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

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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
	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
			2.	Check whether the sensor of the thermostat is defective
			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
			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

(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	2.	Check whether the high-limit thermostat is working
(the safety thermostat
has switched)	3.	Check that the circulation pump (if present) is working

Instruction manual BFM

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Contents Page Page Trademarks Read this manual carefullyLiability More informationGis Table of contents Performing maintenance TroubleshootingWarranty certificate Electrical diagramAbout the appliance IntroductionWhat to do if you smell gas Regulations Symbol Target group Maintenance Forms of notation Target groupsIntroduction Document Overview of thisChapter Target groups Description Gis General working Working principle of the appliancePrinciple Appliance Working principle of the appliance Appliances heating cycle Protection for the appliance Pressure switch Water temperature protectionFlame probe Protection DescriptionUnvented installation Safety of the instal- lationVented installation 3 T&P valveGis Air humidity and ambient temperature InstallationAir humidity and ambient temperature PackagingMaximum floor load InstallationWater composition Working clearancesTechnical specifica- tions Plan and elevation of the appliance Dimensions of the applianceDimens Description General and electrical specificationsBFM100 BFM120 Ion UnitDescription Unit Gas dataNatural gas G20 20 mbar LP gas data G30 30 mbar butaneInstallation diagram Installation diagramCold water side Water connections, VentedRecirculation pipe Hot water sideCirculation pipe Water connections, Unvented See C in the installation diagram 3.5 Installation diagramGas connection Circulation pipeAir supply and flue Introduction Installing chimney flue components for BFM 30, 50Subject Description Concentric wall flue terminal BFMConcentric roof flue terminal BFM 30, 50 Installing chimney flue components for BFM 100 C33 concentric roof flue terminal specifications BFM 30, 50Concentric wall flue terminal BFM100 M2000 MDV SCC C13 concentric wall flue terminal specifications BFM 100Concentric roof flue terminal BFM 100 Electrical connection 11 C33 concentric roof flue terminal specifications BFM 100Mains power Fan Alarm Off Connecting the mains powerGas control for BFM 30 through Checking the supply pressure and burner pressureGas control for BFM BFM BFM 30, 50, 80Conversion Conversion to a different gas categoryConversion to a different gas category Orifice replacementPage Conversion to a different gas category Filling Filling Draining Draining Draining unvented installationsDraining vented installations Gis Control panel ON/OFF switchExplanation of icons Control thermostatControl panel Burner control reset buttonStatus of the appliance Error conditionsOperating modes Status of the appliance Starting the appliance Starting and runningAppliances heating cycle Starting and running Shutting down Shutting down the appliance for a brief period OFF modeIsolating the appliance from the mains Shutting the appliance down for a long periodShutting down Control thermostat 7.5 Control thermostat TroubleshootingSymptom Cause Solution Remark Gas smell Troubleshooting general errorsWater leakage Explosive ignitionSymptom Cause Solution Remark Insufficient hot water Troubleshooting insufficient hot waterTroubleshooting No hot water Cycle Symptom Cause Solution RemarkPage Introduction Preparation for maintenance Performing maintenancePerforming maintenance Descaling and cleaning the tankWater-side mainte- nance 12.3.1 Checking the anodesIMD-0235 R2 Clean the orifices Clean the burnersGas-side mainte- nance 12.4.1 Checking the flue baffles Finalising mainte- nance13.1 General warranty Warranty certificate13.2 Tank warranty Conditions for Instal- lation and useWarranty certificate Electrical diagram Electrical diagram BFM Electrical DiagramOptional Components Electrical diagram Index Index 0306