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Unical EVE 05 CTFS 24 F Manual

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Service info
2.8 FAILURE CODES
In case of failure the burner is automatically deactivated and the symbol on the display
is shown. By pushing the reset button the failure blinking code is shown on the display.
Each fault is characterised by a priority level : if different failures are detected at the same time,
the code with the highest priority level is shown.
The following failure codes are recognised:
2.10.1 Lock-out (priority 1)
Description:
Modureg coil interrupted
Possible solution:
verify the wiring, replace the modureg
2.10.2 Lock-out (priority 2)
Description:
Fault at the fan pressure switch
Possible solution:
Verify the fan pressure switch (TFS version) and the electric connections or
replace the main PCB.
2.10.3 High temperature (priority 3)
Description:
Overheating of the boiler
Possible solution:
verify the correct operation of the pump and, eventually, descale the heat exchanger.
2.10.4 Difficult smoke evacuation (priority 4)
Description:
Difficult smoke evacuation
Possible solution:
TN boilers: verify the chimney draught, or the smoke thermostat.
TFS boilers: verify the fan and its own pressure switch operations.
2.10.5 Lack of water (priority 5)
Description:
Insufficient water pressure: intervention of minimum water pressure switch.
Possible solution:
Set the water pressure by the filling valve and look for possible leakages. If the code appears
again, call the service technician.
2.10.6 FROST (priority 6)
Description:
Freezing of the heat exchanger is detected if CH sensor < 2°C; ignition in inhibited until CH
sensor reaches 5°C.
Possible solution:
Cut off the voltage, close the gas feeding, call the service technician.
2.10.7 High Limit thermostat (priority 7)
Description:
High limit thermostat intervention
Possible solution:
Verify the water circulation into the heat exchanger; verify that the high limit thermostat and its
own connections are not interrupted
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