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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
No output power.
Inverter is switched OFF.
Inverter LED is
Battery voltage is too low.
OFF.
The battery voltage level
has dropped below the Low
Battery Cutout (LBCO) set-
point for more than one
minute.
The battery voltage is
too high. The inverter
automatically resets and
resumes operation when the
battery voltage drops to the
HBCI voltage or lower.
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.
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.
Internal fault: this fault
occurs when an internal fault
is detected.
No output power.
Unit is in Search mode,
Status LED is
which means load is too
fl ashing ON once
small for Search mode circuit
every second.
detection.
No output
Unit is in continuous reset.
power. Status
LED is fl ashing
very quickly—
fl uttering.
© 2020 Sensata Technologies
Recommended Solution
Switch the inverter ON.
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.
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.
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).
Reduce the AC loads connected to the
inverter, or remove all AC output wiring
and restart the inverter.
To clear this fault, an inverter reset is
required, see Section 4.4 to perform an
inverter reset.
Turn on a load greater than 5 watts to
bring inverter to full output power.
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.
Troubleshooting
Page 46
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Table of Contents
Troubleshooting
