FORM 150.40-NM20
37
YORK INTERNATIONAL
(YCHA100)
PROBLEM CAUSE SOLUTION
Low Compressor Oil 1. Low Oil Charge 1. Oil level should be visible in either
Level (Particularly on sight glass at all times. Add YORK “C”
Start-Up) oil if necessary.
2. Excessive Flood back of Liquid 2. Adjust Thermal Expansion Valve (TXV)
Refrigerant or replace Power Element. Check TXV
Bulb Location. Should be located on
suction line at least 8"-10" from nearest
elbow. Bulb should be at 4 o’clock or
8 o’clock position, have good contact
with suction line & be well insulated
from surrounding air.
Crankcase Heater won’t 1. Open in 115VAC wiring to heater 1. Check wiring
Energize (should energize 2. Defective Heater 2. Replace Heater
anytime unit is “OFF”)
(Min. Current draw = 3. Auxiliary contacts of Compressor 3. Replace Contactor
2 amps) Motor Contactor defective.
Compressor won’t load 1. Suction Pressure > 105 PSIG 1. Excessive load. Check OPERATING
(solenoid valve de-energizes LIMITATIONS on page 3. Allow unit to
to load compressor) operate until suction procedure drops
to 95 PSIG.
2. Discharge Pressure > 390 PSIG 2. Check OPERATING LIMITATIONS on
page 3. Will reload @ 330 PSIG.
3. Demand not great enough 3. OK
4. Defective Loading Solenoid 4. Replace Compressor Loading Solenoid
5. Faulty Wiring to loading Solenoid 5. Check Wiring
6. Defective Water Temp. Sensor 6. Replace appropriate Sensor (LWT or RWT)
(See chart under F11 Fault Code)
7. Defective Evaporator Transducer 7. Replace Transducer
8. Relay Output Board Defective 8. Replace Relay Output Board (Contact the
local YORK service representative.)
9. Defective Micro Board 9. Replace Micro Board (Contact the
local YORK service representative.)
Lack of Cooling Effect 1. Fouled Evaporator Surface 1. Contact the local YORK Service Rep.
2. Faulty Compr. Suction and/or 2. Contact the local YORK Service Rep.
Discharge Valves
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