Daikin ComfortNet DX7TC Service Instructions Manual page 101

TROUBLESHOOTING
Troubleshooting
No Cool
No
Compressor
Running
Yes
No
Compressor
Pumping
Yes
No
Indoor Blower
Runnng
Yes
No
2nd Stage
Operating
Yes
Wiring to
No No
Contactor
Compressor
Open
OK
Yes
Yes
Run Capacitor
No
230 Volts to
Unit
Yes
230 Volts to
Transformer
Metering Device
No
Working Properly
Yes
24 Volts on G
No
Voltage to
from
Indoor Motor
Thermostat
Yes
Yes
Check voltage
No
to 2nd stage
solenoid
Check
Yes
resistance of the
unloader coil
No
Good
Yes
Compressor
Compressor
No
Overload
Open
Yes
Compressor
Warm to
Touch
No
Yes
No
24 Volts from
Transformer
Yes
24 Volts on Y
from
Thermostat
Yes
No
No
Solenoid coil
has continuity
Coil shows
Yes
No
infinite, zero
or ground
Yes
Repair or Replace Wiring
Replace Capacitor
No
Check for Stuck Compressor
Windings
Open
Yes
Replace Compressor
No
Replace Compressor
Yes
Did Compressor
No
Replace Compressor
Restart After
Allowing to Cool
Yes
Check Refrigerant Charge and
Amp Draw
Check Breakers or Fuses
Check Wiring from Contractor to
Transformer
Replace Transformer
No
Check Thermostat and
Thermostat Wiring
No
24 Volts to
Check Pressure Switches and
Contactor Coil
Wiring
Yes
Replace Contactor
Repair or Replace Metering
Device
Replace Compressor
Check Thermostat and
Thermostat Wires
Check control board no voltage
out of board replace board
Replace Motor
Check wires and voltage at
control board
Check compressor windings
Check compressor windings and
if faulty, replae compressor
Replace compressor
Unit operating properly
AC - NO COOL
AC - No Cool
101