A.O. Smith GWV - 120, Installation And Service Manual

Page: 82 / 102

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Instruction manual GWV 82
Code + description Cause Measures to take Comment
F10 (lock out error)
Restriction on the
number of ignition
attempts based on
pressure switch state
changes.
Pressure switch not
closing
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.
If the error cannot be resolved or is persistent, contact your
installation engineer
To replace the necessary parts, you must contact your installation
engineer
F11 (blocking error)
Flame detection with
closed gas valve.
Defective gas valves See F07.
F16 (lock out error)
Flow switch does not
close
Component is not
(correctly) connected
Remove the protective cap from the flow switch and connect the
wires to terminals COMM and N.O.
If the error cannot be resolved or is persistent, contact your
installation engineer
Component is not
(correctly) connected to
the controller
Connect the component's controller to connector JP!2. See the GWV electrical diagram (17 "Appendices")
Blocked vane switch Disassemble the flow switch from the T-piece and remove any lime
accretions or baked-on dirt from the van switch.
For repairing and cleaning the component, contact your installation
engineer.