T h e Q u a l i t y L e a d e r i n C o n d i t i o n i n g A i r
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R e v. : 0 3 A u g u s t , 2 0 1 2
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37
Advanced Troubleshooting and Con
fi
guration Information
Service Mode
The Service Mode provides the installer with several
functions for troubleshooting, including Manual Operation,
Control Diagnostics, Control Con
fi
guration, and Fault History.
Manual Operation – The Manual Operation mode allows the
installer to bypass normal thermostat timings and operating
modes, to directly activate the thermostat inputs to the
DXM2, activate the DXM2 Test mode, and directly control the
ECM blower, internal
fl
ow center, and proportional valve.
Control Diagnostics – The Control Diagnostics menus allow
the installer to see the current status of all DXM2 control
switch inputs, values of all temperature sensor inputs, control
voltage, ECM blower, internal
fl
ow center, and proportional
valve operating status and parameters.
Dipswitch Con
fi
guration – The Dipswitch Con
fi
guration
menus allow the installer to easily see the current DXM2
control con
fi
guration.
Fault History – In addition to the fault code, the DXM2 stores
the status of all control inputs and outputs when a fault
condition is detected. The fault history covering the last
fi
ve
lockout conditions is stored and may be retrieved from the
DXM2. After a speci
fi
c fault in the fault history is selected,
the operating mode and time when the fault occurred are
displayed, with options to select speci
fi
c control status values
when the lockout occurred.
Fault Temp Conditions – This option displays the DXM2
temperature and voltage values when the lockout occurred.
Fault Flow Conditions – This option displays the DXM2 ECM
blower, pump, and valve operating parameters when the
lockout occurred.
Fault I/O Conditions – This option displays the status of
the DXM2 physical and communicated inputs and the relay
outputs when the lockout occurred.
Fault Con
fi
guration Conditions – This option displays the
status of the DXM2 option selections when the lockout
occurred.
Fault Possible Causes – This option displays a list of
potential causes of the stored fault.
Clear Fault History – The Clear Fault History option allows
the fault history stored in the non-volatile memory of the
DXM2 to be cleared.
