Troubleshooting Guide

		Troubleshooting Guide


COMPLAINT	CAUSE	REMEDY

Fan motor noise.	Fan	If cracked, out of balance, or partially missing,
		replace it.

	Blower	If cracked, out of balance, or partially missing,
		replace it.

	Loose set screw	Tighten it.

	Worn bearings	If knocking sounds continue when running or
		loose, replace the motor. If the motor hums or
		noise appears to be internal while running,
		replace motor.

Compressor will not run,	Voltage	Check voltage. See the limits on the preceding
fan motor runs.		page. If not within limits, call an electrician.

	Wiring	Check the wire connections; if loose, repair or
		replace the terminal. If the wires are discon-
		nected, refer to wiring diagram for identification,
		and replace the wires. Check the wire connections;
		If not according to the wiring diagram, correct
		the connections.

	Thermistor	Check the TEMP control. If not at the lowest
		number, set TEMP control to this setting and
		restart the unit.

		Check the continuity of the thermistor. Replace
		the thermistor if the circuit is open.

	Rotary	Check for continuity, refer to the wiring diagram
		for terminal identification. Replace the switch if
		the circuit is open.

	Thermostat	Check the position of knob. If not at the coldest
		setting, advance the knob to this setting and
		restart the unit.

		Check the continuity of the thermostat. Replace
		the thermostat if the circuit is open.

	Capacitor (discharge	Check the capacitor.
	capacitor before	Replace if not within ±10% of manufacturer’s
	servicing.)	rating, replace if shorted, open, or damaged.

	Compressor	Check the compressor for open circuit or
		ground. If open or grounded, replace the
		compressor.

	Overload	Check the compressor overload if externally mounted.
		Replace if open. (If the compressor temperature is
		high, remove the overload, cool, and retest.)

Service Manual 35

COMPLAINT