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Heat Controller, Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual
Use the following troubleshooting fl ow chart to fi nd appropriate troubleshooting strategies on the following pages
for the DXM2 control and most water source heat pump applications.
Troubleshooting Chart
See “Does
not Operate
in Clg”
See “Only
Comp
Runs”
Start
Did Unit
Attempt to
Start?
Did Unit
Lockout at
Start-up?
Unit Short
Cycles?
Only Fan
Runs?
Only
Compressor
Runs?
Did unit lockout
after a period of
operation?
Does unit
operate in
cooling?
Unit is OK!
‘See Performance
Troubleshooting’ for
further help
Check Main
power (see power
problems)
Check fault code on communicating
thermostat (ATC32) or Configuration
and Diagnostics Tool (ACD01)
Yes
No
No
No
No
No
Yes
No
Yes
See fault codes in table
on following page
No fault
shown
Replace
DXM2
See “Unit
short
cycles”
See “Only
Fan Runs”
No
Yes
Yes
Yes
Yes
DXM2 Functional
Troubleshooting Flow Chart