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Diagnostic functional operation
Check
code
Operational cause
Regular communication error
between hydro unit and outdoor unit
E04
The serial signal cannot be received
from outdoor.
Duplicate address of Hydro unit, or
E08
Duplicate master Hydro unit during
Group control
Regular communication error
E18
between master Hydro unit and slave
Hydro unit during Group control
TC sensor error
F03
Open or short circuit in the heat
exchange temperature sensor.
TWI sensor error
F10
Open or short circuit in the water inlet
temperature sensor.
TWO sensor error
Open or short circuit in the water outlet
F11
temperature sensor.
Determination and action
Backup
Automatic
operation
reset
1. Check the serial circuit.
• Miswiring of the crossover between
O
O
the water heat exchanger and the
outdoor unit
1. Set the address No. of the Rotary
×
O
switch "SW01" correctly for each
Hydro unit.
1. Check the Hydro unit connection.
×
O
• Miswiring of the master and slave
Hydro unit.
1. Check the resistance value and
O
O
connection of the heat exchange
temperature sensor (TC).
1. Check the resistance value and
O
O
connection of the water inlet
temperature sensor (TWI).
Heating
1. Check the resistance value and
×
O
connection of the water outlet
Hot water
temperature sensor (TWO).
O
87
Number of
abnormalities
Detailed
for
item
confirmation
1
103
1
—
1
—
1
104
1
106
1
106
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