Baxi Potterton Condensing Combination Boiler A, B, D, C

18.0 Fault Finding

Fault Finding Solutions Sections

Is there 230V at:

Main terminals L and N Check electrical supply

1. NO

Main terminal fuse Replace fuse Replace PCB

Display

illuminated

2. NO

PCB - X1 connector

terminals 1,2

Check wiring

3. NO

Pump Replace pump

1. YES

PCB - X3 connector terminals 3 & 4 Replace PCB

2. NO

Change pump supply cable

YES

CH system pressure less than 0.5 bar Re-pressurise system

1. YES

Check the tap of the automatic air

vent is opened Open the automatic air vent

2. NO

YES

Fan connections correct at fan. PCB -

X2 connector, is 230V AC across

terminals 5 & 7 Fan jammed or faulty winding

Replace PCB

Replace fan

YES

If pump jammed, release NO

Replace water

pressure switch

Check connection water pressure

switch terminal

COM - NO and PCB connector

X400 terminals 3,4

YES

Contents

Main 2 Natural Gas ISO 9001 FM 00866 Building Regulations and the Benchmark Commissioning Checklist Installer Notification Guidelines Legislation Codes of Practice - refer to the most recent version IMPORTANT - Installation, Commissioning, Service & Repair Safe Manual Handling CONTENTS 1.0 Introduction 1.1 Description 1.2 Optional Extras 1.3 Contents of Pack 2.0 General Layout 2.1 Layout 3.0 Appliance Operation 3.1 Central Heating Mode (Fig. 2) 3.2 Domestic Hot Water Mode (Fig. 3) 3.3 Frost Protection Mode 3.4 Pump Protection 4.0 Technical Data 4.1 Heatmax Combi 24, 28 & 33 Pump - Available Head SAP 2005 Seasonal Efficiency for all models is 91.1% SEDBUKDeclaration 5.0 Dimensions and Fixings Dimensions 6.1 Information 6.2 Central Heating Circuit 6.3 Bypass 6.4 System Control 6.5 System Filling and Pressurising 6.6 Expansion Vessel (Central Heating only) 6.7 Safety Pressure Relief Valve (Fig. 6) 6.8 Domestic Hot Water Circuit (Fig. 7) 6.9 Showers 6.10 Hard Water Areas 7.1 Location 7.2 Clearances (Figs. 8 & 9) 7.0 Site Requirement 7.3 Ventilation of Compartments 7.4 Gas Supply 7.5 Electrical Supply 7.6 Bath & Shower Rooms 7.7 Condensate Drain 7.7 Condensate Drain (cont.) 50mm per metre of pipe run 2.5 Minimum fall Page Page Horizontal Flues This bend is equivalent to 1 metre Total equivalent length = A+B+C+2x90Bends B AC This bend is equivalent to 1 metre 8.1 Horizontal Flue Systems Y C A X B 8.3 Flue Accessories 24 8.6 For Roof Terminals 8.7 Flue Dimensions 8.8 Flue Trim 8.9 Terminal Guard (Fig. 21) 9 .1 Plume Displacement Kit (Fig. 23) X Y 28/33 28/33 9.2 Determining Permissible Lengths 50mm 30mm 9.3 General Fitting Notes 9.3 General Fitting Notes (cont.) 30mm 70 10.1 Unpacking & Initial Preparation 10.2 Flushing 10.3 Fitting The Boiler 10.4 Fitting the Safety Pressure Relief Discharge Pipe (Fig. 44) 10.5 Condensate Drain (see section 7.7) 10.6 Fitting The Flue 10.6 Fitting the Flue (Cont) 10.7 Making The Electrical Connections 10.8 Preliminary Electrical Checks 11.0 Commissioning 11.1 Commissioning the Boiler x 2 Pressure 12.0 Completion 12.1 Completion 13.0 Servicing 13 .1 Annual Servicing 13.2 Annual Servicing - Inspection 13.0 Servicing 13.2 Annual Servicing - Inspection (Cont) 14.1 Igniter (Fig. 76) 14.2 Spark and Sensing Electrodes (Fig. 77) 14.3 Fan (Fig. 79) 14.4 Venturi (Fig. 78) 14.5 Injector (Fig. 78) 14.6 Burner (Fig. 81) 14.7 Insulation (Fig. 82) 14.8 Flue/Heat Exchanger Thermostat Sensor (Fig. 83) 14.9 Water Pressure Sensor (Fig. 85) 14.10 Central Heating Temperature Sensor (NTC) (Fig. 84) 14.11 Safety Thermostat (Fig. 85) 14.12 DHW Temperature Sensor (NTC) (Fig. 85) 14.14 Pump - Head Only (Fig. 87) 14.15 Pump - Complete (Fig. 88) 14.16 Automatic Air Vent (Fig. 89) 14.17 Pressure Gauge (Figs. 90 & 91) 14.18 Hall Effect Sensor (Fig. 92) 14.19 Safety Pressure Relief Valve (Fig. 93) 14.20 Plate Heat Exchanger (Fig. 94) 14.21 Diverter Valve - Motor Unit & Assembly (Fig. 95) 14.22 P.C.B. (Fig. 98) 14.23 Selector Switch (Fig. 98) 14.24 Gas Valve (Fig. 99) 14.25 Expansion Vessel (Fig. 101) 48 x 2 15.0 Setting the Gas Valve 15.1 Setting the Gas Valve (CO2check) 16.0 Electrical Baxi Heating UK Ltd 2012 16.1 Illustrated Wiring Diagram Mains Input Cable Link 17.0 Short Parts List 18.1 Initial Fault Finding Checks 18.2 Error Codes Page Page Fault Finding Solutions Sections A B D C E F H G I K J L M Page GAS BOILER SYSTEM COMMISSIONING CHECKLIST DOMESTIC HOT WATER MODE * CONTROLS ALL SYSTEMS CENTRAL HEATING MODE Service Record Service Provider Service 1 Service 2 Service 3 Service 4 Service 5 Service 6