Specifications

GT-PCS Split Units - 60Hz Puron
®
Created: 29 Aug., 2013
62
Performance Troubleshooting
Functional Troubleshooting (cont.)
Unit Performance
Sentinel-Code 8
X Heating Mode LT2>125°F Check for poor air flow or overcharged unit
X
Cooling Mode LT1>125°F OR
LT2< 40°F
Check for poor water flow, or air flow
Swapped Thermistor
Code 9
X X LT1 and LT2 swapped Reverse position of thermistors
ECM Fault - Code 10
X X Blower does not operate
Check blower line voltage
Check blower low voltage wiring
Blower operating with incorrect
airflow
Wrong unit size selection
Wrong unit family selection
Wrong motor size
Incorrect blower selection
Low Air Coil Pressure Fault
(ClimaDry) Code 11
X Reduced or no air flow in cooling
or ClimaDry
Low Air Coil Temperature
Fault - (ClimaDry) Code 12
X Reduced airflow in cooling,
ClimaDry, or constant fan
Air temperature out of range
Check switch continuity and operation - replaceBad pressure switch
Air temperature out of range
Bad thermistor Check temp and impedance correlation per chart
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restrictions
Too high of external static - check static vs blower table
Too much cold vent air - bring entering air temp within
design parameters
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restrictions
Too high of external static - check static vs blower table
Too much cold vent air - bring entering air temp within
design parameters
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
IFC Fault Code 13
Internal Flow
Controller Fault
XX
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 C
lg
Possible Cause Solution
(Air Handler)