INSTALLATION AND OPERATION INSTRUCTIONS
5-6
SFC COMBI BOILERS SFC-99, SFC-125
5.3 WARNINGS AND FAULTS
5.3.1 Warning Codes
During operation the controller can detect unusual situations and can take action to avoid damage to the heat
exchanger or other unsafe operations. During these situations, the controller limits the temperature and power output
of the burner, or temporarily disables operation entirely.
These warnings are shown flashing and visible on the main display, and displayed only when an unusual reading is
currently detected.
FAULT CODE
DESCRIPTION
POSSIBLE CAUSE / SOLUTION
F000
Heat exchanger temperature sensor S0
is defective.
Replace heat exchanger sensor S0.
F001
Temperature is too high
during central heating
demand.
•
Air in system. Bleed the central heating system
•
Pump does not run. Replace the pump.
•
Check the wiring of heating supply temperature sensor
S1 for breakage/shadow.
•
Check whether heating supply temperature sensor S1
is installed correctly.
•
Check for the correct operation of heating supply
temperature sensor S1.
•
Replace the heating supply temperature sensor S1.
F002
Temperature too high
during DHW demand.
•
Check wiring of domestic hot water sensor S3 for
breakage/ shutdown
•
Check whether domestic hot water sensor S3 is
installed correctly.
•
Check for the correct operation of domestic hot water
sensor S3.
•
Replace the domestic hot water sensor S3.
F003
Flue gas temperature is
too high.
•
Check the heat exchanger for contamination.
F004
No flame during start-up.
•
Gas valve is closed.
•
Gas inlet pressure lower than 4” or sometimes
disappears.
•
Gas valve or ignition unit is not receiving electricity.
•
Poor internal grounding.
F005
Flame disappears during
operation.
•
Condensation drain is blocked.
•
Gas inlet pressure lower than 4“ or sometimes
disappears.
•
Check adjustment of gas valve.
•
Check the air supply duct and flue for possible
recirculation or blockage of flue gases.
•
Poor internal grounding.
F006
Flame simulation.
•
Replace the gas valve.
•
Replace the burner controller.
