Arikazan Ventum Series, Operation, Use And Maintenance Manual, Page: 20 / 38

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Troubleshooting
Signs of a fault Hints
1. The display is blank despite connection to the
supply network.

The main electric supply is off. Control the fuses
.
2. Preset boiler temperature on the display is
different than the programmed one

whether the hot utility water tank is filled at the time
and the preset hot utility water temperature is higher
than the boiler preset temperature; if so, the difference of
readouts will disappear after the hot utility water is filled,
or after decreasing the preset hot utility water
temperature.

whether the room thermostat is on
– set the service
parameter decreasing boiler preset temperature by
thermostat r0 = 0
3. central heating pump is inoperative

whether the boiler exceeded the parameter Pump
activation temperature (n0)
– wait or decrease this
parameter,

if the room thermostat is not blocking the central
heating pump - set the parameter central heating pump
down-
time (n8) to “0”.

if the hot utility water priority, which blocks the central
heating pump, is enabled
– disable the priority by setting
the hot utility water mode = 2 (Without priority),

Whether the central heating pump is not damaged or
clogged.
4. the fan is inoperative

check the value of the parameter Minimum airflow
power (n2)

check if the safety temperature limiter STB input
jumper is on terminals 1-2 (the jumper should be placed
only if no temperature limiter is connected).

check if the additional thermal protection sensor input
jumper is on terminals 11-12 (the jumper should be
placed only if no DZT-01 sensor is connected)

if the boiler manufacturer equipped it with a
temperature limiter STB with manual return to the initial
position; unlock it by removing the lid and pushing the
button, in accordance with the documentation provided
by the boiler manufacturer.

check the fan and replace it if necessary
5. the temperature is measured incorrectly

Check if there is good thermal contact between the
temperature sensor and the measured surface,

whether the sensor lead is not placed too close to the
mains cable,

If the sensor is connected to the terminal

Whether the sensor is not damaged.
6. in the hot utility water
– SUMMER mode, the
heaters are hot and the boiler overheats

Increase the parameter Extending hot utility water
pump operation (r4) in order to cool down the boiler
7. the hot utility water pump is active even after
the hot utility water tank has been filled

Set the parameter Extending hot utility water pump
operation (r4= 0)
8. the boiler overheats despite enabled fan

The reason can be a constructional defect of the
boiler, consisting in lack of protection against too high
chimney draught (no back shutter in the fan, or damaged
shutter), or the boiler is not tight.