Heat Controller DXM2 Application And Instruction Manual page 25

Heat Controller, Inc.
ESD - ERV Fault (DXM Only)
X
Green Status LED Code 3
X
No Fault Code Shown
X
X
X
X
Unit Short Cycles
X
X
X
X
Only Fan Runs
X
X
DXM2 UNIT CONTROLS
ERV unit has fault
X
(Rooftop units only)
X No compressor operation
X Compressor overload
X Control board
X Dirty air filter
X Unit in 'Test Mode'
X Unit selection
X Compressor overload
X Thermostat position
X Unit locked out
X Compressor overload
X Thermostat wiring
Functional Troubleshooting (cont.)
Troubleshoot ERV unit fault
See 'Only Fan Operates'
Check and replace if necessary
Reset power and check operation
Check and clean air filte r
Reset power or wait 20 minutes for auto exit
Unit may be oversized for space - check sizing for actual
load of space
Check and replace if necessary
Insure thermostat set for heating or cooling operation
Check for lockout codes - reset power
Check compressor overload - replace if necessary
Check thermostat wiring at DXM2 - put in Test Mode and
jumper Y1 and R to give call for compressor
25
Application, Operation, & Maintenance Manual