Unical KUTter R 28, Installation And Servicing Manual

Page: 92 / 97

45
Maintenance instructions
ENGLISH
24 7 sPEED OUT OF
CONTROL
Alteration of the fan speed; the
speed is not reached.
Check fan operation (18) and
the connections.
26 8 sPEED OUT OF
CONTROL
Alteration of the fan speed; the
speed is above that requested.
Check fan operation (18) and
the connections.
6 8 HIgH TEMPErATUrE
Boiler temperature too high.
Check pump operation and if
needed clean the exchanger
(24)
8
NO
WATER
9 wATER DEFICIENCY
Insufficient water pressure and
consequent intervention of the
minimum water pressure - pres-
sure switch ( 13 ) .
Fill the heating circuit as de-
scribed in chap. 3.8 and wait
for the values to return within
default limits.
If needed, check the electri-
cal connections and replace
the minimum water pressure
switch.
16 10 EXcHANgEr
frEEZINg ( 24 )
Exchanger freezing is detected
If the heating sensor detects a
temperature below 2° C, burn-
er ignition is inhibited until the
sensor detects a temperature
above 5°C.
Disconnect the from the
power supply, close the gas
valve, defrost the exchanger
carefully.
LIMIT
THERM.
11 SAfETY THErMOSTAT
Intervention of the safety ther-
mostat
(10).
Press the unblock button on
the panel and/or check that the
thermostat or its connections
are not interrupted.
13 12
DOMESTIC HOT WATER
SENSOR
Domestic hot water sensor fault
(1).
Check the efficiency of the
sensor (see table Res/Temp)
(Par.4) and its connections.
12 13 HEATINg SENSOr (11)
Heating sensor fault.
Check the efficiency of the
sensor (see table Res/Temp)
(Par.4) and its connections.
38 14 FACTORY PARAMETERs
Alteration of the factory param-
eters due to possible electro-
magnetic interferences.
Press the unblock key; if the
anomaly persists, replace the
board.