A.O. Smith BFM - 120, BFM - 100 manual Troubleshooting insufficient hot water

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11.3 Troubleshooting: insufficient hot water

Warning

Maintenance may only be performed by a qualified service and maintenance engineer.

Insufficient hot water

Symptom	Cause	Solution		Remark

Insufficient hot water	Water temperature	Set the control thermostat (7.5 "Control thermostat") to a higher
	setting (Tset) is too low	value
	Hot water supply is	1.	Reduce hot water consumption and give the appliance time to	If this error persists, check whether the high-limit thermostat is
	used up		heat up.	switching.
		2.	If this error persists, check whether the high-limit thermostat is
			switching.
			If this is the case, check that the circulation and/or top to bottom
			circulation pump are working.

Instruction manual BFM

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Contents Page Page More information Read this manual carefullyTrademarks LiabilityGis Table of contents Electrical diagram TroubleshootingPerforming maintenance Warranty certificateWhat to do if you smell gas Regulations IntroductionAbout the appliance Introduction Maintenance Forms of notation Target groupsSymbol Target group Chapter Target groups Description Overview of thisDocument Gis Principle Appliance Working principle of the applianceGeneral working Working principle of the appliance Appliances heating cycle Protection for the appliance Protection Description Water temperature protectionPressure switch Flame probe3 T&P valve Safety of the instal- lationUnvented installation Vented installationGis Packaging InstallationAir humidity and ambient temperature Air humidity and ambient temperatureWorking clearances InstallationMaximum floor load Water compositionTechnical specifica- tions Plan and elevation of the appliance Dimensions of the applianceUnit General and electrical specificationsDimens Description BFM100 BFM120 IonLP gas data G30 30 mbar butane Gas dataDescription Unit Natural gas G20 20 mbarInstallation diagram Installation diagramHot water side Water connections, VentedCold water side Recirculation pipeCirculation 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 thermostat ON/OFF switchControl panel Explanation of iconsControl panel Burner control reset buttonOperating modes Error conditionsStatus of the appliance Status of the appliance Appliances heating cycle Starting and runningStarting the appliance Starting and running Shutting the appliance down for a long period Shutting down the appliance for a brief period OFF modeShutting down Isolating the appliance from the mainsShutting down Control thermostat 7.5 Control thermostat TroubleshootingExplosive ignition Troubleshooting general errorsSymptom Cause Solution Remark Gas smell Water leakageSymptom Cause Solution Remark Insufficient hot water Troubleshooting insufficient hot waterTroubleshooting No hot water Cycle Symptom Cause Solution RemarkPage Introduction Preparation for maintenance Performing maintenanceChecking the anodes Descaling and cleaning the tankPerforming maintenance Water-side mainte- nance 12.3.1IMD-0235 R2 Checking the flue baffles Finalising mainte- nance Clean the burnersClean the orifices Gas-side mainte- nance 12.4.1Conditions for Instal- lation and use Warranty certificate13.1 General warranty 13.2 Tank warrantyWarranty certificate Electrical diagram Electrical diagram BFM Electrical DiagramOptional Components Electrical diagram Index Index 0306