Potterton SIRIUS FS Installation & Servicing Instructions Manual page 71

7.7 FAULT CODE TABLE (CONTINUED)
Code Display Description
151
BMU internal error
152
Parameterization error
153 Unit Locked
160 Fan speed threshold not reached
162
Air pressure switch
164
Flow pressure switch HC
166 Air Pressure Switch
192 Start Prevention
218 Pressure supervision
323
Water press 3 too low
Sirius FS
Causes / Rectification
Switch power off and then back on to appliance. Reset appliance
If problem persists, check polarity to appliance is not reversed.
Replace LMS14 PCB.
Incorrect / Conflicting parameters input. Review the last revised
parameters input to locate conflict.
Reset button has been pushed in for more than 10 seconds. Push
reset for 1 - 2 seconds to reset the fault. If symptoms persist check
reset button operation and if OK, replace LMS14 Interface PCB.
Required fan speed not reached - Check fan connections or replace
faulty fan unit.
Air control valve operation (opening) has not been detected by the
control system, after the fan has switched on. Check the operation
of the air control valve , position sensor, relays and check for flue
blockage.
Check for condensate blockage, flue blockage or restriction and
pressure switch operation. Check pressure switch value is 100 Pa
above the maximum pressure generated inside the flue system,
when the boiler is operating from cold.
Air control valve operation (closing) has not been detected by the
control system, after the fan has switched off. Check the operation
of the air control valve, position sensor, relays and check the flue
draught does not exceed 0.2 mbar (see section 5.5.2)
The burner interlock system, prevents the operation of an individ-
ual burner, if the Air Control Valve on the opposite burner is open
and the burner is in a lockout condition. Check operation of the air
control valve, position sensor, relays and check the flue draught
does not exceed 0.2 mbar (see section 5.5.2)
Water pressure inside boiler is low but not yet critical. Boiler will
continue to operate but at 80% of maximum output. Full output
power will not be available until the water pressure is at or above
minimum levels (see 3.2)
Water pressure inside boiler is too low for safe operation. Opera-
tion will automatically resume once water pressure is at or above
minimum levels (see 3.2)
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