Friedrich CP14N10, CP18N30, CP24N30 manual Replace fuse, reset breaker. If repeats, check fuse

Cooling Only Room Air Conditioners: Troubleshooting Tips

Problem		Possible Cause	Action
			Replace fuse, reset breaker. If repeats, check fuse
	Fuse blown or circuit tripped		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 wiring
	components		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) across
	Partially restricted capillary tube	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. Check
continually & does not
	Refrigerant leak	for partially iced coil. Check split across coil. Check
cycle off		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 off
unit off
	Incorrect wiring	Refer to appropriate wiring diagrams
	Unit undersized for area to be cooled	Refer to industry standard sizing chart

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