Heat Controller RADS-51B manual Replace if open. If the compressor temperature is

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.
	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.)
Compressor cycles on	Voltage		Check the voltage. See the limits on the
overload.			preceding page. If voltage is not within these limits,
			call an electrician.
	Overload		Check overload, if externally mounted.
			Replace if open. (If the compressor temperature
			is high, remove the overload, cool, and retest.)
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