INSTALLATION AND OPERATION INSTRUCTIONS
5-4
SFT 199 TANKLESS WATER HEATER
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 fl ashing 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.
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 fl ame 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 fl ue for possible
recirculation or blockage of fl ue gases.
•
Poor internal grounding.
F006
Flame simulation.
•
Replace the gas valve.
•
Replace the burner controller.
F007
No or insuffi cient fl ame current.
•
Check the ignitor.
•
Check the wiring of the ignitor for breakage/shutdown.
•
Replace the ignitor.
