A.O. Smith Innovo 12-160 Installation, Service & Maintenance Manual page 74

Code and description
C05 (blocking error)
Control error
E01 (blocking error)
Temperature error
E03 (lock out error)
Temperature error
E05 (lock out error)
Control error
F01 (blocking error)
Control error
F02 (lock out error)
Fan error
Fan does not run on
correct speed
74
Cause
Content EEPROM not correct.
The temperature in the tank is above
90ºC.
Temperature difference, between sensor
1 and sensor 2, is more then 10ºC, for
at least 60 seconds.
Control was in a blocking error for at
least 20 hours.
Live and neutral are connected the
wrong way around.
Floating zero is present.
Damaged or disconnected wiring.
Contaminated or blocked fan.
Due to a drop in supply voltage, the fan
will not run at the correct speed.
Defective motor and/or rotor.
Measure
Reset the controller.
If the error reappears, contact your supplier.
• Tap off water, so the temperature drops
in the water heater.
• Reset the controller.
• Make sure that there is no scale on the
temperature sensor. If necessary, replace
the sensor.
Make sure that the sensor wiring is
connected and not damaged. Reset the
controller.
If necessary replace the sensor and/or
wiring if the error reappears.
• Press [RESET] to reset the water heater.
If the error reappears:
• Find the cause of the blocking error
(parameter 272).
• Remove the blockage and reset the
controller.
If the error reappears, replace the
controller.
Make sure that the live and neutral are
connected correctly and rectify if necessary.
Install an isolating transformer.
• Make sure that the wiring between the
fan and the controller is connected and
not damaged.
• If necessary, replace the wiring. Reset
the controller when the wiring is
reconnected
• Make sure that the motor and/or rotor of
the fan are not dirty or blocked.
• If necessary remove the dirt and/or
blockage.
• Reset the controller.
• Make sure that the rotor of the fan can
rotate freely and reset the controller.
• Make sure that the supply voltage is
correct and reset the controller.
The measured voltage must be 230 V
(-15%, +10%)
• Contact you maintenance and service
engineer when the supply voltage is not
correct.
• Make sure that the motor and/or rotor
are not defective and reset the controller.
• Replace the fan when the motor and/or
rotor are defective and reset the
controller.
Installation, Maintenance and Service part
AC