Carrier 06D System noises, Compressor loses oil, Frosted suction line, Hot liquid line

PROBLEM	CAUSE	REMEDY
System noises.	Piping vibration.	Support piping as required, check for loose pipe
		connectors.
	Expansion valve hissing.	Add refrigerant, check for plugged liquid line
		strainer.
	Compressor noisy.	Check valve plates for valve noise, replace
		compressor (worn bearings), check for loose
		compressor holddown bolts.
	Insufficient compressor oil.	Add oil.
Compressor loses oil.	Leak in system.	Repair leak.
	Plugged or stuck compressor oil return	Repair or replace.
	check valve.
	Oil trapping in line.	Check piping for oil traps.
	Crankcase heaters not energized during	Replace heaters.
	shutdown.
Frosted suction line.	Expansion valve admitting excess	Adjust expansion valve.
	refrigerant.
Hot liquid line.	Shortage of refrigerant.	Repair leak and recharge.
Frosted liquid line.	Receiver shutoff valve partially closed or	Open valve or remove restriction.
	restricted.
	Restricted catchall.	Replace.
	Restricted strainer drier.	Replace.
Frosted expansion valve.	Ice plugging TXV orifice.	Apply hot wet cloth to TXV.
	Moisture indicated by increase in suction	Install drier.
	pressure.
	Plugged TXV strainer.	Clean strainer or replace TXV.
LEGEND

TXV — Thermostatic Expansion Valve

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