YORK INTERNATIONAL
64
(YCHA120-200)
PROBLEM CAUSE SOLUTION
F1 or F5 Fault Code 1. External High Pressure Switch 1. Check External High Pressure Switch and
Faults on Motor Current. tripped related problems in “Cuts-out on High
Motor Contactor May or Discharge Pressure” section (F4 or F8
may not Energize Fault Code)
2. External Motor Overload tripped. 2. Check for defective External Motor
Overload, wiring, & motor problems
3. Improper System High Voltage 3. Check System High Voltage Supply
Supply.
4. Defective motor 4. Check motor
5. FauIty wiring single phasing 5. Check wiring
6. Motor Current Board defective 6. Replace Motor Current Board (Contact
the local YORK service representative.)
7. Defective Current Transformer 7. Replace defective Current Transformer
8. Defective 13FU or 120VAC power 8. Check fuse (13FU) & wiring
missing from Relay Output Board
and motor contactors.
9. Defective Motor Contactor or 9. Replace Contactor or Auxiliary
Auxiliary contacts Contacts
10. Defective Relay Output Board 10. Replace Relay Output Board (Contact
the local YORK service representative.
F2 or F6 Fault Code 1. Low Oil Charge 1. Oil level should be visible in either sight
Low Oil Pressure Fault glass at all times. Add YORK “C” oil
if necessary.
2. Too much refrigerant in oil, 2. Check Crankcase Oil heater operation.
particularly on start-up. (350 Watt heater should be “ON” when
unit is “OFF”.) Measure Heater Current.
(Should be Min. 2 Amps.)
3. Liquid Line Solenoid Valve (LLSV) 3. Check wiring & LLSV
not opening.
4. Suction Press. Transducer defective 4. Replace Transducer
5. Oil Press. Transducer defective 5. Replace Transducer
Follow steps listed under GENERAL above to verify cutout point (44 PSIG), (or as appropriate for brine).
F3 or F7 Fault Code 1. Low Refrig. Charge 1. Repair Leak/Add Refrig.
Faults on Low Pressure 2. Fouled Filter Drier 2. Change Drier Core
3. Thermal Expansion Valve Failure 3. Adjust Compressor Suction Superheat
to 11°F or Replace Power Element
(or Valve)
4. Reduced Flow of Chilled 4. Check GPM (See OPERATING LIM-
Liquid through Cooler ITATIONS, page 3) Check operation of
pump. Clean Pump Strainer, Purge
Chilled Liquid System of air
5. Check LP Cutout Point on Panel 5. See manual for adjustment procedure
6. Defective Suction Press. Transducer 6. Replace Transducer
7. Fouled Compressor Suction Strainer 7. Remove & Clean Strainer
8. LLSV not opening 8. Check Wiring & LLSV
9. Faulty wiring to Transducer 9. Check wiring
10. Defective Relay Output Board 10. Replace Relay Output Board (Contact
the local YORK service representative.)
11. Defective Analog Input Board 11. Replace Analog Input Board (Contact
the local YORK service representative.)
12. Defective Micro Board 12. Replace Micro Board (Contact the
local YORK service representative.)
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