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Auto Reset Alarms
The following are codes for auto reset alarms with their meanings.
Codes
Meaning
AL01
Compressor low pressure (D2)
AL02
Compressor high pressure (D3)
AL03
Low indoor side outlet water temperature protection (when ST ≤ AR01 in any
mode)
AL04
Low outdoor side outlet water temperature protection (when STo ≤ AR11 in heating
mode)
AL05
Indoor side outlet water temperature is over the highest limit in heating
mode(when ST ≥ AR03)
AL17
Flow switch alarm after the delay (AR05)
Manual Reset Alarms
The following are codes for manual reset alarms with their meanings.
Codes
Meaning
AL11
RT sensor trouble (over 120 ºC or lower than -35 ºC) (X1)
AL12
ST sensor trouble (over 120 ºC or lower than -35 ºC) (X2)
AL13
OT sensor trouble (over 120 ºC or lower than -35 ºC) (X3)
AL14
HT sensor trouble (over 120 ºC or lower than -35 ºC) (X4)
AL15
ST0 sensor trouble (over 120 ºC or lower than -35 ºC) (X5)
AL16
ET sensor trouble (over 120 ºC or lower than -35 ºC) (X6)
AL18
Alarm number of compressor low pressure within 24 hours is over the
limit(AR06)
AL19
Alarm number of compressor high pressure within 24 hours is over the
limit(AR07)
AL20
Low return gas temperature protection (AR08)
AL21
High exhaust gas temperature protection (over AR10 )
Warning and Alarm
