A.O. Smith BFM - 120, BFM - 100 manual Symptom Cause Solution Remark, Cycle

					is
Symptom	Cause		Solution		Remark
Burner control reset	There are three possible		causes for this error. In order to determine the cause, you must		see the appliance's heating cycle (9.3 "The appliance's heating
button (burner control	cause the error to appear again:				cycle")
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		1.	Check whether the thermostat is defective	If the error cannot be resolved or is persistent, contact your
	in the safety circuit		2.	Check whether the sensor of the thermostat is defective	installation engineer
			3.	Check the leads of the thermostat
	(b) Failed start attempt		No gas:		If the error cannot be resolved or is persistent, contact your
			1.	Check that the gas valve is open	installation engineer
			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
(c) Failure in the safety	1.	Check whether the control thermostat is working	If the error cannot be resolved or is persistent, contact your
circuit during heating	2.	Check whether the high-limit thermostat is working	installation engineer
(the safety thermostat
has switched)	3.	Check that the circulation pump (if present) is working

Instruction manual BFM 61