ARP Fridge Defend Troubleshoot Manual

Fridge Defend® by ARP
Condenser
Absorber Coil
LIQUID : Water;
Ammonia; Sodium
Chromate
Refrigerated Space
Boiler Assembly
Q2
Q3
Q1
Evaporator
Cooling
Fin
Boiler
Percolator
Pump
Q1 =Q2 +Q3
v5.x ARP & ARP + Fan Control
Troubleshooting Guide
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ARP Fridge Defend Specifications

General

Category	Automobile Accessories
Features	reverse polarity protection
Operating Temperature	-40°C to +85°C
Protection Features	reverse polarity protection
Purpose	Protects RV refrigerators from damaging power surges and voltage fluctuations

Summary

Safety Information

Setup Mode Operations

Activating and Navigating Setup Mode

Details how to enter setup mode and operate control buttons for configuration.

Diagnostic Readings in Setup Mode

ARP Error Messages

Error Message Categories

Explains error types (operational, startup) and specific error indicators.

Common Boiler Sensor Errors

Details errors related to boiler sensor issues like OPn, SHt, and -LO.

Temperature and System Status Errors

Covers errors like *O*F*8, *H*O*8, and bAd indicating system status.

MCU and Relay Errors

Memory and Data Integrity Errors

MCU Test Errors

ARP Reset Procedure

Provides steps to reset the ARP control to factory default settings.

Introduction to Fridge Repair

Diagnostic Variables

Understanding Diagnostic Variables

Electrical Short Troubleshooting

Provides guidance for troubleshooting repeated SHt errors and shorts.

Control Variables

No Set-Point Mode (SP0)

Testing Fridge Voltage

Auto Tune Mode

Auto Tune Procedure

Step-by-step guide for running the Auto Tune function for fridge calibration.

RTD Troubleshooting

Checking the Boiler Sensor

Instructions for testing the boiler sensor resistance and wiring.

Troubleshooting SHt Errors

Explains common causes of SHt errors and how to resolve them.