A.O. Smith cyclone BFC - 80 Installation And Service Manual page 78

Code + Description Cause
F10 (lock out error) Pressure switch not
closing
Restriction on the
number of ignition
attempts based on
pressure switch state
changes.
F11 (blocking error) Defective gas valves
Flame detection with
closed gas valve.
Instruction manual BFC
Solution
1. Check the running speed of the fan
appliance")
2. Check that the hoses on the pressure switch and the air supply
hose between fan and burner are correctly fitted. Refit them if
necessary
3. Check for cracks in the hoses on the pressure switch and in the
air supply hose between fan and burner. If necessary, replace
the hoses.
4. Check that the flue gas outlet is compliant
flue").
5. Check for blockage in the flue gas discharge. Remove any
blockage that may be present
6. Check for blockage in the condensation water discharge.
Remove any blockage that may be present.
7. Measure the pressure differential across the pressure switch.
See the table in Preparation for
maintenance (15.2 "Preparation for
insufficient pressure differential, clean the heat exchanger. If the
pressure differential is acceptable, check that the pressure
switch is closing, using a multimeter.
See F07.
Remark
(12.5 "Display the selected If the error cannot be resolved or is persistent, contact your
installation engineer
To replace the necessary parts, you must contact your installation
engineer
(3.9 "Air supply and
maintenance"). If there is
is
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