Friedrich R-410A service manual Fused separately

COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

Problem	Possible Cause	Action
	Overload inoperative. Opens too	Check operation of unit. Replace overload if
	soon	system operation is satisfactory
	Compressor restarted before	Allow a minimum of 2 minutes to allow
		pressures to equalize before attempting to
	system pressures equalized
		restart. Instruct customer of waiting period
		Check voltage with unit operating. Check for
Compressor runs	Low or fluctuating voltage	other appliances on circuit. Air conditioner
		should be in separate circuit for proper voltage
for short periods
only. Cycles on		& fused separately
overload	Incorrect wiring	Refer to appropriate wiring diagram
	Shorted or incorrect capacitor	Check by substituting a known good capacitor
		of correct rating or test cap
	Restricted or low air flow through	Check for proper fan speed or blocked
	condenser coil or evaporator coil	coils
	Compressor running abnormally	Check for kinked discharge line or restricted
	hot	condenser. Check amperage

Problem	Possible Cause	Action
	Loss of charge in t-stat bulb	Place jumper across t-stat terminals to check if
		unit operates. If unit operates, replace t-stat.
T-stat does not
	Loose or broken parts in t-stat	Check as above
turn unit on
	Incorrect wiring	Refer to appropriate wiring diagram
	Defective thermistor	Replace thermistor or electronic control board

Problem	Possible Cause	Action
	Poorly installed	Refer to Installation Manual for proper
		installation
	Fan blade striking chassis	Reposition - adjust motor mount
Noisy operation		Check that compressor grommets have not
	Compressor vibrating	deteriorated. Check that compressor mounting
		parts are not missing
	Improperly mounted or loose	Check assembly & parts for looseness,
	cabinet parts refrigerant tubes	rubbing & rattling. Correct as needed

Problem	Possible Cause	Action
	Evaporator drain pan overflowing	Clean obstructed drain trough
	Condensation forming underneath	Evaporator drain pan broken or cracked.
		Reseal or replace. No chassis gasket installed.
	base pan
		Install chassis gasket
	Poor installation resulting in rain	Check installation instructions. Reseal as
Water leaks into	entering the room	required
		Dirty evaporator coil. Use pressure wash
the room	Condensation on discharge grille
		or biodegradable cleaning agent to clean.
	louvers	Environmental phenomena: point supply
		louvers upward
	Chassis gasket not installed	Install gasket, per Installation manual
	Downward slope of unit is too	Refer to installation manual for proper
	steep inward	installation

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