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KONA
3�3�2 Opening the casing
To open the casing:
1 Unscrew the screws
2 Remove the front panel
3 Disconnect the Display Panel's wiring
Before doing any work inside the water heater, di-
sconnect the power supply and close the gas valve.
3�4 ERRORS
The water heater is fitted with an advanced self-testing system. If a problem arises with the unit, the fault symbol will flash on the
display and the respective code will be displayed, with an acoustic signal sounding at the same time. If a fault occurs, all gas valves
close immediately. The fan continues moving for 30 seconds, until it stops. With the E2 error, the fan will continue moving until
the flame signal disappears, at which point it will stop 30 seconds later.
To reset the unit's operation after an error, it is enough to just close the hot water tap, or to touch the Standby key, to put the water
heater into STANDBY. With the E2 error, the user must unplug the water heater and plug it in again to reset it. If the error per-
sists after these reset steps, the fault must be resolved.
3�4�1 Error list
Error
Code
Fault in the outlet temperature
E0
probe
E1
No ignition or no flame
Presence of a flame anomaly or
E2
parasitic flame
E3
Overheating cut-off thermostat
Fault with the inlet temperature
E4
probe
E5
Fan fault
E6
ACS overheating
E7
Valve fault
E8
Blocked pipe
En
ACS time up
EC / Ec Display panel connection
3�4�2 Error History
From the STANDBY state, keep the " – " key pressed for 5 seconds to access the Error History Interface, initially showing "HI".
Touching the Standby key you begin to see the last 10 Errors that occurred in the water heater. At this point the lower display shows
the last error code that occurred, and the upper display shows "01", beginning to list the errors that occurred. Scrolling through them,
01~10, the last ten water heater error codes appear. Touch the Standby key to exit the history view.
Touch the " – " key to change from "HI" to recovery of Errors "rE"; from this option, keep the ECO key pressed for 5 seconds to delete
the history (the 10 Errors) and exit the interface at the same time. From either of the two modes, "HI" or "rE", keep the " – " key pressed
for 5 seconds to exit the error history interface.
3�5 PARAMETERS
There is a parameter list (which the user cannot change), to make internal settings in the water heater. Access to the Parameter
menu is made from the STANDBY state keeping the ECO key pressed for 5 seconds, until "PP" appears on the display. Touch the
Standby key and the first "FA" parameter appears on the display.
Water outlet NTC temperature probe sensor open or shorted
The system does not detect a flame after two attempts to ignite, or there is no flame during
normal operation
Before starting the system detects the flame, or after the system stops for 5 s and then detects
the flame
Overheating safety cut-off thermostat circuit open
Water inlet NTC temperature probe sensor open or shorted
Speed continuously under 600r/min for 2 s, or the system cannot detect the speed signal
Water outlet NTC probe sensor temperature above 85 °C for 5 s
Valves that activate shorted transistors or valves in open circuit
Fan speed above the wind screen pressure warning speed preset by the software, or above the
HC or LC values shown in the parameter menu (see HC and LC parameters)
Maximum continuous heating time, according to nE (60 min by default, see nE parameter)
Fault on the main electronic card's communication wiring with the display panel
A73023750 - Rev. 00 - 2022-09
Possible cause
69
EN
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