6 Troubleshooting
Outdoor unit
SMGB0135 rev.0 - 06/2020
69
6
6.1.7 Service Call Q&A
Q1
A1
Q1
A1
Q1
A1
Q2
A2
Q3
A3
HEATING MODE
DEFROST
OTHERS
Loud noise from the outdoor unit is heard when
operation is started
Noise from the outdoor unit occasionally
changes.
There is a dierence between the Displayed
water temperature and Actual water
temperature.
When operation is started, the compressor
rotation speed goes to increase the heating
capability, so noise becomes slightly louder.
This does not indicate a fault.
The compressor rotation speed changes
according to the dierence between the
thermostat set temperature and water
temperature. This does not indicate a fault.
The temperature of the displayed water is a
temperature lower in the tank. A temperature
upper in the tank might be high.
Water comes out of the outdoor unit
After the ON/OFF button is pressed to stop
heating, the outdoor unit is still working and
defrost
icon will appear at the controller
main screen
Defrost is carried out: the system checks
the outdoor heat exchanger and defrosts
it as necessary before stopping operation.
The outdoor unit discharges water during
defrosting.
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