(09/03)
8
-
2
035B09012-100 Rev. 4
Fault
Probable Cause
Remedy
Gas leakage.
Identify and eliminate leakage.
Insufficient charge.
Top up charge.
Pressure switch failure.
Replace pressure switch.
High pressure switch malfunction.
Check switch operation, replacing if necessary.
Delivery valve partially closed.
Open valve, replacing if necessary.
Non-condensables in circuit.
Purge circuit.
Condenser fan(s) inoperative.
Check wiring and motors. Repair or replace if
necessary.
Liquid line too hot.
Insufficient charge.
Identify and eliminate causes of charge loss and
top up charge.
Liquid line valve partially closed.
Check that all valves are open.
Receiver/drier clogged.
Replace cartridge.
Electrical circuit problems.
Check connections.
Internal thermal cut-out activated.
Call an Authorised York Service Centre.
Compressor failure.
Call an Authorised York Service Centre.
Dirt in evaporator water circuit.
Chemically clean evaporator water circuit.
Condenser coil clogged.
Clean condenser coil.
Low refrigerant charge.
Top up charge.
No power supply.
Check main switch and auxiliary fuses.
Heater open circuit.
Check heater, replacing if necessary.
Incorrect thermostat setting.
Check temperature setting on control panel.
Incorrect temperature differential across
evaporator inlet and outlet.
Check water flow and water circuit fluid quantity.
Electronic control system malfunction.
Call an Authorised York Service Centre.
Air in circuit
Vent air using bleed valves.
Deposits or impurities in the evaporator.
Wash evaporator using reverse flow.
Water circulation fault.
Check pump.
Flow switch inoperative.
Check flow switch.
Differential flow switch inoperative.
Check differential flow switch.
Low pressure switch cuts
in, braking circuit.
High pressure switch cuts
in, braking circuit.
Poor/No water temperature
control.
Poor water ciculation.
Unit does not operate, flow
alarm activated.
Liquid line freezes.
Fans do not rotate.
Reduced cooling or heating
capacity.
Evaporator heater does not
work.
Summary of Contents for YCAA B 120
Page 2: ......
Page 16: ...This Page Left Intentionally Blank 09 03 2 6 035B09012 100 Rev 4 ...
Page 28: ...This Page Left Intentionally Blank 09 03 4 10 035B09012 100 Rev 4 ...
Page 36: ...Page Left Intentionally Blank 09 03 6 6 035B09012 100 Rev 4 ...
Page 40: ...Page Left Intentionally Blank 09 03 7 4 035B09012 100 Rev 4 ...
Page 68: ...Notes 09 03 11 2 035B09012 100 Rev 4 ...
Page 69: ...Notes 09 03 035B09012 100 Rev 4 11 3 ...