A.O. Smith GWV - 120 Installation And Service Manual page 82

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.
F16 (lock out error) Component is not
(correctly) connected
Flow switch does not
close
Component is not
(correctly) connected to
the controller
Blocked vane switch
Instruction manual GWV
Measures to take
1. Check the running speed of the fan
2. Check that the hoses are fitted correctly to the pressure switch
and the ventilator's air supply hose. Refit them if necessary
3. Check for cracks in the hoses on the pressure switch and in the
air supply hose for the fan. If necessary, replace the hoses.
4. Check that the flue gas outlet is satisfactory.
5. Measure the pressure differential across the pressure switch.
See the table (2.4.5 "Pressure switch"). If there is insufficient
pressure difference, clean the heat exchanger. If the pressure
differential is acceptable, check that the pressure switch is
closing, using a multimeter.
See F07.
Remove the protective cap from the flow switch and connect the
wires to terminals COMM and N.O.
Connect the component's controller to connector JP!2.
Disassemble the flow switch from the T-piece and remove any lime
accretions or baked-on dirt from the van switch.
Comment
If the error cannot be resolved or is persistent, contact your
installation engineer
To replace the necessary parts, you must contact your installation
engineer
If the error cannot be resolved or is persistent, contact your
installation engineer
See the GWV electrical diagram (17 "Appendices")
For repairing and cleaning the component, contact your installation
engineer.
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