23
TROUBLESHOOTING

SeeTable 12 and Table13 for troubleshootinginformation.

FaultCode

Oncea failure occurswith the indoor unit in operation, the greenLED onthe indoor unit flashes at intervalsof 0.5 seconds.The fault code is

deducedfrom the number of times the green LED flashes,blocking unit operation. Betweenone flash cycle and the nextone, a pause of 3

secondselapses.

Table12 – Green LED (Indoor UnitFault)

CODE DESCRIPTION
3RoomAirSensorFault
4IndoorUnit C oilSen sor Fault
14 OutdoorUnitAirSensorFault

Table13 – Troubleshooting

PROBLEM POSSIBLE CAUSE SOLUTION
Compressorand Fan of the Outdoor
UnitWill Not Start
Unitnot energized Checkthe main power connection.
Mainswit ch isset to OFF CheckandputittoONposition.
Mainswit ch fuses are blown Replacef uses.
Compressorcycling protection is on Waitfor 3 minutes.
Mainpo wer voltage is too l ow Checkand set to the correctvoltage.
Electricalconnections are too loose or are wrong Checkand tighten or correctconnections.
CompressorWill Not Start, But Out-
doorFan is Operating
Electrical connections of compressor are loose or
wrong Check and tighten or repair compressor.
Compressor Stops Dueto Over---te m-
perature
Compressorburnt out; seized or protection device
on
Checkfor the cause and replace compressor if neces-
sary.
Wrongrefrigerant chargein unit (excessive or low)
orair or other non---condensablegassesin the
circuit
Drainrefrigerant, evacuate and recharge.CAUTION: Do
notvent refrigerant to the atmosphere; use refrigerant
recoveryequipment.
Mainvoltage is too high or too low Checkvol tage setting and adjust if necessary.
Condensercoil obstructed Removeobstr uction.
Outdoor fan off Checkcause and resume operation or repair.
Wrongindoor unit thermistors Replacethermistors.
Refrigerant circuit clogge d Check and remove obstructions.
Reversingvalve faulty on hea t pump models Replacereversing valve.
Expansiondevice clogged or covered with ice
Drainrefrigerant, evacuate and recharge.CAUTION: Do
notvent refrigerant to the atmosphere; use refrigerant
recoveryequipment.
Compressor Runs Continuously
Unitse lected is too small f or application requ ire-
ments
Contacta qualified service technicianfor a system evalu-
ation.
Indoortemper ature setting too low or too high Checktempe rature setting.
Outdoorunit fan faulty Replaceou tdoor fan.
Airor other non---condensablegassesin the cir-
cuit
Drainrefrigerant, evacuate and recharge.CAUTION: Do
notvent refrigerant to the atmosphere; use refrigerant
recoveryequipment.
Obstructions at air intake or dirty indoo r unit filters Removeobstructionand/orclean filter.
Fre que n t Ic e ---B u i l d --- Up on Out d o or
Coil Outdoorfa n is stopped Checkcauseand repair.
DischargePressure Too High
Outdoorcoil dirty or obstructed Cleanor remove obstructions.
Condenserfan faulty Replacecondenser fan.
Indoortemper ature setting too low or too high Checktempe rature setting.
Airor other non---condensablegassesin the cir-
cuit
Drainrefrigerant, evacuate and recharge.CAUTION: Do
notvent refrigerant to the atmosphere; use refrigerant
recoveryequipment.
DischargePressure Too Low
Indoortemper ature setting too high or too low Checktempe rature setting.
Outdoorcoil dirty or obstructed Cleanor remove obstructions.
Indoorunit air filter dirty Clean filter.
SuctionPressure Too High Indoortemper ature setting too high or too low Checktempe rature setting.
Reversingvalve faulty or internal leak Replacer eversingvalve.
SuctionPressure Too Low
Indoortemper ature setting too high or too low Checktempe rature setting.
Evaporator coil covered with ice Aircirculation on the evaporator no tsu fficient; check and
repair.
Expansiondeviceor suction line clogged Checkand repair.
Outdoorfa n does not stop during defrost periods Check electrical parts.
OutdoorFan CyclingDue to Over ---
Temp e r a t u r e Pro tect i o n
Electrical connection loose Checkconnections.
Fanmotor burn out Replace.
Fanbearing seized Checkandrepair.
Expansiondevice clogged or covered with ice
Drainrefrigerant, evacuate and replace.
CAUTION:Do not vent refrigerant to th e atmosphere; use
refrigerantrecovery equipment.