A.O. Smith Innovo 12-160 Installation, Service & Maintenance 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
F11 (blocking error)
Ionisation error
Ionisation measured with
a closed gas control valve
F19 (blocking error)
Supply voltage error
F21 (lock out error)
Air proving switch error
Switch is not closed, while
fan runs during post purge
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Cause
Recirculating flue gases due too
incorrect roof or wall flue terminal.
No sufficient gas supply.
Defective gas control valve.
Defective safety relay.
Temperature, in the tank is above the
97ºC.
Defective gas control valve.
There is not enough or too much supply
voltage present, during 60 seconds.
The measured voltage must be 230 V
(-15%, +10%).
Damaged wiring/open circuit.
Measure
• Make sure the flue terminal is installed
correctly, refer to Venting system (see
section 8.7). If necessary, connect the
correct flue terminal.
• Make sure that the terminal is installed
correctly, refer to Venting system (see
section 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
in the flue gas outlet is correct, refer to
CO value (see section 8.9.4).
2
• Make sure that the CO
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 (see section
13.3) pressure is correct.
• 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.
• 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.
• Make sure that the supply voltage on the
controller is correct.
• If the supply voltage is above or below
AC
the stated tolerance and the error
persists, contact your maintenance and
service engineer.
See measure of error F03 - Switch is not
closed when fan is running during pre-
purge.
Installation, Maintenance and Service part
-value measured
2
value measured
2