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Diagnostic functional operation
Check
code
Operational cause
Pump failure (for zone2)
A15
Regular communication failure
between hydro unit and remote
controller
E03
When there is no regular communication
from the remote controller for 3 min, or
when no remote controller is equipped.
Regular communication failure
between hydro unit and outdoor unit
E04
The serial signal cannot be received
from outdoor.
Duplicate address of Hydro unit, or
Duplicate master Hydro unit during
E08
Group control
Regular communication failure
between hydro unit and 0-10 V-IF
E14
When there is no regular communication
from the 0-10 V interface for 3 min, or
when no 0-10 V interface is equipped.
Regular communication failure
between master Hydro unit and slave
E18
Hydro unit during Group control
TC sensor failure
F03
Open or short circuit in the heat
exchange temperature sensor.
TWI sensor failure
F10
Open or short circuit in the water inlet
temperature sensor.
TWO sensor failure
Open or short circuit in the water outlet
F11
temperature sensor.
TTW sensor failure
Open or short circuit in the hot water
F14
cylinder sensor.
TFI sensor failure
Open or short circuit in the floor
F17
temperature sensor.
(Only when zone 2 is used)
Determination and action
Backup
Automatic
operation
reset
1. Pump has stopped by a certain
cause.
• Low supply voltage.
• High humidity around the electric
box of the pump.
O
X
• Dew condensation to the electric
board of the pump.
• Pump lock due to clogging or dust.
• Once turn off the power supply to
the system and turn on again and
operate the system.
1. Check remote controller connection.
X
O
2. Failure in the remote controller.
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 DN_12 - 14
X
O
correctly for each Hydro unit.
1. Check the 0-10 V-IF connection.
X
X
2. Failure in the 0-10 V-IF.
1. Check the Hydro unit connection.
X
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).
1. Check the resistance value and
X
O
connection of the water outlet
temperature sensor (TWO).
Heating
1. Check the resistance value and
O
O
connection of the hot water cylinder
Hot water
sensor (TTW).
X
Heating
1. Check the resistance value and
X
O
connection of the floor-inlet
Hot water
temperature sensor (TFI).
O
115
Number of
abnormalities
Detailed
for
item
confirmation
2
—
1
—
1
117
1
—
1
—
1
—
1
117
1
119
1
119
1
120
1
120
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