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C l i m a t e M a s t e r W a t e r- S o u r c e H e a t P u m p s
C L I M A T E M A S T E R W A T E R - S O U R C E H E A T P U M P S
Tr a n q u i l i t y
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Advanced Diagnostics
If a communicating thermostat or diagnostic tool
(ACDU) is connected to the DXM2, additional diagnostic
information and troubleshooting capabilities are
available. The current status of all DXM2 inputs can be
verifi ed, including the current temperature readings of all
temperature inputs. With a communicating thermostat
the current status of the inputs can be accessed from
the Service Information menu. In the manual operating
mode, most DXM2 outputs can be directly controlled
for system troubleshooting. With a communicating
thermostat the manual operating mode can be accessed
from the Installer menu. For more detailed information
on the advanced diagnostics of the DXM2, see the
DXM2 Application, Operation and Maintenance (AOM)
manual (part #97B0003N15).
DXM2 Troubleshooting Process Flowchart/Functional
Troubleshooting Chart
The “DXM2 Functional Troubleshooting Process
Flowchart” is a quick overview of how to start diagnosing
a suspected problem, using the fault recognition features
of the DXM2 board. The “Functional Troubleshooting
Chart” on the following page is a more comprehensive
method for identifying a number of malfunctions that
may occur, and is not limited to just the DXM2 controls.
Within the chart are fi ve columns:
• The “Fault” column describes the symptoms.
• Columns 2 and 3 identify in which mode the fault is
likely to occur, heating or cooling.
• The “Possible Cause column” identifies the most likely
sources of the problem.
• The “Solution” column describes what should be done to
correct the problem.
Troubleshooting (Continued)
