Specifications

31
Problem Possible Causes Action
Display reads “Er1”. Air in system. Purge air from system by
(Purity measurement error) drawing off water according to
the instructions in the Operation
section.
Resistivity cell not connected to Check resistivity cell lead
PCX70 meter board connection (P1). connections (P1) on circuit board.
(See exploded views on Fig. 11)
Resistivity cell dirty. Clean cell and reinstall.
Resistivity cell out of tolerance. Replace resistivity cell.
Display reads “Er2”. Water supply not available. Check water supply connection
(Water supply error) and/or level in storage tank.
Momentary loss of internal feedwater
pressure.
Pressure switch not connected Check pressure switch connection
properly. (J3) at display/control board
PC1286X1. (See Wiring Diagram)
Internal pressure switch out of Replace pressure switch. Call
tolerance. Technical Service.
Display reads “Er4”. Resistivity cell not connected to Check resistivity cell lead
(Cell temperature sensor error) meter board (PCX70). connection (P1) on meter board.
(PCX70) See Fig. 11.
Resistivity cell dirty. Clean cell and reinstall.
Resistivity cell temperature Replace resistivity cell (E703X1A).
sensor out of tolerance.
Meter board out of tolerance. Replace meter board (PCX70).
Call Technical Service.
Display reads “Er5”. PC board communication trouble. Cycle power.
(Meter board data error)
Meter board not connected Check connection from meter
to display/control board. board (PCX70 10 pin connector)
to display/control board (J2).
Refer to Wiring Diagram.
Meter board (PCX70) out of Replace meter board (PCX70).
tolerance. Call Technical Service.
TROUBLESHOOTING
Error Conditions