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Heat Controller, Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual
Functional Troubleshooting (cont.)
No Fault Code Shown
X X No compressor operation See 'Only Fan Operates'
X X Compressor overload Check and replace if necessary
X X Control board Reset power and check operation
Unit Short Cycles
X X Dirty air filter Check and clean air filter
X X Unit in 'Test Mode' Reset power or wait 20 minutes for auto exit
X X Unit selection
Unit may be oversized for space - check sizing for actual
load of space
X X Compressor overload Check and replace if necessary
Only Fan Runs
X X Thermostat position Insure thermostat set for heating or cooling operation
X X Unit locked out Check for lockout codes - reset power
X X Compressor overload
Check compressor overload - replace if necessary
X X Thermostat wiring
Check thermostat wiring at DXM2 - put in Test Mode and
ESD - ERV Fault (DXM Only)
Green Status LED Code 3
XX
ERV unit has fault
(Rooftop units only)
Troubleshoot ERV unit fault
jumper Y1 and R to give call for compressor