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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
F000
F001
F002
F003
F004
F005
F006
5-6
SFC COMBI BOILERS SFC-99, SFC-125
DESCRIPTION
Heat exchanger temperature sensor S0
is defective.
Temperature is too high
during central heating
demand.
Temperature too high
during DHW demand.
Flue gas temperature is
too high.
No flame during start-up.
Flame disappears during
operation.
Flame simulation.
POSSIBLE CAUSE / SOLUTION
Replace heat exchanger sensor S0.
•
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.
•
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.
•
Check the heat exchanger for contamination.
•
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.
•
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.
•
Replace the gas valve.
•
Replace the burner controller.
INSTALLATION AND OPERATION INSTRUCTIONS
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