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Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller, Inc.
Advanced Troubleshooting and Confi guration Information
Service Mode
The Service Mode provides the installer with several
functions for troubleshooting, including Manual Operation,
Control Diagnostics, Control Confi 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 Confi guration – The Dipswitch Confi guration
menus allow the installer to easily see the current DXM2
control confi 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 specifi c fault in the fault history
is selected, the operating mode and time when the fault
occurred are displayed, with options to select specifi 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 Confi 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.