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EN
Diagnostic Procedures Water Heater
Component Diagnostic Question Action Based On Status Page
Thermostat (Standard) Continued
Is there excessive weeping coming from
the pressure/temperature (P/T) relief
valve?
The thermostat may be out of calibration.
Check to see if the water is getting too hot.
26
Confirm that the thermostat is seated on the
tank properly and is tight to the water tank.
11
Some weeping or dripping occurs as the
water heats up, this is normal operation.
Check the P/T relief valve.
25
Wall Switch
Gas/Electric Combination
Wall Switch
The gas solenoid valve fails to open and
there is no spark.
Does the gas/electric combination
model operate using gas but does not
operate on electric power?
Is the gas/electric combination model
not operating while using either gas or
electric power?
The wall switch may be defective or wired
incorrectly. Perform a continuity test.
41
Gas Only Wall Switch
On Demand Model: When the water
is running, does the appliance fail to
attempt ignition and the fan fail to run?
The wall switch may be defective or wired
incorrectly. Perform a continuity test.
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Winter/Summer Setting Screw (On Demand Models)
When the water is running, does the
appliance fail to attempt ignition and the
fan fail to run?
Does the E.C.O keep tripping?
Is the water temperature at the faucet too
hot [above or below 110 °F–115 °F
(43.3 °C–46.1 °C)]?
Is the water temperature at the faucet too
cold [below 110°F–115°F
(44°C–46°C)]?
When the water temperature is above or below
110°F–115°F (44°C–46°C), the winter/
summer setting screw may need adjustment.
• Set the screw at the default 12 o’clock
setting.
• If the water is too hot, turn the screw in small
increments to the right (clockwise) until the
desired water temperature is reached.
• If the water is too cold, turn the screw in
small increments to the le
(counter-clockwise) until the desired water
temperature is reached.
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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.
Model Fault Description Possible Cause Recommended Action Page
Gas/Electric
Combination
The E.C.O. is in open circuit or
becomes an open circuit during
the heating cycle.
The E.C.O. or thermostat is
defective.
Test and diagnose the E.C.O. 22
The gas solenoid valve has no
resistance.
The gas solenoid valve is
defective.
Test and diagnose the gas
solenoid valve.
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