Replace fuse, reset breaker. If repeats, check

Problem	Possible Cause	Action
		Replace fuse, reset breaker. If repeats, check
	Fuse blown or circuit tripped	fuse or breaker size. Check for shorts in unit
		wiring & components
Unit does not run	Power cord not plugged in	Plug it in
Unit does not run	System switch in "OFF" position	Set switch correctly
	System switch in "OFF" position	Set switch correctly
	Inoperative system switch	Test for continuity in each switch position
	Loose or disconnected wiring at switch or other	Check wiring & connections. Reconnect per
	components	wiring diagram

Problem	Possible Cause	Action
	Dirty ﬁlter	Clean as recommended in Owner's Manual
	Restricted airﬂow	Check for dirty or obstructed coil. Use pressure
	Restricted airﬂow	wash or biodegradable cleaning agent to clean
		wash or biodegradable cleaning agent to clean
Evaporator coil	Inoperative t-stat	Test for shorted t-stat or stuck contacts
Evaporator coil	Short of refrigerant	De-ice coil & check for leak
freezes up	Short of refrigerant	De-ice coil & check for leak
	Inoperative fan motor	Test fan motor & replace if inoperative
		De-ice coil. Check temp. differential (delta T)
	Partially restricted capillary tube	across coil. Touch test coil return bends for same
		temp. Test for low running current

Problem	Possible Cause	Action
	Excessive heat load	Unit undersized. Test cooling performance &
	Excessive heat load	replace with larger unit if needed
		replace with larger unit if needed
	Restriction in line	Check for partially iced coil & check temperature
	Restriction in line	split across coil
Compressor runs		split across coil
Compressor runs		Check for oil at silver soldered connections.
continually & does		Check for oil at silver soldered connections.
continually & does	Refrigerant leak	Check for partially iced coil. Check split across
not cycle off	Refrigerant leak	Check for partially iced coil. Check split across
not cycle off		coil. Check for low running amperage
		coil. Check for low running amperage
	T-stat contacts stuck	Check operation of t-stat. Replace if contacts
	T-stat contacts stuck	remain closed.
		remain closed.
	T-stat incorrectly wired	Refer to appropriate wiring diagram

Problem	Possible Cause	Action
	T-stat contacts stuck	Disconnect power to unit. Remove cover of t-stat
	T-stat contacts stuck	& check if contacts are stuck. If so, replace t-stat
		& check if contacts are stuck. If so, replace t-stat

T-stat does not turn	T-stat set at coldest point	Turn to higher temp. setting to see if unit cycles
unit off	T-stat set at coldest point	off
unit off		off
	Incorrect wiring	Refer to appropriate wiring diagrams
	Unit undersized for area to be cooled	Refer to industry standard sizing chart