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7
Potential Installation Issues
Symptom Cause Solution
Temperature set to 60 ºF and not
adjustable
Vacation mode is on Turn off Vacation mode by pressing
the Vacation button
Electric mode selected but the
heat pump is running
Upon initial start up, the heat
pump will run until the tank
temperature reaches the set
point; this is done so that the
heat pump operation can be
verified. The water heater
will operate according to the
selected mode after this first
run.
No action is necessary.
If after heat pump operation has
been verified and element heating
is desired, lower the set point
temperature to 95ºF. The heat
pump will shut off when the tank
temperature is ≥ 95º F. Set the
temperature to the desired set point.
The elements will now be used for
heating in Hybrid and Electric modes.
Power is applied to the unit, but
there is no display on the User
Interface Module (UIM)
The unit is in Standby; the
power button on the UIM is
RED
Press the power button; it should turn
green and the display should light
up. If the power button does not turn
green, remove the protective film
over the face of the UIM and re-try
the power button.
If the unit does not power up, cycle
power to the unit and re-try using a
thumb.
“Low Water Level Alarm” message
displayed on the UIM
The tank is not completely
filled with water
Purge air from the tank using the
procedure outlined in the “Dry Fire
Element Protection” section (p.8).
If the tank is properly filled, the unit
should operate normally.
“Heat Pump Fault” message
displayed on the UIM
There are 12 potential causes
for this fault
Refer to the Trouble Shooting section
for corrective actions (p.39-44)
Efficiency mode selected but
elements come on instead of heat
pump
Ambient air or water
temperature outside the heat
pump safe operating envelope
Heat pump safety lock out occurs if :
• ambient air temperature is
below 45º F or above 109º F;
• tank temperature is below 59º F