PCB X3 connector terminals 3, Switch terminal

18.0 Fault Finding

Fault Finding Solutions Sections

Is there 230V at:

1.Main terminals L and N

2.Main terminal fuse

3.PCB - X1 connector terminals 1,2

Is there 230V at:

Check electrical supply

Replace fuse

Check wiring

Display illuminated

Replace PCB

Pump	YES	If pump jammed, release

PCB - X3 connector terminals 3 & 4

YES

Change pump supply cable

CH system pressure less than 0.5 bar

NO	Replace pump

NO	Replace PCB

YES	Re-pressurise system

Check connection water pressure
switch terminal
switch terminal	YES	Replace water
COM - NO and PCB connector		pressure switch
X400 terminals 3,4		pressure switch

2.	Check the tap of the automatic air	NO
2.	Check the tap of the automatic air	NO	Open the automatic air vent
	vent is opened		Open the automatic air vent

D 1.

Fan connections correct at fan. PCB - X2 connector, is 230V AC across terminals 5 & 7

YES

Fan jammed or faulty winding

Replace PCB

YES

Replace fan

Page 57

Image 57

Potthof & Co 24kw PCB X3 connector terminals 3, Switch terminal, Replace water, Fan jammed or faulty winding Replace PCB

Contents

Installation & Service Instructions Benchmark Scheme Natural Gas Scheme Members only Installer Notification Guidelines Important Installation, Commissioning, Service & Repair LegislationCodes of Practice refer to the most recent version General Safe Manual HandlingPreparation Technique Contents Contents of Pack IntroductionDescription Layout General LayoutExpansion Vessel Automatic Air Vent Circulation Pump Drain Off Point Domestic Hot Water Mode Fig Central Heating Mode FigFrost Protection Mode Appliance Operation Gold Combi 24, 28 & 33 HE a Technical Data Dimensions and Fixings Information System DetailsCentral Heating Circuit Bypass Safety Pressure Relief Valve Fig System Filling and Pressurising FigExpansion Vessel Central Heating only Domestic Hot Water Circuit Fig ShowersHard Water Areas Location Site RequirementsClearances Figs At least Ventilation of Compartments Site RequirementGas Supply Electrical Supply Pipe run Minimum Fall PerPer Metre Run Minimum Fall 50mm per500mm min Minimum fall Run Flue Plume Displacement KitBelow windows or openings on pitched roofs 2000 Likely flue positions requiring a flue terminal guard Total equivalent length = +B+C+2x90Bends Flue Options Total Equivalent Length = +B+C+1x90Bend Flue Accessories Key Accessory Size Code NoTelescopic Flue inc. elbow Twin Flue Duct Adaptor Twin Flue ConnectionAir Duct Connection Flue Duct Connection Boiler Adaptor For Roof Terminals Flue DimensionsFlue Trim Terminal Guard Fig Plume Displacement Kit Fig Plume Displacement Determining Permissible Lengths 28/33Example Elbow 50mm General Fitting Notes30mm 60Ø extension piece. It must be secured using two Elbow to allow the flue to be installed as shownUsing a suitable bit e.g mm, drill through Extension and outlet. Secure using two of the screws Unpacking & Initial Preparation InstallationFlushing After considering the site requirements Fitting the Filling Loop Kit Fitting The Boiler Fitting the Safety Pressure Relief Discharge Pipe FigCondensate Drain see section Tighten all the connections Wall Thickness Flue Elbow Fitting The FlueEnsure Elbow is fully engaged into Boiler Adaptor Wall Thickness Waste Flue Inner Flue Support Bracket 25mm Extension Cut EndEnsure Extension is fully engaged into Boiler Adaptor Making The Electrical Connections Preliminary Electrical ChecksTerminal Block Cover Cable Clamp Commissioning Selector Switch DisplayCommissioning the Boiler Screw Pump Automatic Air Vent Temperature Control Gas Pressure Test Point Gas Valve Temperature Control Selector Switch DisplayCheck the Operational Working Gas Inlet Pressure It is necessary to set the boiler to ‘Calibration Mode’ Setting the Timer Completion CompletionCase Front Panel Facia Panel Servicing 13 .1 Annual ServicingAnnual Servicing Inspection 10 ±1 Electrode Position Changing Components Igniter FigSpark and Sensing Electrodes Fig Venturi Fig Fan FigInjector Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan Collector Burner Fig Insulation FigExtension Piece Safety Thermostat Fig Central Heating Temperature Sensor NTC FigDHW Temperature Sensor NTC Fig Flue/Heat Exchanger Thermostat Sensor Fig Pump Head Only Fig Pump Complete FigAutomatic Air Vent Fig Pressure Gauge Figs Hall Effect Sensor FigPressure Relief Valve Fig Plate Heat Exchanger Fig Diverter Valve Motor Unit & Assembly Fig 14.22 P.C.B. Fig Selector Switch Fig Expansion Vessel Fig Gas Valve Fig Setting the Gas Valve CO2 check Setting the Gas ValveFlue Adaptor Test Point Plug Analyser Probe CO2 should be 8.4% ± Reduce CO2 Electrical Illustrated Wiring Diagram Short Parts List Short Parts List426 315316 311 404419 422 400 415 Fault Finding Initial Fault Finding ChecksError Codes Go to section ‘A’ Turn the selector switch to Error 133 flashingReset position for 5 seconds Pump runs Turn Domestic Hot Water Error 133 flashing Go to section ‘I’Open DHW tap fully Close DHW tap Switch terminal PCB X3 connector terminals 3Fan jammed or faulty winding Replace PCB Replace water Replace sensor or PCB E28 Check wiring Viewing WindowGas at burner Replace gas valve Replace safety thermostat Replace PCB Is there 230V atReplace sensor Pages for Notes Pages for Notes GAS Boiler System Commissioning Checklist Service Record Potterton

Potthof & Co 24kw, 33kw PCB X3 connector terminals 3, Switch terminal, Replace water, Replace fan

Models: 24kw 28kw 33kw

18.0 Fault Finding

Fault Finding Solutions Sections

PCB - X3 connector terminals 3 & 4

switch terminal

Replace water

Fan jammed or faulty winding

Replace PCB

Replace fan