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Heat Controller, Inc. HEV/H SERIES Installation, Operation & Maintenance
DXM2 PROCESS FLOW CHART
WARNING!
WARNING! HAZARDOUS VOLTAGE! DISCONNECT
ALL ELECTRIC POWER INCLUDING REMOTE
DISCONNECTS BEFORE SERVICING.
Failure to disconnect power before servicing can cause
severe personal injury or death.
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