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21
Accessing the Maintenance Display
The User Interface Module on the front of the heat
pump water heater has a multi-function display that
gives information about the status and condition of the
operation of the water heater. In power saving mode,
the display will be off; momentarily touching any of the
buttons above or below the display area will ‘wake’ the
display and cause it to light up. The User Display is
the default screen viewable during normal operation.
A second display mode is available, Maintenance
Display, which provides more detail about how the
water heater is operating and stores and displays
more specific fault messages.
Accessing the Maintenance Display
1. Touch and hold the Up and Down arrows at the
same time for three (3) seconds. The display will
change to the Maintenance Display mode.
2. A total of ten (10) screens are available in this
mode (see Table 2). By using the up arrow to
scroll, each screen is available for viewing. The
fi rst six (6) screens display system temperatures
and the fi nal four (4) show the fault code history.
The down arrow can be used to access previous
screens.
Table 2: Maintenance Display
Screen Message Meaning
1 ---- Ambient Temperature Air temperature entering evaporator
2 ---- Average Tank Temperature Weighted average of UT and LT
3 ---- Upper Tank Temperature Thermisitor, outer tank wall
4 ---- Lower Tank Temperature Thermisitor, outer tank wall
5 ---- Discharge Temperature Measured at compressor
6 ---- Coil Temperature Measured at evaproator
7 E01 Fault Code Newest (active) fault code
8 E02 Fault Code Historical Fault
9 E03 Fault Code Historical Fault
10 E04 Fault Code Historical fault
Interpreting the fault code history
Fault code E01 is the newest code detected. If there
is a fault shown on the User Display, E01 is the active
fault. Faults E02 through E04 are faults that have
been detected in the past and may or may not be
relevant. If one of these faults is the same as E01, it
is an indication that the fault is repeating. If there are
multiple operational issues, codes E01-E04 will be
helpful in troubleshooting efforts. The fault history can
not be cleared or reset. There will always be codes
stored whether there is an actual fault or not.