Daikin ComfortNet DX7TC Service Instructions Manual page 103

TROUBLESHOOTING
Troubleshooting
Yes
No
Metering Device
Working Properly
Yes
No
2nd Stage
Operating
Yes
Check voltage
No
to 2nd stage
solenoid
Check
Yes
resistance of the
unloader coil
No
Solenoid coil
has continuity
Coil shows
Yes
No
infinite, zero
or ground
Yes
HEAT PUMP - NO COOL
Heat Pump - No Cool
Repair or replace Metering
Device
Check for proper charge.
Check subcooling and/or
superheat
Check wires and voltage at
control board
Check compressor windings
Check compressor windings and
if faulty, replace compressor
Replace compressor
Unit operating properly
103