Friedrich racservmn Troubleshooting: Heating Cooling/Electric Models, Problem, Possible Cause

Troubleshooting: Heating (Cooling/Electric Models)

PROBLEM	POSSIBLE CAUSE	TO CORRECT
	Heater relay or contactor coil open.	Check continuity of coil.
Fan Operates –	Heater relay or contactor stuck open,	Inspect, test continuity with ohmmeter.
	pitted or burned.
heating element does	High limit control open.	Check continuity – if open, replace.
not come on.	Open thermal fuse.	Check continuity. Check reason for failure.
	Open or shorted element.	Check voltage across heater terminals. Check
		amperage draw of heater.
	Loose connections.	Tighten all terminals.

PROBLEM	POSSIBLE CAUSE	TO CORRECT
	Restricted filter.	Clean as recommended in Owner’s Manual.
Heating inadequate.	Cycling high limit control.	Control is set to open at 155°F ± 5°F and close at
		130°F ± 8°F. If cycling prematurely, replace control.
	Exhaust or fresh air door open.	Check position of fresh air door control slide. Adjust
		cable if door does not close properly.

PROBLEM	POSSIBLE CAUSE	TO CORRECT
	Fan relay contacts open.	Check continuity of fan relay. NOTE: Some models
Fan operates in "Con-		have the fan relay energized during the heating
stant" position, but not in		cycle while others do not.
"Automatic" (Money-	Inoperative system switch.	Check continuity between terminals "L2" and "3" of
Saver).		the system switch.
	Loose connection.	Check connections on system switch and fan relay.

PROBLEM	POSSIBLE CAUSE	TO CORRECT
	Heat anticipator (resistor) shorted.	Disconnect power to unit. Remove resistor from
Long "off" and "on"		thermostat bulb block. Plug in unit and allow to
		operate. Feel resistor for heat. If no heat is felt,
cycles.
		replace resistor.
	Defective thermostat.	Replace thermostat and check operation.

PROBLEM	POSSIBLE CAUSE	TO CORRECT
Fan motor does not	Defective motor.	Check and replace.
	Open or shorted capacitor.	Replace capacitor and check.
operate in "Constant"
	Condenser fan frozen to base pan.	Check if drain pan valve is open. If not, replace.
or "MoneySaver"
	Loose connections.	Check all connections. Check voltage to fan motor.
position.

PROBLEM	POSSIBLE CAUSE	TO CORRECT
	Heating capillary tube partially restricted.	Check for partially starved outer coil. Replace
		heating capillary tube.
Cooling adequate,	Check valve leaking internally.	Switch unit several times from heating to cooling.
		Check temperature rise across coil. Refer to specifi-
heating insufficient.
		cation sheet for correct temperature rise.
	Reversing valve failing to shift	Deenergize solenoid coil, raise head pressure,
		energize solenoid to break loose. If valve fails to
	completely – bypassing hot gas.
		make complete shift, replace valve.

43