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Hydro Unit
Installation Manual
F14
Hot water cylinder temperature TTW sensor defect
If short-circuit or open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
F17
Floor inlet temperature TFI sensor defect
If short-circuit or open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
F18
Internal heater outlet temperature TWO sensor defect
If short-circuit or open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
F20
Floor inlet temperature TFI sensor disconnection or wrong installation
(This alarm is reset by stopping operation and is checked again.)
F23
Low-pressure sensor defect
If open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
F29
Hydraulic heat exchanger EEPROM defect
One mismatch is detected if there is no verification ACK after data write to the EEPROM
Reset condition: This alarm is inhibited while the unit is not working.
(When EEPROM1K is mounted, this alarm cannot be reset.)
F30
Onboard expansion IC defect
This alarm is not reset automatically.
L07
Group line in an hydro unit
This alarm is checked during initial communication immediately after power-on.
This alarm occurs immediately after operation start.
This alarm is not reset automatically. (This alarm is inhibited while the unit is not working, but occurs again after
the unit operates.)
L09
Hydro unit capacity has not been set.
This alarm is checked immediately after power-on.
This alarm is not reset automatically. (This alarm is inhibited while the unit is not working, but occurs again after
the unit operates.)
A01
Pump defect or abnormal flow rate
This alarm is not reset automatically.
A02
Excessive water temperature increase by the heating heater
Auto-reset:
A03
Excessive water temperature increase in the hot water cylinder
A04
Freezing is detected.
Auto-reset:
A07
High-pressure switch malfunction
This alarm is not reset automatically.
A08
Low-pressure sensor malfunction
This alarm is not reset automatically.
A09
Overheat preventive operation malfunction
Auto-reset: When operation mode is changed
A11
Release preventive operation malfunction
This alarm occurs when the Hydro Unit enters the forced-stop zone 10 times.
Alarm
indication
Alarm description and generation/reset conditions
41-EN
Summary of Contents for ESTIA HWS-1402XWHM3-E
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