User guide

Troubleshooting l 6-15
Additional Alarms
Along with the alarm indicators, you may encounter additional messages that indi-
cate a problem within the control.
Problem
CoS Er.4 or Co5 Er. 4 -
Displayed when the “Start”
button is pushed during any
active alarm. (Passive or
Shutdown)
CoS Er.0 or Co5 Er.0 -
Indicates there is a problem in
the communication between
the control board and the
display board.
Err 004 - Indicates a mis-
match of software between the
display board and the control
board.
Er. L - There is a problem in
the sensor connection (RTD,
dewpoint sensor, etc.) for the
effected function.
Possible cause
The dryer will continue to run if there is
a passive alarm, however it will not start
if there is a active alarm.
Loose or improperly connected wire.
Improper dip switch setup on control
board.
Defective display board or control board.
The software revision of the display
board and control board are not compati-
ble.
Problem in the analog input section of
the control.
Defect in the main control board.
Solution
Push the alarm acknowledgement button
to identify the alarm, and address it as
necessary.
Check wiring between control board and
display board.
Check dip switch setup on control board.
Replace boards in sets to maintain
software compatibility.
In most cases, both display and control
boards will need to be replace as a set.
Check that all jumpers are in their
proper place.
Check to see if the dewpoint sensor is
connected properly.
Disconnect the ribbon cable connecting
any analog option boards to the main
control board. If the display returns to
normal for all values except those that
are generated through the analog options
boards, replace the option board.
Replace main control board.
6
Troubleshooting