Dometic G6A-8E User Manual

HEATING
WATER HEATERS
Form No. 94840 01/20 | ©2020 Dometic Corporation
WARNING
Cancer and Reproductive Harm
www.P65Warnings.ca.gov
G6A-8E, GH6-8E, G10-3E, GH10-3E, WH-6GA, GC6AA-10E, GCH6A-10E, GC10A-4E,
GCH10A-4E, WH-6GEA, OD-5001, G6A-7, G10A-2, G9-EXT, G16-EXT,
GE9-EXT, GEH9-EXT, WH-9EXT, GE16-EXT, GEH16-EXT
EN
Water Heater
Service Manual ........................2

WARNING: BURN HAZARD, FIRE,
EXPLOSION, AND/OR CARBON MONOXIDE
HAZARD.
Keep the Water Heater area clear of combustible
cleaning materials, gasoline, and other flammable
vapors and liquids. Failure to obey this warning
could result in death or serious injury.
WARNING: If the information in this manual is not followed
exactly, a fire or explosion may result, causing property
damage, personal injury, or death.
– Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
– WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch.
• Do not use any phone in your recreational vehicle.
• Clear the recreational vehicle of all occupants.
• Turn off the gas supply tank valve(s) or main gas supply.
• Immediately call your gas supplier for instructions. If you
cannot reach your gas supplier, call the fire department.
– Have the gas system checked and leakage source corrected by
a qualified installer, service agency, manufacturer or dealer, or
the gas supplier.

Dometic G6A-8E Specifications

General

Brand	Dometic
Model	G6A-8E
Category	Water Heater
Language	English

Summary

Explanation of Symbols and Safety Instructions

Recognize Safety Information

Identifies safety alert symbols used to warn of hazards.

Understand Signal Words

Explains signal words indicating hazard severity and damage potential.

Supplemental Directives

Provides directives to reduce accident and injury risks during service.

General Safety Messages

Contains critical safety warnings, including carbon monoxide hazards.

Intended Use

Troubleshooting

Troubleshooting Table

Lists operational issues, potential causes, and diagnostic procedure pages.

General Information

Tools and Materials

Lists recommended tools and materials for appliance servicing.

Diagnostics Table

Cross-references components with diagnostic questions and actions.

Terminology

Defines terms used in the water heater service manual.

Model Identification

Explains how to interpret model numbers and identify water heater components.

Component Locations

Shows general locations of water heater components for various models.

Sequence of Operations

Details the operational flow for different water heater types for diagnosis.

Wiring Diagrams

Diagnostic Procedures

Component-Based Diagnostics

Guides identification of operational issues by diagnosing individual components.

Error-Based Diagnostics

Helps diagnose operational errors indicated by the wall switch fault light.

Installation Issues

Power Issues

Addresses problems caused by the RV power supply, not the heater itself.

Gas Pressure Issue

Explains how gas pressure affects water heater operation and troubleshooting.

Service Procedures

Accessing the Components

Provides steps to open the water heater access door for service.

Shutting Down the Water Heater

Outlines the procedure for safely shutting down the water heater.

Performing a Gas Leak Test

Details the safe method for checking for gas leaks.

Performing a Thermostat or E.C.O. Continuity Test

Explains how to test thermostat and E.C.O. continuity with a multimeter.

Replacing a Thermostat or E.C.O.

Step-by-step guide for replacing the thermostat or E.C.O. component.

Performing a Thermal Cut-Off Continuity Test

Describes how to test the continuity of the thermal cut-off.

Replacing a Thermal Cut-Off

Step-by-step instructions for replacing the thermal cut-off.

Performing an Ohms Test on the Gas Solenoid Valve Coils

Details how to test the resistance of gas solenoid valve coils.

Replacing the Gas Solenoid Valve

Provides instructions for replacing the gas solenoid valve.

Removing the Orifice for Cleaning

Guides the removal and cleaning of the gas orifice.

Performing an Ohms Test on the Heating Element

Explains how to test the resistance of the heating element.

Replacing the Heating Element

Step-by-step instructions for replacing the heating element.

Replacing a Control Board

Details the process for removing and installing a new control board.

Replacing the Relay

Step-by-step guide for replacing the relay component.

Replacing the Electrode

Provides instructions for removing and installing the electrode.

Adjusting the Electrode Gap

Explains how to properly adjust the gap of the electrode.

Re-establishing the Thermal Expansion Air Pocket

Guides on how to re-establish the thermal expansion air pocket.

Replacing the P/T Valve

Step-by-step instructions for replacing the pressure/temperature relief valve.

Confirming the Bypass Kit Placement

Instructions for verifying the correct placement of the bypass kit.

Performing a Wall Switch Continuity Test

Tests continuity of wall switches for gas and gas/electric models.

Replacing the Mixing Valve

Step-by-step guide for replacing the mixing valve on EXT models.

Bypassing the Pressure Switch

Instructions on how to bypass the pressure switch for testing.

Performing a Pressure Switch Continuity Test

Tests continuity of the pressure switch on On Demand models.

Replacing the Pressure Switch

Step-by-step instructions for replacing the pressure switch.

Tightening the Cold-Weather Thermostat Set Screw

Guides on adjusting the set screw for the cold-weather thermostat.

Performing a Cold-Weather Thermostat Continuity Test

Tests continuity of the cold-weather thermostat.

Replacing the Cold-Weather Thermostat

Step-by-step instructions for replacing the cold-weather thermostat.

Adjusting the Winter/Summer Setting

Instructions for adjusting the winter/summer setting on the modulating valve.

Replacing the Modulating Valve

Step-by-step guide for replacing the modulating valve.

Performing a Reed Switch Continuity Test

Tests continuity of the reed switch on On Demand models.

Performing a Thermocouple Circuit Test

Tests the continuity of the thermocouple circuit for pilot models.

Testing the Thermocouple

Explains how to test the millivoltage output of the thermocouple.

Replacing the Thermocouple

Step-by-step instructions for replacing the thermocouple on pilot models.

Maintenance

Cleaning the Mixing Valve Screen

Guides on cleaning the mixing valve screen for EXT models.

Flushing the Tank

Procedure for general flushing of the water heater tank.

Cleaning the Pressure Switch Hose, Nipples, and Straw

Instructions for cleaning pressure switch components.

Checking the DSI Control Board

Guidance on checking the DSI control board and its fuse.

Inspecting the Burner and Burner Assembly

Checks for proper function, alignment, and obstructions of the burner.

Understanding P/T Valve Weeping

Explains normal weeping of the P/T relief valve.

Resetting a Locked-Out Control

Steps to reset a locked-out control for gas/electric models.

Disposal

Replacement Parts