Bard MEGA-TEC W090A, Service Instructions Manual

Page: 116 / 159

Manual 2100-479
Page
11 of 11
Manual 2100-479
Page 11 of 11
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TROUBLESHOOTING
CHART
FOR
AIR
T
O
AIR
HEA
T
PUMPS
Power Failure
Blown Fuse or T ripped Breaker
Faulty Wiring
Loose T erminals
Low Voltage
Single 1PH Failure of 3PH
Unbalanced 3PH
Defective Contact s in Contactor
Compressor Overload
Potential Relay
Run Capacitor
Start Cap acitor
Faulty Wiring
Loose T erminals
Control Transfor mer
Low Voltage
Thermostat
Contactor Coil
Pre ssu re Con trol or Im ped anc e R ela y
Indoor Fan Relay
Discharge Line Hitting Inside of Shell
Bearings Defective
Seized
Valve Defective
Motor Windings Defective
Refrigerant Charge Low
Refrigerant Overcharge
High Head Pressure
Low Head Pressure
High Suction Pressure
Low Suction Pressure
Non-Condensables
Un eq ua liz ed P re ss ure s
Sensing Bulb Loose-Poorly Located
Cycle T oo Long (Clock timer)
Defective Control, T imer or Relay
Leaking
Defective Valve or Coil
Sticking Closed
Leaking or Defective
Plugged or Restricted Meter Device (Htg)
Fins Dirty or Plugged
Motor Winding Defective
Re cir cu la tio n o r A ir
Air Volume Low (Cooling)
Lo w T em pe ra tu re C oil A ir (C oo lin g)
Plugged or Restricted Metering Device (Clg)
Fins Dirty or Plugged
Motor Winding Defective
Air Vo lume Low
Air Filt ers Dir ty
Undersized or Restricted Ductwork
Sticking Closed
Leaking or Defective
Auxiliary Heat Upstream of Coil
y
Denotes common cause.
Š
Denotes occasional cause.
Cooling
Cycle
Heating or Cooling Cycles
Heating Cycle