Friedrich 2007 service manual Replace fuse, reset breaker. If repeats, check

COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

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
	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
		wash or biodegradable cleaning agent to clean
Evaporator coil	Inoperative t-stat	Test for shorted t-stat or stuck contacts
	Short of refrigerant	De-ice coil & check for leak
freezes up
	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 &
		replace with larger unit if needed
	Restriction in line	Check for partially iced coil & check temperature
		split across coil
Compressor runs
		Check for oil at silver soldered connections.
continually & does
	Refrigerant leak	Check for partially iced coil. Check split across
not cycle off
		coil. Check for low running amperage
	T-stat contacts stuck	Check operation of t-stat. Replace if contacts
		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
		& 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		off
	Incorrect wiring	Refer to appropriate wiring diagrams
	Unit undersized for area to be cooled	Refer to industry standard sizing chart

18