Table of Contents
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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
Water Heater
EN
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
Cancer and Reproductive Harm
www.P65Warnings.ca.gov
HEATING
WATER HEATERS
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.
Form No. 94840 01/20 | ©2020 Dometic Corporation
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Table of Contents
Related Manuals for Dometic G6A-8E
Summary of Contents for Dometic G6A-8E
- Page 1 HEATING WATER HEATERS 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 Water Heater Service Manual ......2...
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Page 2: Table Of Contents
Service Center & Dealer Locations Service Center & Dealer Locations Replacing a Thermal Cut-Off ... . .34 Visit: www.dometic.com Visit: www.dometic.com Performing an Ohms Test on the Gas Solenoid Valve Coils ....35 Read these instructions carefully. - Page 3 Water Heater Water Heater Explanation of Symbols and Safety Instructions Explanation of Symbols and Safety Instructions 1.3 Supplemental Directives Cleaning the Pressure Switch Hose, Nipples, and Straw ....49 To reduce the risk of accidents and injuries, please Checking the DSI Control Board .
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Page 4: Intended Use
Failure to obey this warning can • Dometic gas-operated products are for use with result in death or serious injury. liquid propane (LP) gas only in recreational vehicles only, such as travel trailers, motor homes, and tent campers. -
Page 5: Troubleshooting
Water Heater Troubleshooting 3 Troubleshooting Refer to the “Diagnostics Table” on page 8 for links to specific component diagnostic tasks intended to This section has tables showing the main causes for help you confirm the suspected operational issue and Water Heater issues. potential cause. - Page 6 Troubleshooting Water Heater Operational Issue Potential Reason Page The burner will not ignite, has an erratic The air shutter requires adjustment. burner flame, or is sooting. The burner tube is blocked. The burner tube is misaligned. The flame spreader is misaligned. The orifice is blocked.
- Page 7 Water Heater Troubleshooting Operational Issue Potential Reason Page On Demand Water Heaters When the water is running, the appliance The water flow is less than 0.8 gpm (3.0 lpm) at the faucet. does not attempt ignition and the fan does The winter/summer setting on the modulating valve requires not run.
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Page 8: General Information
Measurements may vary ±0.38 in. (10 mm). Heating Element Mixing Valve 4.1 Tools and Materials Modulating Valve Orifice Dometic recommends that the following tools and materials be used while servicing the appliance: P/T Relief Valve Pilot Assembly Recommended Tools Pressure Switch... -
Page 9: Terminology
Do not Anode Rod use an anode rod in a Dometic Water A control that supplies 12 VDC to the Heater. Use of an anode rod voids the Water Heater when in the On position On/Off Switch warranty. -
Page 10: Model Identification
SPEC # MANIFOLD PRESSURE GAL/HR MAXIMUM WORKING PRESSURE 150 PSI. TEST PRESSURE 300 PSI. MFG BY DOMETIC CORPORATION POUR LE SAZ PROPANE SEULEMENT. SUITABLE FOR WATER (PORTABLE) HEATING ONLY. GREENBRIER, IN 37073 USA FOR USE WITH LP GAS ONLY. 0606 / MPD 91818 DESIGN COPMLIES WITH ANSI Z21.10.1-2014/ CSA 4.1-2014... -
Page 11: Component Locations
Water Heater General Information 4.4 Component Locations Model Identification Examples for Electronic Exothermal Technology (EXT) Models This section shows the general component locations for the Water Heater models. Actual model component 16 EXT locations may vary. EXT Status* Effective Capacity Element Type Fuel Type Fuel Type... -
Page 12: E.c.o
General Information Water Heater Gas/Electric Combination (Standard and EXT) Component Locations On Demand - Gas Component Locations P/T Relief Valve Air Shutter E.C.O. Control Board Control Board Electrode Cold-Weather Kit Pressure Switch Elbow E.C.O./Thermostat Burner Tube Heat Exchanger Relay Gas Valve Drain Plug Gas Valve Assembly Modulating Valve... -
Page 13: Sequence Of Operations
Water Heater General Information 4.5 Sequence of Operations Gas Sequence of Operation for Gas/Electric Combination Models Understanding the sequence of operations for a Water 6. With the wall switch turned On for gas, 12 VDC power Heater is an important part of diagnosing the operational is sent out of the switch and into the orange wire on issues occurring in the Water Heater. - Page 14 General Information Water Heater 1. With the wall switch turned On, 12 VDC power is 1. With the wall switch turned On, 12 VDC power is sent out of the switch and into the red wire on the sent out of the switch and into the brown wire on the wire harness.
