Hanna Instruments PCA 300 Series - Manual (Page 51)

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Check the dip switches for proper configuration.
Also, when in DIAG 100, “E03” can occur if the user does
not press DIAG again before the displayed DVM reading
goes above:
a. 100 mV, with 0-1 V dip switch setting
b. 10 mV, with 0-100 mV dip switch setting
c. 1 mV, with 0-10 mV dip switch setting.
Another possibility is hardware failure.
ERROR 4 - INVALID FULL-SCALE ADJUSTMENT OF RECORDER OUTPUT
The manual (fine) full-scale adjustment of the recorder out-
put in the DOWN direction (DIAG 103) could not be
performed.
Check the dip switches for proper configuration.
Also, when in DIAG 103, “E04” can occur if the user does
not press DIAG again before the displayed DVM reading
goes below:
a. 0.9 V, with 0-1 V dip switch setting
b. 90 mV, with 0-100 mV dip switch setting
c. 9 mV, with 0-10 mV dip switch setting.
Another possibility is hardware failure.
ERROR 5 - INVALID VALUE
The user attempted to set a sampling rate out of range (5
to 90 minutes).
ERROR 6 - INVALID VALUE
The user attempted to set one of the following above
5.00 mg/L:
1. recorder min/max;
2. alarm setpoint;
3. proportional dosing setpoint.
ERROR 7 - INVALID VALUE
The user attempted to set REC.MIN at a higher value than
REC.MAX.