Service Call Q&A - Hitachi YUTAMPO Series Service Manual

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