5
Tranquility
®
D i g i t a l ( D X M 2 ) — Tr o u b l e s h o o t i n g G u i d e
R e v. : 1 0 M a r c h , 2 0 1 5
w w w. c l i m a t e m a s t e r. c o m
No
Yes
Replace wire
harness
No
Continued
Troubleshooting Flow Chart
Verify in
configuration
that the unit
is configured
correctly for ECM
Yes
Check continuity on
communicating harness
from DXM2 to Module.
Is there a broken wire?
No
Is 197-254V at the
blower motor?
Check the wire
harness and
replace if needed
Replace
defective part
Next Page
Does blower
turn on?
Verify that
the wiring on
the valve and
DXM2 Board
are correct.
See wiring
diagrams on
pages 53-54.
Valve does
function but
when the unit
shuts off, the
valve remains
open.
Verify that the DC voltage on DXM2
between A0-2 and GND. Voltage should
be between 3.3-10VDC. This is the output
from the board to the valve.
Verify 3/4” Valve Dipswitch
or 1” Valve Dial
A-X
A-C
Yes
B-I
The unit uses
a modulating
valve but the
thermostat
continues
to show a
variable-
speed pump.
Connect a piece of thermostat wire
between T1 and GND on DXM2 so the
DXM2 board sees no feedback.
B-J
No
No
Check DC voltage on
DXM2 on packaged
or AXM on split with
communicating harness
to blower connected 12V–
GND should read 9–15V
Does the motor try to spin
when giving a ‘G’ call?
Use Emerson EZ Tool to
troubleshoot motor and
verify motor or module
B-F
B-M
