Indication Cause Measure
Insufficient or no hot
water
The water heater is off. Turn on the water heater (see section 4.1).
There is no supply voltage. Make sure that:
the control switch is set to I.
the isolator is in ON position.
there is power on the isolator.
there is power to the electrical connector
block.
The measured voltage must be
230 V
AC
(-15%, +10%).
•
•
•
•
The hot water supply is used up. Reduce the hot water consumption. Wait
until the water heater heats up.
The controller is in the OFF mode. Set the controller in the ON mode.
The temperature (T
set
) is set too low. Set the temperature (T
set
) to a higher value.
CO
2
value (at full load)
is not correct
The unit is not set for the correct gas
type
Make sure that the gas type corresponds
with the information on the rating plate
Make sure if the venturi restrictor has the
correct diameter, refer to Gas details.
•
•
Contaminated venturi Remove any contamination from the venturi
inlet.
Leakage between venturi and flexible
venturi connector
Make sure that the flexible venturi
connector is not damaged.
If necessary replace the flexible venturi
connector
Make sure that the flexible venturi
connector is correctly connected.
If necessary, tighten the clamp.
•
•
Recirculation of flue gases Make sure that the CO
2
-value measured
in the flue gas outlet is correct, refer to
CO
2
value.
Make sure that the CO
2
value measured
in the air inlet is below 0.5 vol%.
If necessary, reconnect the venting
system and change the necessary seals.
•
•
•
11.1.2 Displayed errors
Note
For the coding of the connections, refer to the Electrical wiring diagram.
Note
Contact your service and maintenance engineer if the error persists.
Code and description Cause Measure
S01 (blocking error)
Open circuit from
temperature sensor T
2
at
the bottom of the tank.
Sensor is not (correctly) connected Connect the sensor lead to JP3
Damaged cable and/or defective sensor Replace the cable and/or sensor
n
0311704_BFC_28-120_III_ENEN_V2.4, 2022-10-17 91
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