Bosch Appliances 18/25, 25/32kW, 12/18 instruction manual Fault Finding

Page 45

PROBLEM

 

CAUSE

 

REMEDY

 

 

 

 

 

 

 

 

LOCKOUT:

 

 

 

 

 

Pulsation on start

 

Combustion settings incorrect

 

Set up as in installation instructions

 

 

Faulty nozzle

 

Replace nozzle

Intermittent lockout

 

Bad electrical connection

 

Check control box/electrical connections

 

 

Intermittent flame detection fault

 

See flame detection fault

Burner motor fails to

 

Faulty motor or electrical supply

 

Check for 230v at motor plug during

operate

 

to motor

 

startup period

 

 

Control box fault

 

Replace control box

Flame detection

 

Photocell filmed over (dirty)

 

Wipe clean

fault

 

Photocell faulty

 

Replace

 

 

Control box faulty

 

Replace

Incorrect CO2

 

Air adjustment fault

 

Set up as in installation instructions

 

 

Oil pressure incorrect

 

Set up as in installation instructions

No oil from nozzle

 

No oil at pump

 

Check and refill oil tank/bleed oil line

 

 

 

 

Check and clean filters & valves from oil

 

 

 

 

tank to boiler

 

 

Air in pump

 

Bleed pump

 

 

Nozzle blocked

 

Replace nozzle

 

 

Faulty pump or drive

 

Replace

 

 

Faulty mechanical shut off valve

 

Clean or replace

 

 

(12/18 & 18/25 only)

 

 

 

Ignition failure

 

Electrode settings incorrect

 

Set up as in installation instructions

 

 

Faulty ignition transformer

 

Replace

 

 

Open circuit ignition

 

Check and replace electrodes or high

 

 

 

 

tension leads if necessary

 

 

Faulty control box or electrical

 

Correct control box electrical

 

 

connections not properly made

 

connections or replace control box

 

 

 

 

 

 

BURNER FAILS

 

No power to boiler

 

Check electrical / control circuit

TO START

 

Faulty boiler thermostat

 

Check by temporarily linking out high

 

 

 

 

limit and control thermostats

 

 

Programmer open circuit

 

Check by temporarily linking 8 & 9 on

 

 

 

 

the connector

 

 

Faulty control box

 

Replace

 

 

 

 

 

 

HIGH SMOKE

 

Air intake/flue blocked

 

Check & clear air intake/flue

NUMBER

 

Incorrect combustion settings

 

Set up as in installation instructions

 

 

Oil pressure incorrect

 

Adjust to correct pressure

 

 

Incorrect components used on

 

Check with installation instructions

 

 

combustion head

 

 

 

 

 

Faulty nozzle

 

Replace nozzle

 

 

 

 

 

 

FAULT FINDING

BOILER LOCKOUT :

Indicated by the illumination of the 'Lockout' indicator on the fascia.

To reset, wait 2 minutes then press the lockout reset button.

Also refer to fault finding logic on pages 46 and 47.

FAULT FINDING

& DIAGRAMS

UNDER NO CIRCUMSTANCES MUST AN APPLIANCE BE LEFT TO OPERATE WITH ANY CONTOL LINKED OUT OR OVERRIDDEN.

