Manuals / Baxi Potterton / Household Appliance / Boiler

Baxi Potterton 47-393-42 Replace safety thermostat, Replace PCB Is there 230V at, Replace sensor

Models: 47-393-40 47-393-41 47-393-39 47-393-42

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18.0 Fault Finding

I

1.

2.

Check supply pressure at the gas valve:-

Minimum 17 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 μ A

YES

NO

Replace PCB

Replace flame sensing electrode

J

1.	Overheat thermostat operated or				NO			Allow to cool. Continuity	YES
	faulty, i.e. continuity across				NO			across thermostat terminals	YES		Replace safety thermostat
	faulty, i.e. continuity across							across thermostat terminals			Replace safety thermostat
	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
		Motor 3-way valve						NO
2.

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

YES

Change pump supply cable

Replace motor 3-way valve

Replace PCB

L

M

1.

1.

Fan connections correct at fan.

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

Temperature sensors faulty. Cold resistance approximately 10kΩ @ 25° C (CH sensor)

20kΩ @ 25° C (Flue sensor)

(resistance reduces with increase in temp.)

YES	Replace fan

NO

Replace sensor

				YES
	2.	If pump is running the heat exchanger could be		YES		Replace heat exchanger
	2.	If pump is running the heat exchanger could be				Replace heat exchanger
		obstructed

© Baxi Heating UK Ltd 2012

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Baxi Potterton 47-393-42, 47-393-40, 47-393-39 manual Replace safety thermostat, Replace PCB Is there 230V at, Replace sensor

Contents

Installation & Service Instructions Potterton Titanium Natural GasScheme Members only Installer Notification GuidelinesCodes of Practice refer to the most recent version Important Installation, Commissioning, Service & RepairLegislation Technique Safe Manual HandlingGeneral PreparationContents Description Contents of PackIntroduction Expansion Vessel Automatic Air Vent Domestic Hot Water Mode Light DisplayGeneral Layout LayoutAppliance Operation Central Heating Mode FigDomestic Hot Water Mode Fig Frost Protection ModeTitanium 24, 28, 33 Technical Data22mm 15mm Dimensions and FixingsOrientation Tap Rail 32.5 mm Condensate Drain 65 mmBypass System DetailsInformation Central Heating CircuitPressure Relief Valve Fig System Filling and Pressurising FigExpansion Vessel Central Heating only Hard Water Areas Domestic Hot Water Circuit FigShowers At Least 1.5 7.2 Clearances Figs Site RequirementsLocation Electrical Supply Site RequirementVentilation of Compartments Gas SupplyCondensate Drain 500mm min 50mm perInsulation RunMinimum fall Boiler External runs & thoseFlue Horizontal Flues Each fitting to aid assemblyFlue Options Horizontal Flue SystemsApart Vertical FluesTwin & Vertical Flue Systems 120mm MinTelescopic Internal Flue Kit Flue AccessoriesKey Accessory Size Code No Air Duct Connection Flue Duct Connection Boiler Adaptor Twin Flue Duct AdaptorTwin Flue Connection Terminal Guard Fig Flue DimensionsFor Roof Terminals Flue TrimRing Bracket Plume DisplacementPlume Displacement Kit Fig Elbow/Plume Outlet AssemblyExample Flue Lengths OK 28/33/40Determining Permissible Lengths Example30mm General Fitting NotesExtension and outlet. Secure using two of the screws Elbow to allow the flue to be installed as shown60Ø extension piece. It must be secured using two Using a suitable bit e.g mm, drill throughAfter considering the site requirements InstallationUnpacking & Initial Preparation FlushingFitting the Filling Loop Kit Condensate Drain see section Fitting The BoilerFitting the Pressure Relief Discharge Pipe Fig Wall Thickness Waste Flue Fitting The FlueWall Thickness Flue Elbow Ensure Elbow is fully engaged into Boiler AdaptorEnsure Extension is fully engaged into Boiler Adaptor Inner Flue Support Bracket25mm Extension Cut End Preliminary Electrical Checks Making The Electrical ConnectionsScrew Pump Automatic Air Vent Selector Switch DisplayCommissioning Commissioning the BoilerPressure Setting the Timer Case Front Panel Facia Panel CompletionCompletion Annual Servicing Inspection Servicing13 .1 Annual Servicing Viewing Window 10 ±1Burner Sensing Electrode Spark and Sensing Electrodes Fig Changing ComponentsIgniter Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan Collector Fan FigVenturi Fig Injector FigBurner Gasket Extension Piece Burner FigInsulation Fig Flue/Heat Exchanger Thermostat Sensor Fig Central Heating Temperature Sensor NTC FigSafety Thermostat Fig DHW Temperature Sensor NTC FigAutomatic Air Vent Fig Pump Head Only FigPump Complete Fig Hall Effect Sensor Fig Pressure Gauge FigsPlate Heat Exchanger Fig Diverter Valve Motor Unit & Assembly Fig14.22 P.C.B. Fig Selector Switch FigExpansion Vessel Fig Throttle Adjustment ScrewGas Valve Fig Throttle Setting the Gas ValveSetting the Gas Valve CO2 check Flue Adaptor Test Point Plug Analyser ProbeElectrical Illustrated Wiring Diagram302 Short Parts ListShort Parts List 306Error Codes Fault FindingInitial Fault Finding Checks Pump runs Error 133 flashingGo to section ‘A’ Turn the selector switch to Reset position for 5 secondsOpen DHW tap fully Turn selector switch toError 133 flashing Go to section ‘I’ Turn Domestic Hot WaterReplace water PCB X3 connector terminals 3Switch terminal Fan jammed or faulty winding Replace PCBReplace gas valve Check wiring Viewing WindowReplace sensor or PCB E28 Gas at burnerReplace sensor Replace safety thermostatReplace PCB Is there 230V at Page Page GAS Boiler System Commissioning Checklist Service Record Potterton