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“RUN” light flickers and “ALARM” is indicated on the remote control switch.
The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the alarm code is indicated on the display of the outdoor unit PCB.
In the case that the evaporating temperature (Cooling: Liquid Refrigerant Piping Temp. of Indoor
Unit, Heating: Evaporating Temp. of Outdoor Unit) is lower than -35 deg. retry operation is performed
3 minutes after compressor stoppage.
However, when the state occurs more than 3 times including 3 in one hour, this alarm code is
indicated.
Alarm
Code
Activation to Protect System from Excessively Low Suction Pressure
(Protection from Vacuum Operation)
Is the thermistor THM8
of outdoor unit connected
to PCB1?
Is gas leaking?
Yes
Yes
Yes
Connect it.
Faulty thermistor.
No
No
Is the thermistor THM3
of indoor unit connected
to PCB?
Is resistance of THM3
and THM8 between
0.24k
Ω
and 500k
Ω
.
Connect it.
No
Repair leaks of gas.
No
Recharge refrigerant.
Yes
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Faulty Freeze
Protection
Thermistor of
Indoor Unit
Evaporating
Thermistor of
Outdoor Unit
Excessively
Low Suction
Pressure
(in Vacuum)
Check resistance.
Replace thermistor
if faulty.
Fault
Check wiring to PCB.
Repair wiring and
connections.
Incorrect Connection
Check stop valve.
Fully open stop valve.
Liquid Line Stop Valve
is not in Operation
Check each temp.
and pressure.
Charge refrigerant after
vacuum pumping.
Refrigerant Leakage
Check gas leakage part.
Correctly charge
refrigerant after
repairing gas leakage.
Replace PCB and
check operation.
Replace PCB if faulty.
Faulty PCB
(Outdoor Unit, Indoor Unit)
Check for clogging.
Remove clogging.
Check connecting
wiring and connectors.
Replace connector.
Check operating sound
from coil.
Replace coil.
Check discharge gas
thermistor.
Check attaching
state of discharge
gas thermistor.
Replace thermistor.
Reattach thermistor.
Faulty or Malfunction of
Expansion Valve
Содержание Utopia PAS-3HVRG
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