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Page 15: Wiring Diagrams
Water Heater Wiring Diagrams 5 Wiring Diagrams This section provides examples of the wiring specifications for the various Water Heater models. Gas Only Models Thermal Cut-Off Fixed Temp. Thermostat Remote Wall Switch +12 VDC Brown Blue Control Board E.C.O. Switch Green Gas Solenoid Remote Lock-Out Lamp... - Page 16 Wiring Diagrams Water Heater Black/Brown Yellow Yellow DNG Chuan Relay Zettler Relay Green Green Black Black Black/Brown Gas/Electric Combination Relays Wiring Diagram On Demand Models Blue Gas Valve Lockout Lamp (optional) Purple Pressure Switch PROX Brown Green Freeze Ign. Cont Fuse E.C.O.
- Page 17 Water Heater Wiring Diagrams Other Models Junction Box on back of unit Battery White Ground Brown Blue White Non-ignition Light Control Board Orange Remote Switch Valve White Sparker Water Heater Wiring Schematics: G6A-2E, G6A-3E, GH6-4E, GH6-3E (Rear Mount E.C.O. and Thermostat Models) Battery Brown Blue...
- Page 18 Thermal Cut-Off Switch Brown Brown Fixed Temp. Control Thermostat Green Green Green Spark & Sense Water Heater Wiring Schematics: G6A-7E, GH6-7E, GC6A- 7E, GCH6-7E, GC6AA-7E, G6A-8E, GH6-8E, GC6AA-8E, GCH6AA-8E, GCH6A-9E Switch Hot Lead Black Black Fixed Thermostat Ground Lead Green...
- Page 19 Water Heater Wiring Diagrams Switch Wiring Fault Light (from Water Heater) Ground (from Water Heater) +12 VDC (from RV) Gas (from Water Heater) Gas Only/Single Wall Switch Wiring Fault Light +12 VDC Jumper Wire Battery Ground (from Water Heater) Dual Connection for DC Power In to Switch and Jumper over to gas side Ground Electric...
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Page 20: Diagnostic Procedures
Dometic wall switch. Remember to check the basics before replacing Refer to “Component-Based Diagnostics” on page 20 any parts, such as contributing issues. Refer to the and “Error-Based Diagnostics”... - Page 21 Water Heater Diagnostic Procedures Component Diagnostic Question Action Based On Status Page Control Board (Standard and EXT) Continued GAS ONLY BOARDS Check for power on the brown wire. If there is no power on the brown wire, the problem is not with the board.
- Page 22 Diagnostic Procedures Water Heater Component Diagnostic Question Action Based On Status Page Control Board (Standard and EXT) Continued • Confirm that the E.C.O. is not an open circuit. • Confirm that the gas solenoid valve has resistance. If all of the checks are confirmed, replace the control board.
- Page 23 Water Heater Diagnostic Procedures Component Diagnostic Question Action Based On Status Page Electrode (Continued) • Inspect the electrode for visible damage or a crack in the ceramic. If the electrode is arcing outside of the tip of the spark probe or there is visible damage or cracks in the ceramic, the electrode has shorted out.
