Tuesday, February 15, 2011

Fault Indications and Reset Procedures for the Prosine 2.5 Inverter


There are still many of you traveling around the country in earlier model coaches that have a Prosine 2.5 Inverter/Charger. These units were installed as original equipment on coach year models 1999 through 2005. If you encounter a fault condition with this particular Inverter/Charger here is some information that may be helpful.

When a recoverable fault occurs usually there will be an indication on the Prosine Interior Remote Control panel.


Control Panel Indication
Fault Condition
16.75 Volt LED and Warning Light blinking
Battery Voltage Too High
10.00 Volt LED and Warning Light blinking
Battery Voltage Too Low
400 Amp LED and Warning Light blinking
Battery Current Too High, probable AC Overload
Warning, Fault, Temp LED’s blinking
System Over-temperature
Warning, Fault LED’s blinking
Communications error or temporary fault


For fault conditions that don’t appear to correct themselves, you can power down the Prosine Inverter/Charger and reset it by sliding the “BYPASS/ON” switch located on the side of the inverter chassis to the “BYPASS” position, wait for a few seconds, and then switch it back to “ON”
NOTE: The “BYPASS/ON switch is very delicate and is not readily visible from a distance, use every caution not to damage the switch while attempting a reset.

If the fault is not corrected by this method, it may be that battery power input will need to be disconnected, to accomplish a battery disconnect reset:

1)      Turn off the battery charger and inverter on the interior control panel
2)      Slide the “BYPASS/ON” switch to the “BYPASS” position.
3)      Disconnect the DC Negative battery cable from the base of the Inverter chassis.
4)      Wait 15 minutes
5)      Reconnect Negative battery cable
6)      Slide the “BYPASS/ON” Switch back to the “ON” position.
7)      Reconnect shore power if available and check to see if faults are cleared.

After attempting these resets, if the unit still does not operate or has continuous fault indications it should be taken to a qualified service center for further diagnosis.

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