Flowchart for diagnosing 'no AC' alarm, checking AC input voltage and fuses.

Troubleshooting: AC HE Alarm

Diagnosing AC HE Alarm

Flowchart for diagnosing 'AC HE' alarm, checking AC heater wiring and resistance.

Troubleshooting: dc HE Alarm

Diagnosing dc HE Alarm (DC Heater)

Flowchart for diagnosing 'dc HE' alarm (DC heater fault).

Troubleshooting: AC rE Alarm

Diagnosing AC rE Alarm (AC Relay)

Flowchart for diagnosing 'AC rE' alarm (AC heater relay stuck).

Troubleshooting: dc rE Alarm

Diagnosing dc rE Alarm (DC Relay)

Flowchart for diagnosing 'dc rE' alarm (DC heater relay stuck).

Troubleshooting: Lo dc Faults

Diagnosing Low DC Voltage Faults

Flowcharts for diagnosing 'Lo dc' / 'Lo dC' (low DC voltage) faults.

Troubleshooting: HI dc Alarm

Diagnosing HI dc Alarm

Flowchart for diagnosing 'HI dc' (high DC voltage) fault.

Troubleshooting: no dt Alarm

Diagnosing no dt Alarm (Comm Loss)

Troubleshooting: Sr Alarm

Diagnosing Sr Alarm (Internal Control)

Troubleshooting: oP LI Alarm

Diagnosing oP LI Alarm (Limit Circuit)

Troubleshooting: “FL” “- -” Alarm

Diagnosing “FL” “- -” Alarm (Flame Sense)

Troubleshooting: Flashing Temperature Setting

Diagnosing Flashing Temp Setting (Thermistor)

Cooling System Diagnostic Flowchart

Initial Cooling Unit and Ventilation Check

Heat Input and Leveling Checks

Cooling System Diagnostics

Door Gasket and Leak Rechecks

Cooling Unit Performance Test

Remove; Replace Refrigerator

Refrigerator Removal and Replacement

Conduct Gas Leak Test

Norcold Polar N8X Specifications

General

Type	Absorption Refrigerator
Capacity	8 cu. ft.
AC Voltage	120V
DC Voltage	12V
Refrigerant	Ammonia
Power Source	AC, DC, LP Gas
Energy Consumption (AC)	3.0 kWh/day
Energy Consumption (LP Gas)	0.5 lbs per day
Color	Black