3
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
Troubleshooting Flow Chart
Did unit
start?
Check that unit
voltage reads:
197-254V
Does thermostat say
‘No Communication’?
The unit did
start but it
locked out
Establish power
Check that the
compressor is not in a
thermal overload
Check Fault Code
from thermostat
or service tool
No
Yes
Verify that
Dipswitch 1
on S3
is in ‘On’
position
Is there power
to DXM2 24V?
(18-31.5V)
A-W
A-Z
No
Fault
See Fault Codes
and Possible
Causes
A-F
Check that there
are 24 volts at CC on
DXM2 board and a call
for heating or cooling
A-K
Check for 24V at
contactor
18-31.5 volts
A-M
No
Replace the
DXM2 Board
Check and possibly
replace wiring
No
No
Yes
Yes
Next Page
Yes
Yes
No
A-A
If it is still not
communicating,
check the
thermostat wire
(Be sure it is not
running parallel
along power
wire). Ensure all
wiring is landed
properly on
both DXM2 and
thermostat.
Replace board if
current board still
does not function
Disconnect and
reconnect the
wires from the
DXM2. This
will reset the
thermostat.
Verify that
the DXM2’s
dipswitches
are set
properly.
Is the unit
properly
configured?
See Section
3.0 on page
56.
B-G
Hard
reset the
thermostat
B-K
Hook Service Tool up to
board. Does Service Tool
communicate with board?
Also ensure there
are no wire nuts;
solder wires if
they need to be
extended.
No
