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2020 Sensata Technologies
Troubleshooting
4.0 Troubleshooting
4.1 Troubleshooting
Chart
The MSH3012RV inverter/charger is a fairly simple device to troubleshoot. The following chart is
designed to help you quickly pinpoint the most common inverter/charger failures.
Table 4-1, MSH3012RV Inverter/Charger Troubleshooting
Symptom
Possible Cause
Recommended Solution
No output power.
Inverter LED is
OFF.
Inverter is switched OFF.
Switch the inverter ON.
Battery voltage is too low.
The battery voltage level
has dropped below the Low
Battery Cutout (LBCO) set-
point for more than one
minute.
Check fuses/circuit-breakers and cable
connections. Check battery voltage at the
inverter’s terminals. Your batteries may
need to be charged, this fault condition
will automatically clear when the battery
voltage exceeds the LBCI voltage.
The battery voltage is
too high. The inverter
automatically resets and
resumes operation when the
battery voltage drops to the
HBCI voltage or lower.
This condition usually only occurs when an
additional charging source (alternator, solar
panels, or other external charging sources)
is used to charge the battery bank. Reduce
or turn off any other charger to the inverter
batteries to allow the voltage level to drop.
Over-temperature condition:
the internal temperature
of the inverter has risen
above acceptable limits;
caused by loads too great
for the inverter to operate
continuously, or by lack of
ventilation to the inverter.
When the unit has cooled, it
will automatically reset and
resume operation.
Reduce the number of electrical loads that
you are operating, this will avoid a repeat
over-temp shutdown if the cause was too
many loads for the ambient conditions.
Check ventilation around the inverter,
ensure cool air is available to pass through
the inverter (refer to the ventilation
requirements in Section 2.1.3).
AC overload condition:
the inverter has turned off
because the connected loads
are larger than the inverter’s
output capacity, or the
output wires are shorted.
Reduce the AC loads connected to the
inverter, or remove all AC output wiring
and restart the inverter.
Internal fault: this fault
occurs when an internal fault
is detected.
To clear this fault, an inverter reset is
required, see Section 4.4 to perform an
inverter reset.
No output power.
Status LED is
fl
ashing ON once
every second.
Unit is in Search mode,
which means load is too
small for Search mode circuit
detection.
Turn on a load greater than 5 watts to
bring inverter to full output power.
No output
power. Status
LED is
fl
ashing
very quickly—
fl
uttering.
Unit is in continuous reset.
Check that the inverter Power ON/OFF
switch is not stuck in the ON position
(ensure you can feel a click when pushing).
If not, the inverter requires repair/service.
