York YCH120 - Page 65

FORM 150.40-NM20
65
YORK INTERNATIONAL
PROBLEM CAUSE SOLUTION
F4 or F8 Fault Code 1. Condenser fans not operating 1. Check fans, Fuses, and Contactors.
Cuts out on High Discharge or rotating backwards. Air flow must “UP”.
Pressure as sensed 2. Too much Refrigerant 2. Remove Refrigerant
by Microprocessor via 3. Air in Refrigerant System 3. Evacuate and recharge
high discharge pressure 4. Defective Discharge Press. Transducer 4. Replace Discharge Press. Transducer
transducer.
NOTE: If external H.P. 5. Defective Relay Output Board 5. Replace Relay Output Board (Contact
Cut-out Switch trips the local YORK service representative.)
the Fault Code will be
an F1 or F5. 6. Defective Analog Input Board 6. Replace Analog Input Board (Contact
the local YORK service representative.)
F9 Fault Code 1. Temperature sensed incorrectly 1. Verify actual ambient temperature
Cuts out on high ambient by thermistor at probe
temperature. (Max. = 130°F 2. Fans Rotating Backwards 2. Air flow must be up. Correct fan
Will re-start automatically rotation.
if temperature drops
below 130°F) 3. Air flow to unit restricted (or 3. Check installation clearances. (See
being re-circulated). page 5)
F10 Fault Code 1. Temperature sensed incorrectly 1. Verify actual ambient temperature
Cuts out on Low Ambient by thermistor. at probe.
Temperature (35°F min. 2. Check Low Ambient Temp. Cut-out 2. Adjust if necessary.
for Std. Unit. 0°F min. setting on the display (Display Code 7)
for Low Ambient Unit.)
NOTE: Operation below
35°F required Low
Ambient Accessory.
Follow steps listed under GENERAL above to verify cutout setpoint and actual cutout reading.
Factory Setting = 36°F (or as appropriate for brine.)
F11 Fault Code 1. Check LWT Cutout Point on Panel 1. Adjust if necessary, and restart unit.
Low Water 2. Defective LWT or RWT sensor. 2. Check according to following table
Temperature Shutdown (use digital volt meter)* Replace if
necessary.
Temp. °F Voltage - (DC)
30.9 1.67
33.6 1.79
36.3 1.91
38.9 2.03
41.4 2.15
43.9 2.28
46.3 2.40
48.6 2.52
50.8 2.64
53.0 2.76
55.1 2.89
57.2 3.01
59.3 3.13
61.3 3.25
63.2 3.37
*Check voltage on Analog Input Board
LWT: J20-1 to J20-3
RWT: J21-1 to J21-3
(YCHA120-200)