A.O. Smith 120 through 250 Series User Manual
Page 74
is
Instruction manual BFC
74
F02 (lock out error)
Fan fails to run at
correct speed.
Defective motor and/or
rotor.
1. Check the motor and rotor
2. Replace the fan if the motor or rotor is defective.
3. Reset appliance controller
See the BFC electrical diagram
To have the wiring replaced and a new fan fitted, you must contact
your installation engineer
Damaged wiring
1. Check the wiring between the fan and the controller.
2. If any wires are damaged, the wiring harness must be replaced.
3. Reset appliance controller
Dirty or blocked fan
1. Check if the fan is dirty
2. Check that the rotor can rotate freely
3. Reset appliance controller
Because of a drop in
the supply voltage, the
fan is not running at the
correct speed.
1. Check the supply voltage, this must be 230 VAC (-15%, +10%).
2. Reset appliance controller
The F02 entries below are applicable solely to appliances that have a 3-phase fan with frequency controller.
Fun supplying
insufficient pressure
The live (phase) wires,
between freq. controller
and fan are connected
wrong way around
1. Check the wiring between the fan and the frequency controller
2. Rectify the assembly if it is incorrect
3. Reset appliance controller
See the BFC electrical diagram
To replace the necessary parts, you must contact your installation
engineer
Fan speed too low
1. Check the fan speed
2. If the fan speed is too low, check the settings
3. If the settings are correct, then replace the fan.
4. Modify the settings if incorrect
5. Reset appliance controller
Code + Description
Cause
Solution
Remark