Progressive Industries EMS-PT30C - Manual (Page 5)

Error Code Chart
E-0 Normal Condition
E-1 Reverse Polarity Condition (hot and neutral wires reversed)
E-2 Open Ground (means no ground wire connection)
E-3 Line Voltage High (line voltage above 132)
E-4 Line Voltage Low (line voltage below 104)
E-7 Line Frequency High (line frequency above 69 cycles per
second)
E-8 Line Frequency Low (line frequency below 51 cycles per
second)
E10 Replace surge protector module
NOTE: If the EMS cuts the power to the RV, it will show a PE
code following the E code. This denotes the previous error or why
the EMS shut down. Example: The EMS cuts power for low
voltage and then the power is restored. The error code reads EO
but the PE code reads PE4 which tells the user low voltage was
the reason for the EMS previously cutting power. This PE error
code will be deleted when power is disconnected from the EMS.
Accidental 240 Volt protection
Should this condition occur, the display will read 240 volts instead
of displaying the voltage and the error code message will read E-3.
AC power will shut down instantly. DO NOT UNDER ANY
CIRCUMSTANCES BYPASS THE EMS; OTHERWISE,
THIS WILL RESULT IN SEVERE DAMAGE TO THE RV.