Compressor Will Not Run, No Line Power at Contactor
X
X
X
X
Compressor Will Not Run Power at Contactor
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Compressor "Hums" But Will Not Start
X
X
X
X
X
X
X
X
Compressor Cycles on Overload
X
X
X
X
X
X
X
X
X
X
X
Thermostat Check Light On, Unit in Lock-out Mode
X
X
X
X
X
X
X
X
X
Compressor Of
f on High Pressure
Control (Green Diagnostic Light Flashing)
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Compressor Of
f on Low Pressure
Control (Orange Diagnostic Light Flashing)
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Compressor Of
f on Flow Switch
(Red Diagnostic Light Flashing)
x
X
X
X
X
X
X
X
X
X
X
X
X
X
Compressor Noisey
X
X
X
X
X
X
X
X
X
X
X
Head Pressure
Too High
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Head Pressure
Too Low
X
X
X
X
X
X
X
X
X
X
X
X
Suction Pressure
Too High
X
X
X
X
X
X
X
X
X
X
X
Suction Pressure
Too Low
X
X
X
X
X
X
X
X
X
X
X
X
X
X
High
Compressor Amps
Excessive W
ater Usage
X
X
Compressor Runs Continuously - No Cooling
X
X
X
X
X
X
X
X
Liquid Refrigerant Flooding Back to Compressor
X
X
X
X
X
X
X
X
X
X
X
X
Compressor Runs Continuously - No Heating
X
X
X
X
X
X
X
Reversing V
alve Does Not Shift
X
X
Liquid Refrigerant Flooding Back to Compressor
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Excessive Operation Costs
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Ice in W
ater Coil
X
X
X
X
X
X
Power Failure
Blown Fuse or Tripped Breaker
Faulty Wiring
Loose Terminals
Low Voltage
Defective Contacts in Contactor
Faulty Wiring
Time Delay + Random Start Sequence Not
Timed Out
Loose Terminals
Control Tranformer (has circuit breaker)
Voltage (T
ransformer has 208 & 240V Taps & Geothermal
Logic Control has over/under voltage protection)
Thermostat
Contactor Coil
High Pressure Trip (Green Diagnostic Light)
Low Pressure Trip (Orange Diagnostic Light)
Flow Switch Trip (Red Diagnostic Light)
Bad Compressor Capacitor
Compressor Internal Thermal Overload Open
Bearings Defective
Seized
Busted Internal Scroll
Motor Winding Defective
Refrigerant Charge Low
Refrigerant Overcharge
High Head Pressure
Low Head Pressure
High Suction Pressure
Low Suction Pressure
Non-Condensables
Faulty Expansion Valve
Leaking/By-Passing
Partially Shifting
Defective Valve or Coil
Scaled or Plugged Coil (Htg.)
Scaled or Plugged Coil (Clg.)
Water V
olume Low (Htg.)
Water V
olume High (Htg.)
Water V
olume Low (Clg.)
Water V
olume High (Clg.)
High Water
Temperature (Clg.)
High Water
Temperature (Htg.)
Low Water
Temperature (Clg.)
Low Water
Termperature (Htg.)
Scaled or Plugged Coil (Htg.)
Scaled or Plugged Coil (Clg.)
Water V
olume Low (Htg.)
Water V
olume High (Htg.)
Water V
olume Low (Clg.)
Water V
olume High (Clg.)
High Water
Temperature (Clg.)
High Water
Temperature (Htg.)
Low Water
Temperature (Clg.)
Low Water
Termperature (Htg.)
Solenoid Valve Stuck Closed (Htg.)
Solenoid Valve Stuck Closed (Clg.)
Solenoid Valve Stuck Open (Htg. or Clg.)
Source Water Pump Faltering (Htg.)
Source Water Pump Faltering (Clg.)
Load Water Pump Faltering (Htg.)
Load Water Pump Faltering (Clg.)
POWER SUPPL
Y - CONTROL
SYSTEM ISSUE
MAIN SYSTEM ISSUES
EXT
. SYSTEM ISSUES
Line V
oltage
Low V
oltage
Compressor
Refrigerant System
Rev
.V
alve
Source W
ater Coil
Load W
ater Coil
W
ater System
Manual 2100-583G
Page
45 of 48
TROUBLESHOOTING