6 Troubleshooting
Indoor unit
SMGB0135 rev.0 - 06/2020
73
6
Alarm code
71
Tank over-temperature limit protection
• The alarm code is displayed on the LCD controller when the temperature of the water is higher than 86 °C.
• This alarm forces the heat pump and the heater to stop.
• The unit should be stopped to release the alarm.
Is the
heater
working?
Is the
heater
working?
Check and restart
the thermostat
reset switch
Disconnect
wires and check
heater continuity
Is there
continuity?
Faulty heater
(Change it)
Disconnect CN15
Relay-AR from
the PCB
Is the
heater still
working?
Check relay-AR
continuity
Is there
continuity to
the heater
thermostat?
Faulty PCB
(Change it)
Faulty realy-AR
(Change it)
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Alarm code
80
Communication failure between Indoor unit and LCD controller (PC-ARFTE)
• The alarm code is displayed on the unit controller when there is no communication between indoor unit PCB and the
unit controller for 90 seconds.
• This alarm forces all operations to stop.
• The unit should be stopped to release the alarm.
Unit
Controller
PCB
CN2-1
CN20-1
CN2-2
CN20-2
CN2-3
CN20-3
CN2-4
CN20-4
Are the connections
between PCB and
LCD controller correctly
connected?
Yes
Check wiring: repair broken / wrong wiring
No
Faulty Unit controller or PCB
(Check it)
Contact your local dealer
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