Unical Osa S 24, Installation And Servicing Manual

Page: 44 / 52

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4.5 - ERROR CODES
Failure that could NOT cause stop of the boiler:
-
Error code is displayed, the boiler is in CH
demand, Icon Reset (note that was detected
a fault even if the fault was temporary.
Is therefore necessary always push reset to
clear the display’ ‘‘error’’
Failure that causes the stop of the boiler:
- The error code is displayed, the boiler is in lock.
After resolving the fault press Reset to restart the
boiler.
ERROR CODES (FAULT) ( Num ) = see key Par. 2.2
CODE
DESCRIPTION SOLUTIONS
01
SAFETY THERMOSTAT
Intervention of the safety thermostat (10)
Press Reset and/or check that the thermostat or
its connections are not interrupted.
04
BLOCK
No gas or failed burner ignition
Check the gas supply or that the ignition/detection
electrode is working properly (4) .
06
High Temperature
Boiler temperature too high
Check pump operation and if needed
clean the exchanger (24)
08
Water Deficency
Insufficient water pressure and consequent
intervention of the minimum water pressure
- pressure switch ( 13 ) .
Fill the heating circuit as described in chap. 3.8 and
wait for the values to return within default limits.
If needed, check the electrical connections and
replace the minimum water pressure switch.
09
Outer Sensor Check the wiring, if needed replace outer sensor
10
Internal failure
11
Parasite Flame
Flame detected upon ignition
Check the wiring of the Ign/Det. electrode and re -
move any oxidation. Check for humidity between
drain wire and ceramic, if necessary, replace the
electrode, press the unblock key, if the anomaly
persists, replace the electrode (4).
12
Heating Sensor (11)
Heating sensor fault
Check the efficiency of the sensor (see table Res/
Temp) (Par.4) or its connections.
13
Domestic Hot Water Sensor
Domestic hot water sensor fault (1)
Check the efficiency of the sensor (see table Res/
Temp) (Par.4) or its connections..
14 Inlet temperature Sensor
(SRR)
Check the efficiency of the sensor / and replace it
15
Water circulation insufficent
Primary circuit water circulation insufficient
(∆t > 35° C)
Check pump operation (12) and speed - remove
any heating system obstructions - clean the scaled
domestic hot water exchanger