Error
Code
Error
Fault
Possible Cause
Solution(s)
E 01
Exhaust gas Thermostat (boiler
with open combustion) intervention
The boiler does not operate,
E01 error code blinks
> Exhaust gas sensor fault
1-) Restart the boiler by pushing RESET button.
2-) Call the authorized service if fault remains unsolved.
E 02
Water pressure in the system is
low/system parameters are set
incorrectly
The boiler does not operate,
E02 error code blinks
> Water pressure in the
boiler is not sufficient
> TsP parameter is set
incorrectly
1-) Fill the boiler up to 1,2-1,5 bar as specified in the manual,
the problem will be automatically solved.
2-) Check if the system pressure is 1,2-1,5 bar from the
manometer on the lower right side of the boiler
3-) Call Authorized service if the fault remains unsolved
4-) Restart the boiler by pushing RESET button.
E 03
High water pressure in the system
The boiler does not operate,
E01 error code blinks
>Water pressure in the
system is higher than 3,8
bars
1-) Drain the boiler down to 1,2-1,5 bar as specified in the
manual, the problem will be automatically solved
2-) Check if the system pressure is 1,2-1,5 bar from the
manometer on the lower right side of the boiler
3-) Call Authorized service if the fault remains unsolved.
4-) Restart the boiler by pushing RESET button.
E 04
Hot Domestic Water temperature
sensor is faulty
The boiler does not operate
in Hot Domestic Water mode,
but operate in Heating system
mode, E04 Error Code blinks
on the display
> Hot Domestic Water
temperature sensor is
faulty
1-) Restart the boiler by pushing RESET button.
2-) Call the authorized service if fault remains unsolved.
E 05
Heating system supply
temperature sensor is faulty
The boiler does not operate,
E05 error code blinks
> Heating system supply
temperature sensor is
faulty
1-) Restart the boiler by pushing RESET button.
2-) Call the authorized service if fault remains unsolved.
E 06
No ignition
The boiler does not operate,
E06 error code blinks
> Gas Supply fault
1-) First restart the boiler by pushing RESET button, and check
if problem is solved
2-) Check if other appliances burning gas are operating.
3-) Check if the main gas valve is open.
4-) Check if the boiler gas valve under the boiler is open.
5-) Restart the boiler by pushing RESET button, and check if
problem is solved.
6-) Call the authorized service if not solved.
E 07
Safety Thermostat intervention
The boiler does not operate,
E07 error code blinks
> Insufficient water in the
system
> Pump clogging
> Pump Failure
> Pump Equipment
clogging
1-) First restart the boiler by pushing RESET button, and check
if problem is solved
2-) Check if the boiler heating system valves are open, if not,
open all of them.
3-) Check if all radiator valves are open, if not open, minimum
3 meter-radiators must be on.
4-) Restart the boiler by pushing RESET button, and check if
problem is solved.
5-) Call the authorized service if not solved.
E 08
Flame circuit fault
False flame signal from burner
or electrode
> Wearing or corrosion of
electrode
> Electrode position
> Interruption on cable
> Water clogging in water
flow pipe
> Electronic card
1-) Restart the boiler by pushing RESET button.
2-) Call the authorized service if fault remains unsolved.
E 09
No water circulation in the system
The boiler does not operate,
E09 error code blinks
> Insufficient water in the
system,
> Pump clogging,
> Pump Failure,
> Pump Equipment
clogging
1-) Restart the boiler by pushing RESET button, and check if
problem is solved.
2-) Check if the boiler heating system valves are open, if not,
open all of them.
3-) Check if all radiator valves are open, if not open, minimum
3 meter-radiators must be on
4-) Restart the boiler by pushing RESET button and check if
the problem is solved
E 10
Heating temperature RETURN
sensor is faulty
The boiler does not operate,
E10 error code blinks
> Heating system RETURN
temperature sensor is
faulty
1-) Restart the boiler by pushing RESET button.
2-) Call the authorized service if fault remains unsolved.
E 11
Gas valve modulator is not
connected
The boiler does not operate,
E11 error code blinks
> Gas valve line
1-) Restart the boiler by pushing RESET button.
2-) Call the authorized service if fault remains unsolved.
E 12
Hot Domestic Water temperature
fault in summer mode
The boiler does not operate,
E12 error code blinks
> Hot Domestic Water
temperature sensor in the
boiler is faulty
1-) Restart the boiler by pushing RESET button.
2-) Call the authorized service if fault remains unsolved.
(P40) Heating ignition delay time.
The boiler appliance is equipped with an electronic timer in order to
prevent frequent ignition of the boiler. This time is set as 2 minutes as
default, and it can be extended up to 10 minutes.
(P42) Ready Hot Water (Preheat enabled/disabled).
This function heats up the boiler and keep water hot in order to
prepare your Hot Domestic Water request immediately as well as to
reduce cold water consumption while waiting. This function can be
enable or disable on 6-button Viwa 50 &
Viwa 65 models. Preheat function is enabled when hot water
temperature increasing RESET button is pushed until the cycle is
completed. Pre-On or Pre-Off is displayed on the LCD display for 5
seconds at the end of this time.
Activation of this function in Viwa 50 & Viwa 65 models is carried out
by our Authorized Service with parameter setting upon your request.
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