Progressive Industries EMS-PT50C - 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 1 Voltage High (Line 1 voltage above 132 volts)
E-4 Line 1 Voltage Low (Line 1 voltage below 104 volts)
E-5 Line 2 Voltage High (Line 2 voltage above 132 volts)
E-6 Line 2 Voltage Low (Line 2 voltage below 104 volts)
E-7 Line Frequency High (Line frequency above 69 cycles
per second)
E-8 Line Frequency Low (Line frequency below 51 cycles
per second)
E-10 Replace surge protector mode
Note: If the EMS cuts the power to the RV, it will show a PE
code following the E code. This denotes a previous error or
why the EMS shut down. Example: The EMS cuts power for
low voltage on Line 1, and then the power is restored. The
error code reads E0 but the PE code reads PE4 which tells
the user that low voltage was the reason for the EMS
previously cutting the 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.