Friedrich R-410A service manual Problem

COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

Problem	Possible Cause	Action
	Sublimation:	Ensure that foam gaskets are installed in
	When unconditioned saturated,	between window panes & in between the
	outside air mixes with conditioned	unit & the sleeve. Also, ensure that fresh
	air, condensation forms on the	air/exhaust vents (on applicable models) are in
Water “spitting”	cooler surfaces	the closed position & are in tact
into room	Downward pitch of installation is	Follow installation instructions to ensure that
		downward pitch of installed unit is no less than
	too steep towards back of unit
		1/4” & no more than 3/8”
	Restricted coil or dirty filter	Clean & advise customer of periodic cleaning
		& maintenance needs of entire unit

Problem	Possible Cause	Action
	Insufficient air circulation thru area	Adjust louvers for best possible air circulation
	to be air conditioned
Excessive
	Oversized unit	Operate in “MoneySaver” position
moisture
	Inadequate vapor barrier in building	Advise customer
	structure, particularly floors

Problem	Possible Cause	Action
	Defective thermistor	Replace thermistor or electronic control board
	T-stat differential too narrow	Replace t-stat
T-stat or	Plenum gasket not sealing,	Check gasket. Reposition or replace as
thermistor	allowing discharge air to short
		needed
short cycles	cycle t-stat
	Restricted coil or dirty filter	Clean & advise customer of periodic cleaning
		& maintenance needs of entire unit

Problem	Possible Cause	Action
	Heat anticipator (resistor) wire
	disconnected at t-stat or system	Refer to appropriate wiring diagram
	switch
		Disconnect plus from outlet. Remove resistor
Prolonged off	Heat anticipator (resistor) shorted or	from bracket. Insert plug & depress “COOL”
cycles (automatic		& “FAN AUTOMATIC” buttons. Place t-stat to
	open
operation)		warmest setting. Feel resistor for temperature.
		If no heat, replace resistor
	Partial loss of charge in t-stat bulb	Replace t-stat
	causing a wide differential
	Defective thermistor	Replace thermistor or electronic control board

Problem	Possible Cause	Action
	Evaporator drain pan cracked or	Repair, clean or replace as required
	obstructed
	Water in compressor area	Detach shroud from pan & coil. Clean &
Outside water		remove old sealer. Reseal, reinstall & check
leaks	Obstructed condenser coil	Use pressure wash or biodegradable cleaning
		agent to clean
	Fan blade/slinger ring improperly	Adjust fan blade to 1/2” of condenser coil fin
	positioned	pack

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