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Water Heater Troubleshooting
3 Troubleshooting
This section has tables showing the main causes for
Water Heater issues.
Review the “Troubleshooting Table” on page 5
to help you identify the suspected operational issue,
the potential causes, and the diagnostic procedure
associated with those issues.
Refer to the “Diagnostics Table” on page 8 for links
to specific component diagnostic tasks intended to
help you confirm the suspected operational issue and
potential cause.
Remember to check the basics, including contributing
issues, before replacing any parts. Refer to “Installation
Issues” on page 29 and “Maintenance” on page 48
for more detail.
Troubleshooting Table
Operational Issue Potential Reason Page
Gas Only and Gas/Electric Combination Water Heaters (Standard and EXT)
The gas solenoid valve opens, but there is no
spark.
There is no voltage going out from the ignitor on the control board. 20
The electrode has shorted out. 22
The gas solenoid valve opens and there is a
spark, but there is no ignition.
The gas pressure is too low or absent. 29
The orifice is blocked. 25
The electrode has shorted out. 22
The burner tube is blocked. 20
The burner tube is misaligned.
The air shutter requires adjustment.
The flame spreader is misaligned.
The gas solenoid valve is defective. 23
The gas solenoid valve fails to open and there
is no spark.
The wall switch is defective. 28
The wall switch is wired incorrectly.
The DC voltage is too low or absent. 29
The E.C.O. is in open circuit. 22
The thermostat is in open circuit. 27
The thermal cut-off is in open circuit. 26
The control board is defective. 20
The 2 A fuse on the control board is blown.
The electrode has shorted out. 22
The gas solenoid valve fails to open, but there
is a spark.
There is no power going out to the gas solenoid valve from the
control board.
20
The gas solenoid valve is defective. 23
The voltage is less than 10.5 DC Volts. 23
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