Friedrich SH15L30-A manual Troubleshooting Problem Possible Cause To Correct, Unit does not RUN

TROUBLESHOOTING

PROBLEM	POSSIBLE CAUSE	TO CORRECT
	Power disconnected.	Check power source.
	System switch in “Off”	Set switch correctly.
	position.
	Branch circuit fuse blown or	Replace fuse, reset breaker. If repeats, check fuse
		or breaker size. Check for shorts in unit wiring and
UNIT DOES NOT RUN.	circuit breaker tripped.
		components.
	Inoperative system switch.	Test for continuity.
	Loose or disconnected wiring	Check wiring and connections.
	at switch.	Connect per wiring diagram.
	Inoperative switch (On-Off).	Test for continuity, 3 and 2, 5 and 6.
	Dirty Filter.	Clean as recommended in Owner’s Manual.
	Restricted air flow.	Check for dirty or obstructed coil - clean as required.
	Inoperative thermostat.	Test for shorted thermostat or stuck contacts.
EVAPORATOR COIL	Short of refrigerant.	De-ice coil and check for leak.
FREEZES UP.
		De-ice coil. Check temperature differential across coil.
	Partially restricted capillary.	Touch test coil return bends for same temperature. Test for
		low running current.
	Inoperative fan motor.	Test and replace if inoperative.
	Excessive heat load.	Test cooling performance of unit. Unit undersized.
COMPRESSOR RUNS	Restriction in line.	Check for partially iced coil. Check temperature split
		across coil.
CONTINUALLY.		Check for presence of oil on silver soldered connections.
DOES NOT CYCLE	Refrigerant leak.	Check for partially iced coil. Check split across coil.
OFF.		Check for low running amperage.
	Thermostat contacts stuck.	Check operation of thermostat. Replace if contacts
		remain closed.
	Loss of charge in thermostat	Place jumper across thermostat terminals. If unit
	bulb.	operates, replace thermostat.
THERMOSTAT DOES	Loose or broken parts in	Check as above.
NOT TURN UNIT ON.	thermostat.
	Incorrect wiring.	Connect per wiring diagram.
	System switch open.	Test for continuity at switch terminals 2 and 3.
	Thermostat set at coldest	Turn to highest temperature setting to see of unit will cycle
	point	off.
THERMOSTAT DOES	Thermostat contacts stuck.	Disconnect power to the unit. Remove cover of thermostat
NOT TURN UNIT OFF.		and check if contact is stuck, if so replace thermostat.
	Switch (On - Off) shorted.	Test switch for open contacts at terminals 2 and 3 with
		switch in “Off” position.

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