ClimateMaster Tranquility Digital DXM2 - Page 6

Tranquility
®
Digital (DXM2)—Troubleshooting Guide
Rev.: 10 March, 2015
6
Geothermal Heating and Cooling
Replace
defective
wiring
No
Verify that
Dipswitch 1:4
is on
No
Call for
cooling
Unit starts but
does not shift
to cooling
Continued
Verify that
you have
cooling
call at
thermostat
No
Yes
Check
reversing valve
connection at
DXM2. Do you
have 24 VAC?
Yes
A-U
Verify
24V at
reversing
valve
Yes
Replace
solenoid on
reversing valve
Yes
In order to increase pressure
and move a reversing valve
that is sticking, place unit
in heating mode and then
remove blower door. Just after
removing door, energize the
valve. If it still doesn’t shift, try
a strong magnet to pull over
internal slide while energizing.
A-T
B-H
Verify RV
operation
Replace the reversing valve if
it still does not shift
Next Page
If Dipswitch 1:4
is on, replace
board
A-E
Troubleshooting Flow Chart
There are
no faults,
but does the
compressor
start?
Verify comp contactor.
Verify capacitor. Turn off
power and allow 5 minutes
for discharge. Then verify
with volt meter the UF
reading compare to UF
reading on capacitor. Is
capacitor good?
No
A-N
Replace capacitor.
No
Yes
Verify voltage to
compressor at
molded plug
Replace molded
plug and wire
harness
A-Q
Turn power off and
remove molded plug on
compressor. Measure
resistance between C-S
and C-R.
Replace compressor
A-D
Yes
A-A
Yes
No
Yes
Yes
Is the
blower loud?
Check your
model’s airow
conguration.
See Section 3.1
on page 56.
Check static
pressure
B-D
No
Verify that
all grilles
and registers
are open.