Baxi Potterton Gold HE A Range manual Replace safety thermostat, Replace PCB Is there 230V at

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18.0 Fault Finding

I

1.

2.

Check the gas supply pressure: For Natural Gas greater than 10 - 11 mbar

Check and correct if necessary

1.The mechanical set of the gas valve (CO2 values - see instruction)

2.Flame sensing electrode and lead connections

3.Flame sensing electrode position

Flame current should be more than 0.5 μA

YES

Replace PCB

NO

Replace flame sensing electrode

J

1.	Overheat thermostat operated or				NO			Allow to cool. Continuity	YES
	Overheat thermostat operated or				NO			Allow to cool. Continuity	YES		Replace safety thermostat
	faulty, i.e. continuity across							across thermostat terminals
	faulty, i.e. continuity across							across thermostat terminals
	thermostat terminals							more than 1.5 ohm
	thermostat terminals							more than 1.5 ohm

	YES

				Replace PCB

K

	Is there 230V at:
							YES
1.
		Motor 3-way valve								Replace motor 3-way valve
		Motor 3-way valve						NO		Replace motor 3-way valve
2.

		PCB - X3 connector terminals								Replace PCB
		PCB - X3 connector terminals								Replace PCB
		5	& 6 central heating mode
		5	& 6 central heating mode
		5	& 7 domestic hot water mode

				YES

		Change pump supply cable

L

M

1.

1.

Fan connections correct at fan.

PCB - X401 connector terminals 5,6,7 & 8

Temperature sensors faulty.

Cold resistance approximately

YES

NO

Replace fan

10kΩ @ 25° C (CH sensor) 20kΩ @ 25° C (Flue sensor)

(resistance reduces with increase in temp.)

Replace sensor

2.

If pump is running the heat exchanger could be obstructed

YES

Replace heat exchanger

© Baxi Heating UK Ltd 2008

57

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Contents Installation & Service Instructions BS-EN ISO 9001 Accredited Company Natural GasScheme Members only Installer Notification GuidelinesImportant Installation, Commissioning, Service & Repair LegislationCodes of Practice refer to the most recent version General Safe Manual HandlingPreparation TechniqueContents Contents of Pack IntroductionDescription Layout General LayoutFrost Protection Mode Appliance OperationPump Protection Gold Combi 24, 28 & 33 HE a Technical DataOrientation Dimensions and FixingsFlue Ø 100mm Tap Rail 32.5 mm Condensate Drain 65 mm 22mm 15mmInformation System DetailsCentral Heating Circuit BypassSystem Filling and Pressurising Fig Expansion Vessel Central Heating onlyPressure Relief Valve Fig Domestic Hot Water Circuit Fig ShowersHard Water Areas Site Requirements LocationClearances Figs Ventilation of Compartments Site RequirementGas Supply Electrical SupplyCondensate Drain Flue terminal guard FlueHorizontal Flues Flue OptionsHorizontal Flue Systems This bend is equivalent to 1 metreTwin & Vertical Flue Systems Vertical Flues Twin PipeMetre for each 91.5 bend Metre for each 135 bend This bend is equivalent to 1 metreFlue Accessories Key Accessory Size Code No5111079 Flue Duct Adaptor Air duct adaptorFor Twin Flue Systems fit the adaptors as follows For Roof Terminals Flue DimensionsFlue Trim Flue Deflector FigPlume Displacement Plume Displacement Kit FigMetres Ring Adaptor 28/33 Additional Accessories Elbow 5121369 Elbow Pair 5121370Determining Permissible Lengths ExampleGeneral Fitting Notes Shown in . Complete the installation of the 60Ø30mm Exhaust, securing in the bracketsPlume Outlet Elbow Installation Unpacking & Initial PreparationFlushing Fitting the Filling Loop Loop and valves must be connected as shown in the diagram aDouble Check Valve Stop Valve Temporary Filling Loop Hose Fitting Cold Inlet Stop ValveFitting the Pressure Relief Discharge Pipe Fig Fitting The BoilerCondensate Drain see section Tighten all the connectionsWall Thickness Waste Fitting The FlueFlue Elbow Ensure Elbow is fully Engaged into BoilerInner Flue Support Bracket Ensure Flue is fully Engaged into Flue ElbowEnsure Extension is Fully engaged into Boiler Adaptor Preliminary Electrical Checks Making The Electrical ConnectionsTerminal Block Cover Cable ClampCommissioning Selector Switch DisplayCommissioning the Boiler Heat Exchanger Automatic Air Vent Screw PumpChecking Temperature ControlSetting the Timer Completion CompletionCase Front Panel Facia Panel 13 .1 Annual Servicing ServicingAnnual Servicing BurnerViewing Window Changing Components Igniter FigSpark and Sensing Electrodes Fig Venturi Fig Fan FigInjector Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan CollectorBurner Fig Insulation FigExtension Piece Safety Thermostat Fig Central Heating Temperature Sensor NTC FigDHW Temperature Sensor NTC Fig Flue/Heat Exchanger Thermostat Sensor FigPump Head Only Fig Heat Exchanger Automatic Air Vent FigPump Complete Fig Automatic Air Vent FigHall Effect Sensor Fig Pressure Gauge FigsPlate Heat Exchanger Fig Diverter Valve Motor Unit & Assembly Figs14.20 P.C.B. Fig Selector Switch FigCompletely undo the screws securing the control box Pin FigGas Valve Fig Expansion Vessel FigVenturi Inlet Pipe Temperature Control Selector Switch Display Combustion CheckChecking the CO2 Electrical Illustrated Wiring DiagramShort Parts List Short Parts ListKey Description Manufacturers Fault Finding Initial Fault Finding ChecksError Codes Reset position for 5 seconds Error 133 flashingDisplay illuminates Pump runsDomestic Hot Water Follow operational sequence Error 110 flashingTurn Domestic Hot Water Open DHW tap fullySwitch terminal PCB X3 connector terminals 3Fan jammed or faulty winding Replace PCB Is there 230V at Main terminals L and N Main terminal fuseReplace gas valve Gas at burnerTerminals 1 Ensure that the Hall Effect Sensor is in positionReplace safety thermostat Replace PCB Is there 230V atReplace heat exchanger GAS Boiler Commissioning Checklist Service Interval Record UK Comp No 5116282 Iss 7 4/08 Brooks House, Coventry Road, Warwick. CV34 4LL