Compu-aire SYSTEM 2100 Installation, Operation And Maintenance Manual page 29

Complaint
2. Nothing is visible
on the display or is
barely visible.
3. Temperature or
humidity displayed is
wrong.
Rev. 01
05/27/2016
Problem
Display contrast is
adjusted too low.
Sensor circuits are out
of calibration.
Wiring to sensor
circuit board(s) are
loose or broken.
Page 29 of 42
Symptom
Power is on and
system is running
okay. But, nothing is
visible or is barely
visible on display.
Displayed value(s) are
wrong by a few
increments.
Display shows very
high or low values or
values that change
erratically.
Action
Refer to the section
MCP Circuit
Adjustments, in this
guide. Adjust display
contrast for best
visibility. The display
will not be visible
unless light is directed
into it (it does not
have its own light
source).
If the value is wrong
by a few degrees or
percent when
compared to an
accurate measuring
instrument, then try
recalibrating the
sensor circuits (see
the section MCP
Circuit Adjustment, in
this guide).
Check all wiring
between the sensor
circuit board and the
MCP for loose
connections. If the
values
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