A.O. Smith SGE Installation And Operation Manual page 83

Code + Description Cause
S18 (blocking error) Short circuit in sensor
circuit
Short circuit in temp.
sensor S1 in the
collector
F01 (blocking error) Live and neutral
connected wrong way
round
Defect in power supply
circuit
Condensation on the
flame probe
Floating neutral
F02 (lock out error) Defective motor and/or
rotor.
Fan fails to run at
correct speed.
Damaged wiring
Dirty or blocked fan
Because of a drop in
the supply voltage, the
fan is not running at the
correct speed.
Instruction manual SGE
Solution
Replace sensor S1
Connect live and neutral correctly (3.11 "Electrical
the appliance is phase-sensitive
1. Disconnect the lead at the flame probe
2. Ignite the appliance three times, with an interrupted ionisation
circuit
3. Reconnect the ionisation lead to the flame probe
4. Ignite the appliance again
5. The repeated ignition attempts will have caused the
condensation to evaporate
Install an isolating transformer (3.11.4 "Isolating transformer")
1. Check the motor and rotor
2. Replace the fan if the motor or rotor is defective.
3. Reset appliance controller
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
1. Check if the fan is dirty
2. Check that the rotor can rotate freely
3. Reset appliance controller
1. Check the supply voltage, this must be 230 VAC (-15%, +10%).
2. Reset appliance controller
Remark
To replace the necessary parts, you must contact your installation
engineer
connection"); See the SGE electrical diagram
If errors persist, contact your installation engineer
Contact your installation engineer to have an isolating transformer
installed
See the SGE electrical diagram
To have the wiring replaced and a new fan fitted, you must contact
your installation engineer
is
(17 "Appendices")
(17 "Appendices")
83