6-20 l Trou ble sh oo ti ng
Additional Alarms
Along with the Passive and Shutdown alarms, you may encounter additional error
messages that indicate a problem with the control.
Problem
Er. Lo - There is a problem in
the sensor connection (RTD,
Dewpoint sensor, etc.) for the
affected function.
Er. Hi - There is a problem in
the analog input section of the
control.
Possible cause
Problem in the analog input section of
the control.
Defect in the main control board.
RTD is not connected properly or is
defective.
The ribbon cable between an analog
option board and the main control
board is not connected properly.
Connector to all RTDs is removed.
Problem in the analog input section of
the control.
Defect in the main control board.
Solution
Check that all jumpers are in their
proper place.
Check to see if the dewpoint sensor
is connected properly.
Disconnect the ribbon cable connect-
ing 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.
Check RTD connections.
Replace defective RTD.
Check connections between analog
option board and the main control
board.
Disconnect the ribbon cable connect-
ing 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.
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