PROBLEM

CAUSE

REMEDY

FAULT FINDING

FAULTY BOILER

 

 

 

 

OPERATION:

 

 

 

 

Noisy operation

Pump noise from air in pump or

Bleed air from pump or replace pump

 

 

worn pump

 

 

 

 

Worn motor bearings

Replace motor

 

 

Fan out of balance

Replace fan

 

Boiling

Faulty boiler thermostat

Replace if necessary

 

 

Short circuit boiler thermostat

Take out of circuit to check

 

 

Thermostat bulb not fully home in

Ensure bulb is pushed fully home

 

 

pocket

 

 

 

 

No primary water circulation

Check system / circulating pump

 

Short Cycling

Burner rating incorrect

Correct burner rating

 

 

Boiler thermostat differential

Replace boiler thermostat

 

 

incorrect

 

 

 

 

External controls not operating

Check and correct external controls

 

 

correctly

 

 

 

 

 

 

 

 

OIL SMELLS:

Blocked flue, fumes on startup

Check seals/gaskets

 

 

Oil soaked boiler, faulty burner

Rectify burner operation and lockouts

 

 

operation, numerous lockouts

 

 

 

 

Odour in cabinet, oil leaks from

Rectify oil leaks, replace components if

 

 

pipework, flexible hoses

necessary

 

 

connections

 

 

 

FAULT FINDING

& DIAGRAMS

45

FAULT FINDING

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32 8 716 113 389b (09/07)

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Bosch Appliances 25/32kW Problem Cause Remedy, Faulty Boiler Operation, Noisy operation Pump noise from air in pump or

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.

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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.

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