Troubleshooting Chart - Daikin ComfortNet DX7TC Service Instructions Manual

TROUBLESHOOTING CHARTS
Com plaint
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
Pow er Failure
Blow n Fuse
Loose Connection
Shorted or Broken Wires
Open Fan Overload
Faulty Thermostat
Faulty Transformer
Shorted or Open Capacitor
Internal Compressor Overload Open
Shorted or Grounded Compressor
Compressor Stuck
Faulty Compressor Contactor
Faulty Fan Relay
Open Control Circuit
Low Voltage
Faulty Evap. Fan Motor
Shorted or Grounded Fan Motor
Improper Cooling Anticipator
Shortage of Refrigerant
Restricted Liquid Line
Open Element or Limit on Elec. Heater
Dirty Air Filter
Dirty Indoor Coil
Not enough air across Indoor Coil
Too much air across Indoor Coil
Overcharge of Refrigerant
Dirty Outdoor Coil
Noncondensibles
Recirculation of Condensing Air
Infiltration of Outdoor Air
Improperly Located Thermostat
Air Flow Unbalanced
System Undersized
Broken Internal Parts
Broken Valves
Inefficient Compressor
Wrong Type Expansion Valve
Expansion Device Restricted
Oversized Expansion Valve
Undersized Expansion Valve
Expansion Valve Bulb Loose
Inoperative Expansion Valve
Loose Hold-dow n Bolts
Faulty Reversing Valve
Faulty Defrost Control
Faulty Defrost Thermostat
Flow rator Not Seating Properly
36
COOLING/HP ANALYSIS CHART
No Cooling
•
• • •
• • •
• • • • • •
• •
• • • •
• •
• • • • •
•
• •
• • •
• • •
•
•
• • •
•
•
• •
• •
• •
♦
•
•
•
• •
• •
•
•
•
• •
•
•
•
•
• • •
• • •
•
• • •
• •
•
•
•
•
Cooling or Heating Cycle (Heat Pum p)
System
Unsatisfactory
Operating
Cooling/Heating
Pressures
♦
♦
•
• •
♦
• •
♦
• • •
• • •
• • •
•
♦
• • •
♦
•
♦
•
♦
•
• •
•
•
•
♦
• • •
• •
♦
• • •
• • •
• •
• •
•
•
♦ ♦ ♦ ♦ ♦ ♦
♦ ♦ ♦ ♦ ♦
♦ ♦ ♦ ♦ ♦ ♦ ♦
• •
♦
Heating Cycle Only (Heat Pum p)
Test Method
Remedy
Test Voltage
Inspect Fuse Size & Type
Inspect Connection - Tighten
Test Circuits With Ohmmeter
Test Continuity of Overload
Test Continuity of Thermostat & Wiring
Check Control Circuit w ith Voltmeter
Test Capacitor
Test Continuity of Overload
Test Motor Windings
Use Test Cord
Test Continuity of Coil & Contacts
Test Continuity of Coil And Contacts
Test Control Circuit w ith Voltmeter
Test Voltage
♦ Repair or Replace
•
Test Motor Windings
Check Resistance of Anticipator
Test For Leaks, Add Refrigerant
•
Remove Restriction, Replace Restricted Part
Test Heater Element and Controls
♦
Inspect Filter-Clean or Replace
♦
Inspect Coil - Clean
♦
Check Blow er Speed, Duct Static Press, Filter
Reduce Blow er Speed
Recover Part of Charge
•
Inspect Coil - Clean
•
Recover Charge, Evacuate, Recharge
•
Remove Obstruction to Air Flow
Check Window s, Doors, Vent Fans, Etc.
Relocate Thermostat
Readjust Air Volume Dampers
Refigure Cooling Load
Replace Compressor
Test Compressor Efficiency
Test Compressor Efficiency
♦
Replace Valve
•
Remove Restriction or Replace Expansion Device
•
Replace Valve
Replace Valve
Tighten Bulb Bracket
Check Valve Operation
Tighten Bolts
Replace Valve or Solenoid
♦ Test Control
Test Defrost Thermostat
Check Flow rator & Seat or Replace Flow rator
S-1
S-1
S-2, S-3
S-2, S-3
S-17A
S-3
S-4
S-15
S-17A
S-17B
S-17D
S-7, S-8
S-7
S-4
S-1
S-16
S-16
S-3B
S-101,103
S-112
S-26,S-27
S-200
S-200
S-113
S-114
S-115
S-104
S-104
S-110
S-110
S-105
S-110
S-21, 122
S-24
S-25
S-111