Troubleshooting
900-0209-01-00 Rev A 57
Troubleshooting Error Messages
Error messages are caused by known faults. These are defined by a list of messages in the Charge
Controller Error screen of the system display. See page 38. See the system display literature for
instructions on navigating to this screen.
Table 8 shows the messages available in the system display. One or more messages will display Y to
indicate an error. If a message says N, it is not the cause of the error.
See Table 7 to troubleshoot symptoms not necessarily represented by error messages.
NOTE: Most errors shown in Table 8 are not accompanied by the red F
AULT LED indicator.
The exception is GFDI Fault.
Table 8 Error Messages
Message Symptom Problem
VOC Too High 24-volt system ≥ 275 V
oc
36-volt system ≥ 283 V
oc
48-volt system ≥ 290 V
oc
If the open-circuit voltage (V
oc
) is too high, the
FLEXmax 100 cannot safely operate. The controller
will automatically restart operation once the V
oc
decreases to a safe level.
Over Temperature Controller hot to the touch High temperature fault. Check controller temperature
(see page 38). The FLEXmax 100 will stop functioning
at an Output FETs reading of 90°C.
Shorted RTS Charging is not temperature-
compensated
Remote Temperature Sensor (RTS) damaged.
To test, remove or replace the RTS.
GFDI Fault
Red (F
AULT) LED indicator
illuminated (see page 30)
Ground fault. The detection circuit has sensed an
open connection on the GFDI fuse (see page 15).
Check the fuse. Make certain it is installed according
to the instructions. Inspect the rest of the system for
grounding problems or shorted connections.
Fault Input Active LED indicator(s) illuminated on
rapid shutdown device
Red (FAULT) LED indicator (see
page 30) will flash twice before
this occurs
Rapid shutdown condition. This is not a controller error
but a deliberate action. See pages 19 and 24 for more
information. Resetting this condition requires resetting
the external rapid shutdown device.
Reduced
Performance
Temperature reading is greater
than 142°C or less than -40°C
Internal temperature sensor failed. If a failure is
detected, the controller will operate with a maximum
output of 20 Adc.
Over Current Fault Controller has shut down This occurs if more than 80 amps flow from the battery
to the FLEXmax 100, or if more than 120 amps flow
from the controller to the battery.
To restart the FLEXmax 100, remove all power
from the controller and then reconnect the batteries.
If the problem recurs, loose or shorted contacts
may be present.
The PV array may also be oversized.
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