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Page 24: Heating Element
Diagnostic Procedures Water Heater Component Diagnostic Question Action Based On Status Page Heating Element (Gas/Electric Combination models) Does the gas/electric combination Perform the following checks: model operate using gas but does not Check the voltage. If the heating element has operate on electric power? 110 VAC but is not getting hot, replace the heating element. -
Page 25: Orifice
Water Heater Diagnostic Procedures Component Diagnostic Question Action Based On Status Page Orifice Does the gas solenoid valve open when Check the orifice for blockages. there is a spark, but there is no ignition? If blockages are present, clean the orifice. Does the burner fail to ignite, have an erratic burner flame, or is sooting? P/T Relief Valve... -
Page 26: Relays
Diagnostic Procedures Water Heater Component Diagnostic Question Action Based On Status Page Relay (Gas/Electric Combination Model) Does the gas/electric combination Perform the following checks: model operate using gas but does not Determine if power is going out to the relay operate on electric power? from the control board on the yellow wire. -
Page 27: Thermostat (Cold-Weather)
Water Heater Diagnostic Procedures Component Diagnostic Question Action Based On Status Page Thermostat (Cold-Weather) (On Demand Models) Does the E.C.O. trip repeatedly? Confirm the cold-weather thermostat is seated tightly to the heat exchanger. If the cold- weather thermostat is not touching the heat exchanger, it will kick on but not kick back off when the ambient temperature drops below 40 °F (4.5°C) and eventually it will trip the... -
Page 28: Error-Based Diagnostics
(44 °C–46 °C)]? temperature is reached. 6.2 Error-Based Diagnostics The Dometic wall switch has a red LED fault light that is energized by sending DC voltage from the blue wire on the control board. The red light illuminates to indicate an identified operational error. Refer to the following table to diagnose system errors based on the Water Heater model. -
Page 29: Installation Issues
Water Heater Installation Issues Model Fault Description Possible Cause Recommended Action Page Gas Only or The Water Heater failed to light There are many possible causes for Refer to the troubleshooting Gas/Electric after three ignition attempts. a unit not to light. section. - Page 30 Service Procedures Water Heater • Gas appliances must not be operated while the WARNING: BURN HAZARD, FIRE, vehicle is in motion. Unpredictable wind currents may EXPLOSION, AND/OR CARBON MONOXIDE be created which could cause flame reversal in the HAZARD. Failure to obey the following burner tube, which could result in fire damage.
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Page 31: Accessing The Components
Water Heater Service Procedures 8.1 Accessing the Components WARNING: ELECTRICAL GROUNDING HAZARD. When an appliance is equipped with a three- prong (grounding) plug for your protection against shock hazards, it should be plugged directly into a properly grounded three-prong receptacle. Do not cut or remove the grounding prong from this plug. -
Page 32: Shutting Down The Water Heater
Service Procedures Water Heater 8.2 Shutting Down the Water Heater 2. Locate the component for testing. See “Component Locations” on page 11. 3. Place a non-corrosive leak detection fluid into a spray bottle. 4. Lightly spray the component with the fluid. 5. -
Page 33: Replacing A Thermostat Or E.c.o
Water Heater Service Procedures 4. The readings should confirm continuity/closed 5. Rotate the existing thermostat or E.C.O. to align the circuit at Water Heater temperatures below 140 °F notch with the tab that is not bent outward. (60 °C) ±10 °F (±6 °C) for a thermostat or below 6. -
Page 34: Replacing A Thermal Cut-Off
Service Procedures Water Heater 3. Attach the leads of the multi-meter, one to each end 3. Unplug the thermal cut-off from the thermostat. of the thermal cut-off. 4. Disconnect the brown wire. 4. The reading should confirm continuity/closed 5. Reverse steps 3–4 to install the new thermal cut-off circuit. -
Page 35: Performing An Ohms Test On The Gas Solenoid Valve Coils
Water Heater Service Procedures 8.8 Performing an Ohms Test on the 8.9 Replacing the Gas Solenoid Gas Solenoid Valve Coils Valve Gas Only or Gas/Electric Combination (Standard Gas Only or Gas/Electric Combination (Standard and EXT) Models Only and EXT) Models Only Testing the Gas Solenoid Valve Coils 1. -
Page 36: Removing The Orifice For Cleaning
Service Procedures Water Heater 8.10 Removing the Orifice for 8.11 Performing an Ohms Test on the Cleaning Heating Element Gas Only or Gas/Electric Combination (Standard Gas/Electric Combination (Standard and EXT) and EXT) Models Only Models Only Removing the Orifice for Cleaning 1. -
Page 37: Replacing The Heating Element
