A.O. Smith GWV - 120 Installation And Service Manual page 81

Code + description Cause
F06 (blocking error) Damaged cable in
contact with metal
surface.
Short circuit between
flame probe and earth
Ceramic part of the
flame probe is
broken/cracked.
F07 (lock out error) Defective gas valves
A flame has been
detected after the gas
valve was closed.
F08 (lock out error) Flame detection before
the gas valve opened.
Error message from
safety relay
F09 (lock out error) Temperature T
T is greater than 99
3
Water temperature
safety.
Instruction manual GWV
Measures to take
Check the wiring of the flame probe. Replace the wiring if
necessary..
1. Check that the ceramic part of the flame probe is still intact in
the vicinity of the burner's air distribution plate.
2. If not, the flame probe must be replaced.
1. Check whether there is still burner pressure present after the
gas valves have closed.
2. Check whether a flame is still present after the gas valves have
closed.
3. If this is the case, the gas control must be replaced.
1. Reset electronic controller.
2. If the error appears again, replace the electronic controller.
3. If this is the case, the gas control must be replaced.
, T or 1. Check that the system pump is functioning.
1 2
o
C.
2. Check the position of the temperature sensor T
3. Reset appliance controller
Comment
If the error persists, 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
To replace the necessary parts, you must contact your installation
engineer
If the error cannot be resolved or is persistent, contact your
installation engineer
To replace the necessary parts, you must contact your installation
engineer
Error F09 remains active in the event that the water temperature
during a reset was higher than 90
., T and T .
1 2 3
water off by opening the nearest hot water tap, so that cold water
can flow in.
If the error cannot be resolved or is persistent, contact your
installation engineer
is
o
C. If this is the case, first draw
81