Haier HC42D2VAR, HC36D2VAR, HC30D2VAR, HC24D2VAR, HC18D2VAR operation manual Vapor pressures

Symptom	Possible Cause	Remedy
	Power off or loose electrical connection	Make sure main switch is ON. Check and tighten all connections.
	Incorrect thermostat setting	Set thermostat correctly
No cooling	Defective contactor	Check for 24V at contactor coil.
	Open circuit breaker of blown fuses	Reset or replace
	Defective transformer	Check wiring - Replace it.
	Interconnecting low voltage wiring damage	Replace thermostat wiring
	Dirty filters	Clean & replace
	Indoor air blockage	Check supply registers and return grills for blockage.
	Blocked outdoor coil	Clear away leaves and other debris
	Improperly sized unit	Recalculate load
Insufficient Cooling	Improper airflow	Check - should be 400CFM/Ton
	Incorrect refrigerant charge	Charge correctly per instruction.
	Air, non-condensibles or moisture in system	Recover refrigerant, evacuate & recharge, add filter drier
	Incorrect voltage	At compressor terminals, voltage must be within
		10% of rating plate volts when unit is running.
Water on floor or in
furnace	Blocked condensate drain and "P" trap	Remove blockage
	Run or start capacitor defective	Replace
	Loose connection	Check and tighten all connections.
Condenser fan runs,	Compressor stuck, grounded or open	Wait for 2 hours for overload to reset.
compressor doesn't	motor winding, open internal overload	Replace compressor if still open.
	Low voltage condition	At compressor terminals, voltage must be within 10% of rating
		plate volts when unit is running.
	Low voltage condition	Add start kit components
	Incorrect voltage	At compressor terminals, voltage must be within 10% of rating
Compressor		plate volts when unit is running.
short-cycling	Defective overload protector	Replace - check for correct voltage
	Refrigerant undercharge	Add refrigerant
Register sweat	Low evaporator airflow	Increase blower speed or reduce restriction - replace air filter
	Restriction in liquid line,	Replace defective components
High head - Low	metering device or filter drier
vapor pressures	Flowrator piston size too small	Change to correct size piston
	Incorrect capillary tubes	Change coil assembly
	Blocked outdoor coil	Clear away leaves and other debris
High head - High	Refrigerant overcharge	Correct system charge
or normal vapor	Condenser fan not running	Repair or replace
pressures	Air, non-condensibles or	Recover refrigerant, evacuate &
	moisture in system	recharge, add filter drier
Low head - High	Flowrator piston size too large	Change to correct size piston
vapor pressures	Defective compressor valves	Replace compressor
	Incorrect capillary tubes	Replace coil assembly
Low vapor - cool	Low evaporator airflow	Increase blower speed or reduce restriction - replace air filter
compressor - iced	Operating below 65 F outdoors	Add low ambient kit
evaporator coil	Moisture in the system	Recover refrigerant, evacuate & recharge, add filter drier
High vapor	Excessive load	Recheck load calculation
pressure	Defective compressor	Replace
Fluctuating head	Air or non-condensibles in system	Recover refrigerant, evacuate & recharge.
and vapor pressures
Pulsing noise at	Air or non-condensibles in system	Recover refrigerant, evacuate & recharge
metering device
or liquid line

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