Heat Controller REG-71A, REG-123A Room Air Conditioner Voltage Limits, Complaint Cause Remedy

Troubleshooting Guide

Room AirConditioner VoltageLimits

NAME PLATE RATING		MINIMUM			MAXIMUM
208~230±10%		187V			253V
115±10%		104V			126V
COMPLAINT	CAUSE			REMEDY
Fan motor will not run.	No power		Check voltage at outlet. Correct if necessary.
	Power supply cord		Check voltage to rotary switch. If none, check power
			supply cord. Replace cord if circuit is open.
	Rotary switch		Check switch continuity. Refer to wiring diagram for
			terminal identification. Replace switch if defective.
	Wire disconnected or con-		Connect wire. Refer to wiring diagram for terminal
	nection loose		identification. Repair or replace loose terminal.
	Capacitor (Discharge		Test capacitor.
	capacitor before testing.)		Replace if not within ±10% of manufacturer's rating.
			Replace if shorted, open, or damaged.
	Will not rotate		Fan blade hitting shroud or blower wheel hitting
			scroll. Realign assembly.
			Units using slinger ring for condenser fan must have
			1/4 to 5/16 inch clearance to the base. If it hits the
			base, shim up the bottom of the fan motor with
			mounting screw(s).
			Check fan motor bearings; if motor shaft will not
			rotate, replace the motor.
Fan motor runs	Revolves on overload.		Check voltage. If not within limits, call an electrician.
intermittently			Test capacitor.
			Check bearings. Does the fan blade rotate freely?
			If not, replace fan motor.
			Pay attention to any change from high speed to
			low speed. If the speed does not change, replace the
			motor.
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 clamper		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.
but fan motor runs.			If not within limits, call an electrician.
	Wiring		Check the wire connections, if loose, repair or
			replace the terminal. If wires are off, refer to wiring
			diagram for identification, and replace. Check wire
			locations. If not per wiring diagram, correct.
	Rotary		Check for continuity, refer to the wiring diagram for
			terminal identification. Replace the switch if circuit is
			open.

26Room Air Conditioner