FORM 150.40-NM20
35
YORK INTERNATIONAL
(YCHA100)
PROBLEM CAUSE SOLUTION
F1 Fault Code 1. External High Pressure 1. Check External High Pressure switch
Faults on motor current. Switch tripped and related problems in “Cuts-out on
Motor Contactor May or High Discharge Pressure” section (F4
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. Faulty 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 Contact or 9. Replace Contactor or Auxiliary Contacts
Auxiliary Contacts
10. Defective Relay Output Board 10. Replace Relay Output Board (Contact
the local YORK service representative.)
F2 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 and 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 cut-out point (44 PSIG), (or as appropriate for brine).
F3 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 110°F or Replace Power Element
(or Valve)
4. Reduced Flow of Chilled Liquid 4. Check GPM (See OPERATING LIM-
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 Suct. 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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