Goodman Mfg IO-402G Troubleshooting Analysis Table, Wiring Diagram, Complaint, Probable Cause

TROUBLESHOOTING ANALYSIS TABLE

COMPLAINT		PROBABLE CAUSE		REMEDY
	1.	Excessive charge of refrigerant in system.	1.	Purge or pump-down excessive charge.
	2.	Inadequate supply of air across the	2.	Make certain that coil is not fouled in any
1. High Head Pressure		condenser coil.		way, or that air is not re-circulating.
	3.	Non-condensate gases in the system.	3.	Purge these gases from the system.
				Recharge system, if necessary.
2. Low Head Pressure	1.	System low on refrigerant.	1.	Charge system until sight glass is clear of bubbles.
	2.	Compressor valves broken.	2.	Replace compressor.
	1.	Liquid line valve closed.	1.	Open the liquid line valve.
	2.	Restricted liquid line.	2.	Replace filter-dryer.
	3.	The bulb of the thermal expansion valve	3.	Detach the bulb from the suction line and hold
		has lost its charge.		in one hand. If no liquid refrigerant goes through
				the valve, replace the valve.
3. Low Suction Pressure	4. System low on refrigerant.		4.	Test the unit for leaks. Add refrigerant until sight
				glass is free from bubbles, after repairing leak.
	5.	Dirty filters.	5.	Clean or replace filter.
	6.	Coil frosted up.	6.	Defrost and clean coil. Clean or replace filters.
	7.	Flash gas in the liquid line.	7.	Excessive liquid line drop. Check liquid line size.
	8.	Quantity of air through evaporator not adequate.	8.	Increase the blower speed.
	1.	Expansion valve stuck open.	1.	Correct valve action or replace the valve.
4. High Suction Pressure	2.	Expansion valve bulb not in contact with	2.	Fasten bulb securely to suction line.
		suction line.
	3.	Suction and/or discharge valve leaking or broken.	3.	Replace compressor.
	1.	Disconnect switch open.	1.	Close the disconnect switch.
	2.	Blow fuse or fuse at disconnect switch.	2.	Check the cause of failure and replace the fuse.
	3.	Thermostat set too high.	3.	Adjust to lower temperature.
5. Compressor will not start.	4. Selector switch in "Off" position.		4.	Turn selector switch knob to "Cool" position.
	5.	Contactor and/or relay coils burned out.	5.	Replace contactor and/or relay.
	6.	Loose or open electrical connection in either	6.	Inspect and secure all electrical connections.
		the control or power circuit.

Wiring Diagram

HIGH VOLTAGE!

DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT.

MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY

CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

8