10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
264
Alarm code
02
Activation of Protection Device (High Pressure Switch) in Outdoor Unit or Compressor thermostat
activation (High Temperature Cut)
• Thealarmcodeisashedonthe7-segmentdisplayoftheoutdoorunit.
• The alarm code is displayed on the wired controller of the indoor unit.
Phenomenon
Cause
Check Item
Action (Turn OFF
Main Switch)
Activation of High
Pressure Switch
due to Excessively
Increasing High
Pressure
Excessively High Temp. Air to
Indoor Unit Heat Exchanger
Failure of
High Pressure
Switch
Failure of
Pressure Switch
Contact Failure
Incorrect
Connection
Overcharged Refrigerant
Contamination of Non-
condensable Gas into
Refrigerant System
Clogging of Discharge Pipe
Liquid line stop valve or gas line
stop valve is not fully opened
InsufcientAirowto
Heat Exchanger
Cooling: O.U. Heat Exchanger
Heating: I.U. Heat Exchanger
Calculate heat load
Check for hot air near ceiling
(Heating)
Check for short circuited air
(Heating)
Check for other heat source
Measure discharge pressure.
Check continuity after
decreasing of pressure.
Measure resistance with
tester
Check connection
Check system operating temp
Check ambient temp.and
pressure
Check for clogging
Check stop valves
Check for clogging of heat
exchanger
Checkfordustonairlter
Check for any obstacles
at inlet or outlet of heat
exchanger
Check service space is
sufcient
Check fan motor speed
Cooling: Outdoor Fan
Heating: Indoor Fan
Reduce heat load or use a
larger unit
Make circulation better
Remove short-circuited air
Remove heat source
Replace it if faulty
Repair looseness
Replace connector
Repair connection
Charge correct amount
of regrigerant
Recharge refrigerant after
vacuum pumping
Remove clogging
Fully open stop valves
Remove clogging
Remove dust
Remove obstacles
Securesufcientservice
space
Replace fan motor if faulty
Activation of
Compressor
Thermostat due to
High Compressor
Temperature
Refrigerant leakage
Check refrigerant
Correct refrigerant charge
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