QUICK REFERENCE TROUBLESHOOTING CHART FOR WATER TO AIR HEAT PUMP
AUX. | Heat Gen. |
INDOOR SECTION | ndoor Blower Motor and Coil |
| I |
| Water Coil |
| Rev. Valve |
SECTION | Water Solenoid |
WATER COIL | Refrigerant System |
| Compressor |
| Control Circuit |
POWER SUPPLY |
|
| Line Voltage |
|
|
Coil of Upstream Heat Auxillary
Ductwork Restricted or Undersized
Dirty Filters Air
Low Volume Air
Defective Winding Motor
Plugged or Dirty Fins
(Clg) Device Metering Restricted or Plugged
(Htg) Temperature Water Low
(Clg) Low Volume Water
(Htg) Low Volume Water
(CLg) Coil Plugged or Scaled
(Htg) Coil Plugged or Scaled
(Htg) Device Metering Restricted or Plugged
Coil or Valve Defective
Leaking
Clg) or (Htg Open Stuck Valve Solenoid
(Clg) Closed Stuck Valve Solenoid
(Htg) Closed Stuck Valve Solenoid
Pressures Unequalized
Pressure Suction Low
Pressure Suction High
Pressure Head Low
Pressure Head High
Overcharge Refrigerant
Low Charge Refrigerant
Defective Wingings Motor
Defective Valve
Seized
Defective Bearings
Shell of Inside Hitting Line Discharge
Relay Blower Indoor
Low) or (High Controls Pressure
Coil Contactor
Thermostat
Voltage Low
Transformer Control
Terminals Loose
Wiring Faulty
Capacitor Start
Capacitor Run
Relay Potential
Overload Compressor
Contactor in Contacts Defective
Voltage Low
Terminals Loose
Wiring Faulty
Breaker Tripped or Fuse Blown
Failure Power
COMMON CAUSE | OCCASIONAL CAUSE |
DENOTES | DENOTES |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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 | 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 |
|
|
|
|
|
| Cycles Cooling or Heating |
|
|
|
|
| Cycle |
|
| Cycle Heating |
| ||||||||
|
|
|
|
|
|
|
|
|
|
| Cooling |
|
|
| ||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Manual | |
Page | 44 of 46 |