
Comfort Chek
400 Operation Manual
12 1509-9000 Rev 4
Figure 4-14. 75% Cal Mode
5. TROUBLESHOOTING
5.1. Cannot Power On
Press the SET button for more than 1 second and try again. In using batteries, ensure
that the batteries are making good contact and that they are installed with the correct
polarity. Otherwise, ensure that the wall adapter is connected and plugged in.
5.2. Fixed (Unchanging) Readings
Verify that the data hold function is not activated. In data hold mode, the HOLD icon
is displayed at top left corner of LCD.
5.3. Slow Response
Ensure that the air flow vents on the rear of the instrument are not blocked.
5.4. Error Codes and Descriptions
Error Code Description
E01 CO
2
sensor damage
E02 The value is under range
E03 The value is over range
E04 The original data error result in this error (DP, WB)
E07
Battery voltage too low to measure CO
2
. Replace batteries or use
wall adapter.
E11 Retry humidity calibration
E17 Retry CO
2
calibration
E31 Temperature sensor damaged
E34 Humidity sensor damaged
5.5. Service Centers
Bacharach, Inc.
621 Hunt Valley Circle
New Kensington, PA 15068
USA
Phone: 724-334-5051
Fax: 724-334-5723
Email: help@MyBacharach.com
Bacharach of Canada, Inc.
20 Amber St. Unit# 7
Markham, Ontario L3R SP4
Canada
Phone: 905-470-8985
Fax: 905-470-8963
Email: bachcan@idirect.com
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