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Quick Reference Guide - Page 29
Alarm Indications
Alarm
indication
Alarm description and generation/reset conditions
E03
Regular communication error between hydro unit and remote controller (system controller) If there is no
regular communication from the remote controller for three minutes, the hydro unit regards it as no
remote controller. If there is no communication from both sides, alarm E03 occurs. Auto-reset: When
successful regular communication is made
E04
Regular communication error between hydro unit and outdoor unit When serial signal from the outdoor
unit cannot be received though normal serial signal is sent to the outdoor unit 1) When serial signal
cannot be received continuously for 60 seconds (S code communication) 2) Communication is still not
successful for 80 seconds through three retries if serial signal cannot be received for 20 seconds after
new communication (f code) starts When the remote controller starts operation, serial transmission
starts with the new communication format. Auto-reset: When successful regular communication is
made
Condensing temperature TC sensor defect
F03 If short-circuit or open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
Hydraulic heat exchanger inlet temperature TWI sensor defect
F10 If short-circuit or open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
Hydraulic heat exchanger outlet temperature TWO sensor defect
F11 If short-circuit or open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
Hot water cylinder temperature TTW sensor defect
F14 If short-circuit or open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
Floor inlet temperature TFI sensor defect
F17 If short-circuit or open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
Internal heater outlet temperature TWO sensor defect
F18 If short-circuit or open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
Low-pressure sensor defect
F23 If open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
Hydraulic heat exchanger EEPROM defect
F29
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.)
F20
Floor inlet temperature TFI sensor disconnection or wrong installation (This alarm is reset by stopping
operation and is checked again.)
F30 Onboard expansion IC defect This alarm is not reset automatically.
Group line in an hydro unit
L07
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.