44

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32 8 716 106 252b (07/06

FAULT FINDING

Page 44 Page 46
Image 45
Page 44 Page 46
Contents Greenstar Heatslave External 12/18, 18/25, 25/32kW Installation & Servicing Instructions Installation & Servicing InstructionsContents Installation Regulations Safety PrecautionsSafety Precautions Installation Regulations OIL SMELLS, Leaks or Fumes from the ApplianceGeneral Information General InformationStandard Package Technical Data Technical DataDescription BSPLayout & Components Layout & ComponentsCleaning Primary Systems Cleaning Primary SystemsMains Supplies Mains SuppliesMains Water Expansion Vessel Electric SupplyOIL Supply OIL SupplyG J HeadWater Systems & Pipework Water Systems & PipeworkFilling Primary Sealed Systems SHOWERS/BIDETSDomestic HOT Water Condensate Pressure Relief Pipework Condensate Pressure Relief PipeworkCondensate Pipework Pressure Relief PipeworkBoiler Location Boiler Location ClearancesClearances FrontCabinet Mounted LOW Level Flue Terminal Positions Cabinet Mounted LOW Level Flue Terminal PositionsTerminal Position Positions High Level Flue TerminalHigh Level Flue Terminal PositionsBalanced External Oilfit Balanced External Oilfit Flue OptionsFlue Options AC DCabinet Mounted Balanced Horizontal Flue OptionsBalanced Flue Options Lifting and Carrying Precautions Unpacking the BoilerUnpacking the Boiler Safety Pipework & Flue PositionsPipework & Flue Positions Boiler Installation Boiler InstallationFlue Installation Flue InstallationInstallation Notes Combustion Chamber Combustion ChamberHor Plan sectional view Hook the retainer J over the end two bafflesPipework Connections Pipework ConnectionsWater Connections OIL Supply ConnectionsPressure Relief Connection Condensate ConnectionOIL Burner & Pump OIL Burner & PumpOIL Burner OIL PumpRefitting Components Refitting ComponentsPlug burner lead E into control box F Programmer External Electrics MainsBoard ElectricsBlue Green/Yellow Br BrownRed WhitePRE-COMMISSIONING Checks Appliance PRE-COMMISSIONINGChecks Appliance Filling the System Filling the SystemStarting the Appliance Starting the ApplianceSafely dispose of the container/discharge Boiler lockout indicator on Pressure adjustment Vacuum gauge port 25/32Bleed & pressure gauge port Holder with oilBurner should be OFF and the circulating pump on Set the room thermostat to minimum Central heating Open all radiator valvesWater Treatment Water TreatmentPump and all radiators Finishing Commissioning Finishing CommissioningAppliance Inspection and Service Inspection and ServiceRoutine servicing Loosen clip D to detach air duct3.0mm Clean both sides of the fan impeller Clean the BurnerThoroughly clean any deposits Any debris and clean if necessaryFront 11.5 18.6 50 80EH55 80EH 12.0 22.2Short Parts List 12/18 Short Parts List 12/18Auto reset High Limit thermostat Part Number 8 716 107 640 Burner SterlingShort Parts List 18/25 Short Parts List 18/25Manifold access cover seal Short Parts List 25/32 Short Parts List 25/32Fault Finding Fault FindingFaulty Boiler Operation Problem Cause RemedyNoisy operation Pump noise from air in pump or OIL SmellsNeutral N and the pin, wire or Base of the control box before replacing any componentsMeasure all 230V tests between Control BOX Logic for 535 SE/LD RDB Fault FindingElectrical SchematicOIL Boiler Combustion Record Service 1 Date Excellence Comes AS Standard General checks

25/32kW, 12/18, 18/25 specifications

Bosch Appliances has carved out a reputation for engineering high-performance heating solutions, particularly with their range of heating systems including the 18/25, 12/18, and 25/32 kW models. These systems are designed to meet the diverse needs of residential and commercial spaces while maintaining energy efficiency and sustainability.

The Bosch 18/25 kW model excels in providing an optimal heating solution for medium to large residential properties. It is equipped with a highly efficient condensing boiler that extracts additional heat from flue gases, achieving significant energy savings. The built-in, user-friendly interface allows for easy programming and monitoring, which maximizes user convenience.

The 12/18 kW model provides a versatile opportunity for smaller homes or apartments. Its compact design ensures that it fits seamlessly into tighter spaces without sacrificing performance. The unit operates quietly, making it an excellent choice for residential areas where noise can be a concern. Additionally, it features the latest modulation technology, optimizing energy usage and maintaining consistent temperatures.

Finally, the 25/32 kW model is ideal for larger installations, offering robust performance even in high-demand scenarios. This model benefits from advanced heating management systems that enable intelligent control of heating zones, ensuring efficiency and comfort throughout the property. With its enhanced energy rating, the 25/32 kW model significantly reduces the carbon footprint, aligning with modern sustainability goals.

Across the board, Bosch Appliances integrates advanced technologies such as intelligent diagnostics, smart home compatibility, and eco-friendly materials. All models are constructed with durability in mind, featuring corrosion-resistant heat exchangers and high-quality components designed for longevity.

The customer-focused features, including comprehensive warranty packages and responsive customer service, further exemplify Bosch's commitment to quality. Overall, Bosch Appliances 18/25, 12/18, and 25/32 kW heating systems stand out for their innovative technology, efficient performance, and reliability, making them an excellent choice for those looking to upgrade their heating solutions.
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