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21. Troubleshooting
Symptom
Display is blank
In ECO+ mode, the
charge does not
start, the display is
always showing
Waiting for Surplus
and the export
power is 0W
In ECO+ mode, the
charge does not
start, the display is
always showing
Waiting for Surplus,
yet the export power
is showing correctly
Generation power is
always 0kW
Installation Limit !
displayed
Display will show the
phase(s) that is(are)
overloaded and the
prospective current
that would be drawn
if the zappi were
allowed to start
charge at the
minimum current
Installation Limit !
CT displayed
Cause
There is no power to the
•
unit
Grid Sensor incorrectly
•
installed
Faulty Grid Sensor
•
No signal from harvi (if
•
used)
Export Margin set too
•
high
Generation CT not
•
installed
The measured Grid
•
Current is greater than
the Grid Limit set in the
zappi
The Grid CT has become
•
disconnected or is not
Solution
Check for correct supply voltage at the
•
supply screw terminals (220 - 260V
AC)
Check the grid sensor is connected to a
•
CT terminal in the zappi or any CT
input in the harvi
Check the Grid CT sensor is installed on
•
the correct cable
Check resistance of the sensor - it
•
should be around 200Ώ when not
connected (remove the sensor from
the cable before testing resistance)
If using harvi, check that the CT input
•
has been set to Grid in the harvi
settings (under Linked Devices /
Devices
in
the
Settings menu)
Check Export Margin setting (default is
•
0W)
Install generation sensor and connect
•
to one of the CT inputs
Alternatively, if there is no Generation
•
CT,
the
Generation
consumption figures can be hidden on
the main screen by changing the Icons
setting in the Settings / Display &
Sound menu
Check the Grid Limit setting
•
Reduce the load in the property
•
In a three phase installation, consider
•
rebalancing the property load across
the three phases
Check CT is installed correctly.
•
Advanced
zappi
and
House
Page 29 of 41
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