A.O. Smith Innovo IR 12-160 Installation, User And Service Manual page 78

Code and description
F05 (lock out error)
Flame error
Too many flame failures
are detected
F07 (lock out error)
Ionisation error
Ionisation measured after
the gas control valve was
closed
F08 (lock out error)
Ionisation error
Ionisation measured
before the gas control
valve was opened
F09 (lock out error)
Temperature error
78
Cause
Recirculating flue gases due too
incorrect roof or wall flue terminal.
No sufficient gas supply.
Supply voltage too low.
Defective gas control valve.
Defective safety relay.
Temperature, in the tank is above the
97ºC.
Measure
- Make sure the flue terminal is installed
correctly, refer to Venting system (see
8.7). If necessary, connect the correct
flue terminal.
- Make sure that the terminal is
installed correctly, refer to Venting
system (see 8.7). If necessary connect
the flue terminal correctly.
- Make sure that there are no flue gas
leaks to the rest of the venting
system.If necessary reconnect the
venting system and replace any
damaged seals.
- Make sure that the flue terminal
discharges into a permitted area.
- Make sure that the CO
measured in the flue gas outlet is
correct, refer to CO
2
8.9.4).
- Make sure that the CO
measured in the air inlet is below
0.5 vol%.
- If necessary, reconnect the venting
system and change the necessary
seals.
Make sure that the gas supply pressure is
correct.
- Make sure that the supply voltage on
the controller is correct.
- If the supply voltage is below the
stated tolerance and the error
persists, contact your maintenance
and service engineer.
- Install an isolating transformer.
- Make sure that there is no flame after
the gas control valve has closed.
- If there is a flame, the gas control
valve must be replaced.
- Reset the controller.
- If error appears again, replace the
controller.
- See measure of error E01.
- Make sure that the wiring between 1
and 7 of J9 is connected and not
damaged.
- If necessary, replace or reconnect the
wiring.
- When the wiring is reconnected, reset
the controller.
Installation, Maintenance and Service part
-value
2
value (see
value
2