Loading ...
Loading ...
Loading ...
22 • Residen al Electronic Thermostat Electric Water Heater Use and Care Guide
TROUBLESHOOTING
WARNING! Working near an
energized circuit can result in severe
injury or death from electrical shock.
WARNING! When you are fi nished,
be sure all covers are secured to reduce
the risk of fi re and electric shock.
Limp Mode
The heater will con nue opera ng with
one failed hea ng element by switching
into Limp Mode. Example:
• If the control module determines that
the lower thermistor or lower element
has failed, the lower element call
for heat will be canceled. The upper
element call for heat will s ll allow the
upper element to heat the water as
needed.
• If the control module determines that
the upper thermistor or upper element
has failed, the lower element will be
allowed to heat the water as needed.
NOTICE: The control assembly will
operate in Limp Mode un l the failure is
corrected.
No Hot Water
The most likely reasons for an electric
water heater to produce NO hot water
are:
• No electric power—a common
problem with new installa ons
• Burned out upper and lower element
• Tripped Energy Cut Off (red bu on
on electronic thermostat)
• The water heater’s inlet and outlet
connec ons are reversed (usually
only in new installa ons)
• Broken electronic thermostat (or wiring)
• A leak in the hot water side of the
plumbing system that exceeds the
water heater’s hea ng capacity and
makes it appear that the water heater
is producing li le to no hot water
Follow these steps to diagnose and
correct common electrical problems:
1
Check the electric power to
the water heater. No hot
water is o en caused by a
problem with the home’s electrical
wiring or circuit breakers. You’ll need a
non-contact circuit tester. Follow these
guidelines:
• Locate the water heater’s circuit
breaker and turn it off (or remove the
circuit’s fuses).
• Locate the electrical junc on box on
top of the water heater and remove
the cover.
• Iden fy the two power wires. The
power wires are connected to the
black/red wires from the water
heater—the green or copper wire is
the ground wire.
• Turn the circuit breaker back on
(or install the fuses) and check the
power on both incoming power wires
using a non-contact circuit tester.
• Turn the power off and replace the
cover on the electrical junc on box.
If the water heater is not ge ng
power, contact a qualifi ed person to
have your home’s wiring or circuit
breakers checked.
2
Check/Reset Energy Cut Off
(ECO) Bu on.
The Energy Cut Off (ECO) shuts off
power to the water heater’s elements
if the temperature of the water in
the tank gets too hot. If the ECO has
tripped, you’ll have no hot water. A
tripped ECO can usually be reset, but
you should have a qualifi ed person
inves gate the cause of the overheat-
ing and repair the problem. Do not
turn the power back on un l the cause
of the overhea ng has been iden fi ed
and repaired.
To check the Energy Cut Off (ECO)
• Turn off the power to the water
heater.
WARNING! Working near an
energized circuit can result in severe
injury or death from electrical shock.
Check power wires in the electrical
junc on box with a non-contact circuit
tester to make sure power is off .
• Press the red ECO reset bu on. See
Figure 26.
Reset
Button
Figure 26 - Emergency Cut Off (ECO) Button
• The ECO was tripped if you hear a
click when it is reset. In most cases,
a tripped ECO indicates that the
tank overheated due to a problem
with one of the elements or thermo-
stats—have a qualifi ed person check
the upper/lower elements and up-
per/lower thermostats. Replace any
of the components if necessary.
• The ECO was not tripped if you didn’t
hear a click. In that case, the thermo-
stats should be checked by a quali-
fi ed person.
• Replace the insula on the control as-
sembly and lower access panels
WARNING! Be sure all covers are
secured to reduce the risk of fi re and
electric shock.
TROUBLESHOOTING
Loading ...
Loading ...
Loading ...