York YCAS0130 manual Troubleshooting Guide

Troubleshooting

FORM 201.19-NM1 (204)

TROUBLESHOOTING GUIDE

PROBLEM	POSSIBLE CAUSE	ACTION POSSIBLE CAUSE	ACTION
No display on panel -	Main supply to control system OFF.	Switch on main supply if safe to do so.
unit will not start		Check if control panel emergency stop switch
	Emergency stop device off.	and any remote emergency stop devices are in
		the OFF position. Turn to ON position (1) if safe
		to do so.
	CB3 tripped.	Check CB3.
	No supply to - T2.	Check 115VAC to L & 2.
	No 24VAC supply to power board.	Check wiring from - T2 to powerboard and fuse.
	No +12V output from powerboard.	Replace powerboard or isolate excessive load on
		the board.
NO RUN PERM displayed	No liquid flow through the evaporator.	Ensure that liquid pumps are running. Valves are
(No run permissive)		correctly set and flow is established.
		Check that the flow switch is functional and is
	Flow switch or cycling contacts are
		installed according to the manufacturer’s instructions.
	Flow switch contacts are not made.
	not made.	Check cycling contacts.
SYS # HIGH OIL TEMP	Poor airflow through the condenser	Check for airflow restrictions caused by blockages on
	coils.	intake faces of air coils.
	Measured temperature incorrect.	Check oil temp sensor and wiring.
Chiller FAULT: LOW	Ambient air temperature is lower	Use the ‘ambient temp.’ key to display the
AMBIENT TEMP displayed	than the programmed operating	temperature and confirm that the displayed value is
	limit.	approximately correct. The warning message should
		clear when the ambient air temperature rises above
		the programmed operating limit.
		Check the programmed settings are correct for the
		options fitted to the unit.
	Measured temperature is incorrect.	Check ambient sensor and wiring.
Chiller FAULT: HIGH	Ambient air temperature is higher	Use the ‘ambient temp.’ key to display the
AMBIENT TEMP displayed	than the programmed operating limit.	temperature and confirm that the displayed value is
		approximately correct. The warning message should
		clear when the ambient air temperature falls below
		the programmed operating limit.
		Check that the programmed settings are correct for
		the options fitted to the unit.
	RecirculatedResid. heat airis notis affectingbeing dissipatedthe sensor. .	Check fans are operating correctly and the rotation is
		correct. Check for airflow recirculation.
	Measured temperature is incorrect.	Check ambient sensor and wiring.
Chiller FAULT: LOW	Leaving liquid drops below the	Check for restrictions in the liquid flow line.
WATER TEMP displayed	programmed low limit faster than the	Check that the liquid flow is stable.
	unit can unload.
	Unit is not unloading.	Check the voltage to the unloader valve solenoid.
		Check that the compressor unloads correctly.
	Measured temperature is incorrect.	Check water temp sensor and wiring.
Chiller FAULT: VAC		Check main supply is stable and within allowable
UNDERVOLTAGE	Poor main supply voltage.	limits.
displayed.		Check for voltage dip on compressor start.

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