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Manual 2100-532B
Page 44 of 46
Heat Gen.
Power Failure
Blown Fuse or Tripped Breaker
Faulty Wiring
Loose Terminals
Low Voltage
Defective Contacts in Contactor
Compressor Overload
Potential Relay
Run Capacitor
Start Capacitor
Faulty Wiring
Loose Terminals
Control Transformer
Low Voltage
Thermostat
Contactor Coil
Pressure Controls (High or Low)
Indoor Blower Relay
Discharge Line Hitting Inside of Shell
Bearings Defective
Seized
Valve Defective
Motor Wingings Defective
Refrigerant Charge Low
Refrigerant Overcharge
High Head Pressure
Low Head Pressure
High Suction Pressure
Low Suction Pressure
Non-Condensables
Unequalized Pressures
Solenoid Valve Stuck Closed (Htg)
Solenoid Valve Stuck Closed (Clg)
Solenoid Valve Stuck Open (Htg or Clg)
Leaking
Defective Valve or Coil
Plugged or Restricted Metering Device (Htg)
Scaled or Plugged Coil (Htg)
Scaled or Plugged Coil (CLg)
Water Volume Low (Htg)
Water Volume Low (Clg)
Low Water Temperature (Htg)
Plugged or Restricted Metering Device (Clg)
Fins Dirty or Plugged
Motor Winding Defective
Air Volume Low
Air Filters Dirty
Undersized or Restricted Ductwork
Auxillary Heat Upstream of Coil
Compressor Will Not Run
No Power at Contactor
Compressor Will Not Run
Power at Contactor
Compressor "Hums"
But Will Not Start
Compressor Cycles on Overload
Thermostat Check Light
Lite-Lockout Relay
Compressor Off on High
Pressure Control
Compressor Off on Low
Pressure Control
Compressor Noisy
Head Pressure Too High
Head Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
I.D. Blower Will Not Start
I.D. Coil Frosting or Icing
High Compressor Amps
Excessive Water Usage
Compressor Runs Continuously
– No Cooling
Liquid Refrigerant Flooding Back
To Compressor
Compressor Runs Continuously
– No Heating
Reversing Valve Does Not Shift
Liquid Refrigerant Flooding Back
To Compressor
Aux. Heat on I.D. Blower Off
Excessive Operation Costs
Ice in Water Coil
Heating Cycle
AUX.
Cooling
Cycle
Heating or Cooling Cycles
I
n
d
oor
Bl
ower
M
otor
and Coil
INDOOR SECTIONPOWER SUPPLY
W
ater
Solenoid
R
ev.
Valve Water Coil
WATER COIL SECTION
Line Voltage Control Circuit Compressor Refrigerant System
QUICK REFERENCE TROUBLESHOOTING CHART FOR WATER TO AIR HEAT PUMP
DENOTES COMMON CAUSE
DENOTES OCCASIONAL CAUSE