58
SECTION 5, continued
Message1 Probable Cause Corrective Action
E1
Dilution water is ≥ 0.5 FNU. Start calibration over with better
quality dilution water or use a
membrane filter to filter the water
before use.
E2
Two standards have the same
value or their difference is less
than 60 FNU.
Not all standards were read
during the calibration.
Standard 1 is too low (<10 FNU).
Recheck preparation of standards
and repeat calibration.
E3
Low light error. Re-read measurement.
Check lamp2
Check for obstructed light path.
Dilution may be necessary.
E4
EEPROM malfunction. Check sum failed. Press I/O.
If E4 reappears, call Hach
service. If CAL? appears,
recalibrate.
E5
A/D overrange. Check for obstructed light path.
Call Hach Service.
E6
A/D underrange. Check for open lid during reading
and re-read. Check for obstructed
light path. If persists, call Hach
Service.
E7 Light Leak. Close lid before pressing
READ.
E8
Bad lamp circuit. Reinsert lamp leads at terminal
block-make sure the lead ends are
not touching each other.If this
fails, call Hach Service.
1 Error messages 4, 5, and 6 may indicate a failure in the internal electronics.
2 Check lamp by inserting a pencil or piece of paper into the cell compartment and
pressing
READ. Light should be visible on the inserted object.
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