INVT SPC Series Operation Manual page 58

SPC Series Solar Pump Inverter
Fault code
A-LL
A-tF
A-tL
Fault type
Underload

pre-alarm
Full-water 
pre-alarm
Empty-water 
pre-alarm
Possible cause
The pumping pool
has no water.
The pumping pool is
full.
The pumping pool
has no water.
-54-
Fault diagnosis and solution
Solution
Check the pumping

pool.
If you have configured

the full-water pre-alarm
function, the device
automatically stops
when the pre-alarm
elapsed a period of
time. Otherwise, check
whether terminals are
wired correctly.
 If you have configured
the empty-water
pre-alarm function, the
device automatically
stops when the
pre-alarm elapsed a
period of time.
Otherwise, check
whether terminals are
wired correctly.