Water Heater Service Procedures 8.12 Replacing the Heating Element Bolt-in elements are used on older models. All current and new models use screw-in elements. Gas/Electric Combination (Standard and EXT) 8. Remove the heating element: Models Only – Screw-in model: turn the heating element to unscrew and pull the element out. -
Page 38: Replacing The Relay
Service Procedures Water Heater 8.15 Replacing the Electrode Make sure that the electrode wire is pushed tightly onto the ignitor on the control board and the cover Gas Only or Gas/Electric Combination (Standard is placed back over the connection. and EXT) Models Only 8.14 Replacing the Relay Gas/Electric Combination (Standard and EXT) Models Only... -
Page 39: Adjusting The Electrode Gap
Water Heater Service Procedures 8.16 Adjusting the Electrode Gap 8.17 Re-establishing the Thermal Expansion Air Pocket Gas Only or Gas/Electric Combination (Standard and EXT) Models Only Gas Only or Gas/Electric Combination (Standard and EXT) Models Only Adjusting the Electrode Gap Gap: 1/8 in. -
Page 40: Replacing The P/T Valve
Service Procedures Water Heater 8.18 Replacing the P/T Valve 8. Perform the steps in “Re-establishing the Thermal Expansion Air Pocket” on page 39. Gas Only or Gas/Electric Combination (Standard and EXT) Models Only 8.19 Confirming the Bypass Kit Placement Gas Only or Gas/Electric Combination (Standard and EXT) Models Only Replacing the PT Valve Confirming the Bypass Kit Placement... -
Page 41: Performing A Wall Switch Continuity Test
Water Heater Service Procedures 8.20 Performing a Wall Switch 8.20.2 Gas/Electric Combination (Standard and EXT) Models Continuity Test Use one of the following procedures to test continuity as determined by the Water Heater model being serviced. 8.20.1 Gas Only (Standard and EXT) Models Gas/Electric Combination (Standard and EXT) Models 1. -
Page 42: Replacing The Mixing Valve
Service Procedures Water Heater 4. Unscrew and remove the external drain plug to drain the water out of the Water Heater. 5. Unscrew and remove the mixing valve hose from the incoming water line connection. 6. Unscrew and remove the hot-water hose from the mixing valve. -
Page 43: Performing A Pressure Switch
Water Heater Service Procedures 8.23 Performing a Pressure Switch 8.24 Replacing the Pressure Switch Continuity Test On Demand Models Only On Demand Models Only Replacing the Pressure Switch Performing a Pressure Switch Continuity Test Pressure Switch Pressure Straw 1. Place the control switch in the Off position. Pressure Hose 2. -
Page 44: Tightening The Cold-Weather
Service Procedures Water Heater 8.25 Tightening the Cold-Weather When the ambient temperature is below approximately 40 °F (4.5 °C) you should have Thermostat Set Screw continuity across the two leads of the cold-weather thermostat. On Demand Models Only Consult the operating manual for your multi-meter for specific device function. -
Page 45: Adjusting The Winter/Summer Setting
Water Heater Service Procedures 8.28 Adjusting the Winter/Summer Setting On Demand Models Only Disconnecting the Water Heater Gas Connection Wiring Harness Cold Water Inlet Rubber Grommet 8. Disconnect the cold-water inlet hose and remove the Adjusting the Winter/Summer Setting fitting. 8.29 Replacing the Modulating 9. -
Page 46: Performing A Reed Switch
Service Procedures Water Heater 8.30 Performing a Reed Switch 15. Remove the two mounting screws at the bottom of the Water Heater casing that secure the modulating Continuity Test valve to the Water Heater. On Demand Models Only Disconnecting the Heat Exchange, P/T Valve, and Gas Line Heat Exchange Gas Line P/T Relief Valve... -
Page 47: Performing A Thermocouple Circuit Test
Water Heater Service Procedures 3. Set your multi-meter to the Ohms resistance setting. 4. Attach one lead of the multi-meter into the center of the thermocouple port. Be sure to center the lead to the thermocouple port. Touching the sides will create a false reading. 5. -
Page 48: Replacing The Thermocouple
HAZARD. Failure to obey the following warnings could result in death or serious injury. • Use only Dometic replacement parts and components, which are specifically approved for use with the appliance. • Do not use matches, candles, or other sources of ignition to test fittings and gas lines for leaks. -
Page 49: Flushing The Tank
Water Heater Maintenance 9.4 Checking the DSI Control Board 4. Soak the mixing valve in a hot white vinegar bath and flush out the tank. The Water Heater comes factory-equipped with a 2 A 5. Reinstall the mixing valve screen and valve. fuse on the DSI control board to protect from wiring shorts. -
Page 50: Understanding P/T Valve Weeping
Consult a local recycling center or specialist dealer for details about how to dispose of the product in accordance with all applicable national and local regulations. 11 Replacement Parts For the most current parts information, visit www. dometic.com. - Page 51 Water Heater...
- Page 52 Mobile living made easy. dometic.com YOUR LOCAL YOUR LOCAL YOUR LOCAL DEALER SUPPORT SALES OFFICE dometic.com/dealer dometic.com/contact dometic.com/sales-offices...