Description of functioning
technical
39
F02
In the lighting up process the
PCB checks if the air pressure switch contacts are open prior
to the fan starting,if after 3 minutes if the air pressure switch contacts remain closed then
the boiler will lockout F2 (F21 IN HISTORICAL FAULTS)
In the lighting up process the PCB checks if the air pressure switch contacts are
closed.If after 6 minutes the air pressure switch contacts remain open the boiler locks out
If the air pressure switch contacts open whilst the boiler is running another lighting up
process will take place after 2 seconds. If the air pressure switch doesn´t close after 6
minutes the boiler gets locks out F2 (F22 F23 HISTORICAL FAULTS)
Possible causes:
- Fan failure
- Air pressure switch failure
- Obstruction in the flue or in flue venturi.
- Faulty PCB
F03
If the heating circuit’s pressure falls below 0.5 b, or the central heating low pressure
switch fails (contacts open) the boiler locks out. (F31 OR 32 HISTORICAL FAULTS)
F04
If the high limit thermostat activates at 102ºC) or fails (contacts open) the boiler
locks out.
F05
If there is any failure in the software protections of the boiler control program the boiler
gets locked.The user can not reset this fault, the circuit remains blocked.
(F 51 TO 58 HISTORICAL FAULTS)
F06
The boiler locks out if a flame is detected fl ame in the following cases:
If the burner lights, before the gas valve is opened and fl ame is detected for 6 seconds
If the burner shuts down once the gas valve is closed, but fl ame continues for 6 seconds When the boiler is in standby mode after 10 second detection of fl ame.
When the boiler locks out with the above fault, the pump and the fan run or remain wor-
king. This fault can be reset by the user.
F
8
F8
If there is any failure in the control panel PCB F8 will be displayed the control PCB
will need replacing. Part number (MCB3005)
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