8
EN
General Information Water Heater
Operational Issue Potential Reason Page
The pilot fails to light. The gas pressure is too low or absent. 29
The pilot gas line is blocked. 25
The pilot orifice is blocked.
The gas valve is defective. 23
The main burner has an erratic flame or fails to
light.
The burner tube is blocked. 20
The burner tube is misaligned.
The main burner orifice is blocked.
The flame spreader is misaligned.
The air shutter requires adjustment.
The gas valve is defective. 23
Diagnostics Table
Component Page
Burner Assembly 20
Control Board (Standard and EXT) 20
E.C.O. 22
Electrode 22
Gas Solenoid Valve 23
Heating Element 24
Mixing Valve 24
Modulating Valve 24
Orifice 25
P/T Relief Valve 25
Pilot Assembly 25
Pressure Switch 25
Relays 26
Tank 26
Thermal Cut-Off 26
Thermocouple (Gas Only - Pilot Model Only) 26
Thermostat (Cold-Weather) 27
Thermostat (Standard) 27
Wall Switch 28
Winter/Summer Setting Screw 28
4 General Information
This section provides reference information on the
tooling, terminology, model identification, and
components associated with the different models.
I
The images used in this document are for reference
purposes only. Components and component
locations may vary according to specific product
models. Measurements may vary ±0.38 in. (10 mm).
4.1 Tools and Materials
Dometic recommends that the following tools and
materials be used while servicing the appliance:
Recommended Tools
Common Hand Tools Wire Strippers/Crimpers
U-Tube Manometer Jumper Wire
Water Heater Board Tester Leak Test Solution
Multi-Meter - DC/AC
Voltage, Ohms Resistance,
DC Millivolts
Substance Temperature
Thermometer
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