A.O. Smith BFM - 100 Installation & Service Manual page 61

Symptom Cause
Burner control reset There are three possible causes for this error. In order to determine the cause, you must
button (burner control cause the error to appear again:
lock out error)
1. Reset the appliance by pressing the reset button 1x
2. Cause (a) occurs between step 4 and step 5 of the heating cycle
3. Cause (b) occurs in step 5 or 6
4. Cause (c) occurs in step 7
(a) Continuous failure
in the safety circuit
(b) Failed start attempt No gas:
(c) Failure in the safety
circuit during heating
(the safety thermostat
has switched)
Instruction manual BFM
Solution
1. Check whether the thermostat is defective
2. Check whether the sensor of the thermostat is defective
3. Check the leads of the thermostat
1. Check that the gas valve is open
2. Check whether the gas control is opening (clicking of the gas
control)
3. Check the leads of the gas control
No ignition:
1. Check whether the spark igniter is sparking in the pilot flame
cap
2. Check the leads of the glow igniter
3. Check whether the spark igniter is correctly mounted in the
bracket
No flame detection:
1. Check whether the flame probe is defective
2. Check that the flame probe leads are properly connected
1. Check whether the control thermostat is working
2. Check whether the high-limit thermostat is working
3. Check that the circulation pump (if present) is working
Remark
see the appliance's heating cycle (9.3 "The appliance's heating
cycle")
If the error cannot be resolved or is persistent, contact your
installation engineer
If the error cannot be resolved or is persistent, contact your
installation engineer
If the error cannot be resolved or is persistent, contact your
installation engineer
is
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