Comfort-Aire HTS Series Split System,Two Stage, 2-5 Tons - Manual (Page 41)

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Installation, Operation & Maintenance HTS SERIES SPLIT SYSTEM Heat Controller, LLC
Functional Troubleshooting
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 filte r
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
X X
ERV unit has fault
(Rooftop units only)
Troubleshoot ERV unit fault
jumper Y1 and R to give call for compressor
IFC Fault Code 13
Internal Flow
Controller Fault X X No pump output signal Check DC voltage between A02 and GND - should be
between 0.5 and 10 VDC with pump active
Low pump voltage Check line voltage to the pump
No pump feedback signal Check DC voltage between T1 and GND. Voltage should
be between 3 and 4 VDC with pump OFF, and between
0 and 2 VDC with the pump ON
Bad pump RPM sensor Replace pump if the line voltage and control signals are
present at the pump, and the pump does not operate
Fault Htg Clg Possible Cause Solution