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TROUBLESHOOTING
WARNING! Working near an energized
circuit can result in severe injury or death
from electrical shock.
WARNING! When you are finished, be
sure all covers are secured to reduce the
risk of fire and electric shock.
Troubleshooting & Main-
tenance:
If you are not qualified or are not
comfortable performing any of the
troubleshooting, repair or maintenance
procedures that follow, Call our Technical
Assistance Hotline at 1-800-527-1953 for
further assistance.
No Hot Water
The most likely reasons for an electric
water heater to produce NO hot water are:
• No power to the water heater (No lights
on the unit are on).
• Unit in Vacation Mode.
• ECO tripped.
• Hot water usage pattern exceeds the
capability of the water heater in current
mode.
• Non-functioning upper temperature
sensor.
• Faulty thermostatic mixing valve.
• Leak in plumbing system.
Follow these steps to diagnose and correct
common electrical problems:
Check the electrical power to the
1
water heater. No hot water is
often caused by a problem with
the homes electrical wiring or circuit
breakers. You'll need a non-contact circuit
tester. Follow these guidlines:
• Locate the water heater's circuit
breaker and turn it off (or remove the
circuit's disconnects).
22 • Residential Hybrid Electric Heat Pump Water Heater Use and Care Guide
• Locate the electrical junction box
on the side of the water heater and
remove the cover.
• Identify the two power wires. The
power wires are usually black/black or
black/red-the green or copper wire is
the ground wire.
Figure 28 - Use a non-contact circuit tester
to check for electrical power.
• Turn the circuit breaker back on (or
install the disconnects) 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 junction box.
If the water heater is not getting power,
contact a qualified person to have your
homes wiring or circuit breakers checked.
Check the upper heating
2
element. If the water heater is
getting electrical power, check to
see if the upper heating element is burned
out. If the upper element is burned out,
you'll have no hot water. To check the
upper element, you'll need a multimeter
capable of reading resistance.
• Turn the power OFF at the circuit
breaker or remove disconnects.
• Remove the upper access panel.
• Move the insulation to the side to
access the ECO and heating element.
Check the top two screws of the
3
ECO using a non-contact circuit
tester and confirm that power is
off (screw terminals 1 and 3 in photo on
next page).
• WIth the electrical power off, remove
the two power wires from the upper
heating element.
Figure 29 - Use a multi meter to check the
resistance of the upper heating element.
Check the resistance of the
4
upper heating element using a
multimeter. Measure the
resistance between the two screw
terminals on the upper heating element. A
good element will have a resistance
ranging between 5 and 25 Ohms. If the
resistance is:
Outside this range. Replace the element
(see Replacing the Heating Element sec-
tion on page 27). If the lower element is
a concern, repeat the element check pro-
cedure for the lower element. The upper
and lower elements should have the same
resistance range.
Within this range. Reattach the power
wires, making sure the wires are in good
condition and the connections are clean
and tight. Next check the following: ECO,
on next page.
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Troubleshooting
