Daikin ComfortNet DX7TC Service Instructions Manual page 102

TROUBLESHOOTING
Troubleshooting
No Cool
No
Compressor
Running
Yes
No
Compressor
Pumping
Yes
No
Indoor Blower
Runnng
Yes
Reversing
No
Valve in Cool
Mode
Yes
Reversing
No
Valve Piped
Correctly
Yes
102
Wiring to
No No
Contactor
Compressor
Open
OK
Yes
Yes
Run Capacitor
No
230 Volts to
Unit
Yes
230 Volts to
Transformer
Reversing
No
Metering Device
valve stuck
Working Properly
between heat
and cool
Yes
Yes
24 Volts on G
No
Voltage to
from
Indoor Motor
Thermostat
Yes
Yes
24 Volts to No 24 Volts on O
Reversing Valve from Thermostat
Yes
Yes
Reversing
Valve
Solenoid Coil
Good
Yes
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
No
Thermostat in No
Cool Mode
Yes
No
HEAT PUMP - NO COOL
Heat Pump - No Cool
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
Replace Reversing Valve
Check Thermostat and
Thermostat Wires
Check control board no voltage
out of board replace board
Replace Indoor Motor
Check thermostat for proper
setting anf function
Check Thermostat and
Thermostat Wires
Check Internal Wiring to
Reversing Valve
Replace Reversing Valve
Solenoid
Replace Reversing Valve
Install Reversing Valve Correctly