Additional Alarms
Along with the alarm indicators, you may encounter additional messages that
indicate a problem within the control.
Troubleshooting l 6-23
6
Troubleshooting
Problem
Er. H - There is a problem in
the analog input section of the
control.
Possible cause
Defect in the main control board.
RTD is not connected properly or is
defective.
Connector to all RTDs are removed.
The ribbon cable between an analog
option board and the main control
board is not connected properly.
Problem in the analog input section of
the control.
Defect in the main control board.
Solution
Replace main control board.
Check RTD connections, replace
defective RTD(s)
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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