![background image](http://html.mh-extra.com/html/carrier/pro-dialog-plus-30gk-series/pro-dialog-plus-30gk-series_installation-operation-and-maintenance-instructions-manual_2562220035.webp)
35
ALARM CODE DESCRIPTIONS
Code
Alarm name
Action
Pumpdown
Reset type
Probable cause
101
DGT fault, compressor A1
Circuit A shut down
No
Manual
Hot gas thermostat contact open
102
Starter Guard fault compressor A1
Circuit A shut down
No
Ditto
Crankcase heater fault and open motor current
fault detection board contact
201
DGT fault, compressor A2
Compressor A2 shut down
Ditto
Hot gas thermostat contact open
202
Starter Guard fault compressor A 2
Compressor A2 shut down
Ditto
Crankcase heater fault and open motor current
fault detection board contact
301
DGT fault, compressor A3
Compressor A3 shut down
Ditto
Hot gas thermostat contact open
302
Starter Guard fault compressor A 3
Compressor A3 shut down
Ditto
Crankcase heater fault and open motor current
fault detection board contact
401
DGT fault, compressor A4
Compressor A4 shut down
Ditto
Hot gas thermostat contact open
402
Starter Guard fault compressor A 4
Compressor A4 shut down
Ditto
Crankcase heater fault and open motor current
fault detection board contact
501
DGT fault, compressor B1
Circuit B shut down
No
Ditto
Hot gas thermostat contact open
502
Starter Guard fault compressor B1
Circuit B shut down
No
Ditto
Crankcase heater fault and open motor current
fault detection board contact
601
DGT fault, compressor B2
Compressor B2 shut down
Ditto
Hot gas thermostat contact open
602
Starter Guard fault compressor B 2
Compressor B2 shut down
Ditto
Crankcase heater fault and open motor current
fault detection board contact
701
DGT fault, compressor B3
Compressor B3 shut down
Ditto
Hot gas thermostat contact open
702
Starter Guard fault compressor B3
Compressor B3 shut down
Ditto
Crankcase heater fault and open motor current
fault detection board contact
801
DGT fault, compressor B4
Compressor B4 shut down
Ditto
Hot gas thermostat contact open
802
Starter Guard fault compressor B4
Compressor B4 shut down
Ditto
Crankcase heater fault and open motor current
fault detection board contact
6.4.1 - Compressor faults
6.4.1.1 - General
Each compressor is protected against multiple faults by two
digital inputs located on the control board. If one of these
inputs opens, it causes an immediate shutdown on the
compressor without any action from the basic board.
6.4.1.2 - Compressor protection devices
On PRO-DIALOG Plus units, compressors are individually
protected by the following devices connected to the digital
inputs on the compressor control board:
DGT (only for units with low-temperature option):
The discharge gas thermostat detects and protects the
compressor against abnormally high discharge temperatures.
Starter Guard:
This board patented by Carrier (also called AM board)
monitors both the compressor regime and the status of its
crankcase heaters which ensure correct lubrication when the
compressor starts.