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Hydro Unit
Installation Manual
EN
A13
Pump error
Heating
×
Hot water
O
×
1. Pump has stopped by a certain cause.
• Low supply voltage.
• High humidity around the electric box of the pump.
• Dew condensation to the electric board of the
pump.
• Once turn off the power supply to the system and
turn on again and operate the system.
2. Check the Flow switch in the Hydro unit.
E03
Regular communication error
between hydro unit and remote
controller
×
O
1. Check remote controller connection.
2. Defect in the remote controller.
E04
Regular communication error
between hydro unit and outdoor
unit
O
O
1. Check the serial circuit.
• Miswiring of the crossover between the hydro unit and
the outdoor unit
E08
Duplicate address of Hydro unit, or
Duplicate master Hydro unit during
Group control
×
O
1. Set the address No. of the Rotary switch "SW01"
correctly for each Hydro unit.
E18
Regular communication error
between master Hydro unit and
slave Hydro unit during Group
control
×
O
1. Check the Hydro unit connection.
• Miswiring of the master and slave Hydro unit.
F03
TC sensor error
O
O
1. Check the resistance value and connection of the
heat exchange temperature sensor (TC).
F10
TWI sensor error
O
O
1. Check the resistance value and connection of the
water inlet temperature sensor (TWI).
F11
TWO sensor error
Heating
×
Hot water
O
O
1. Check the resistance value and connection of the
water outlet temperature sensor (TWO).
F14
TTW sensor error
Heating
×
Hot water
O
O
1. Check the resistance value and connection of the hot
water cylinder sensor (TTW).
F17
TFI sensor error
Heating
×
Hot water
O
O
1. Check the resistance value and connection of the
floor-inlet temperature sensor (TFI).
F18
THO sensor error
Heating
×
Hot water
O
O
1. Check the resistance value and connection of the
heater outlet temperature sensor (THO).
F19
Detection of THO disconnection
error
Heating
×
Hot water
O
×
1. Check for any disconnection of the heater outlet
temperature sensor (THO).
F20
TFI sensor error
Heating
×
Hot water
O
×
1. Check the connection of the floor-inlet temperature
sensor (TFI).
O ... Possible
× .... Not possible
Check
code
Diagnostic functional operation
Determination and action
Operational cause
Backup
operation
Automatic
reset
58-EN
Summary of Contents for HWS-1405XWHM3-E
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