Bosch DANESMOOR UTILITY 32-50 Instruction Manual download pdf (Page 47)

FAULT FINDING

PROBLEM CAUSE REMEDY

FAULTY BOILER

OPERATION:

Noisy operation Pump noise from air in pump or

worn pump

Bleed air from pump or replace pump

Worn motor bearings Replace motor

Fan out of balance Replace fan

Boiling Faulty boiler thermostat Replace if necessary

Short circuit boiler thermostat Temporarily take out of circuit to check

Thermostat bulb not fully home in

pocket

Ensure bulb is pushed fully home

No primary water circulation Check system / circulating pump

Short Cycling Burner rating incorrect Correct burner rating

Boiler thermostat differential

incorrect

Replace boiler thermostat

External controls not operating

correctly

Check and correct external controls

OIL SMELLS: Blocked flue, fumes on startup CF - Check flue with gauge and check

seals/gaskets

RS - Check seals/gaskets

Oil soaked boiler, faulty burner

operation, numerous lockouts

Rectify burner operation and lockouts

Odour in boiler room, oil leaks

from pipework, flexible hoses

connections

Rectify oil leaks, replace components i

necessary

FAULT FINDING

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR UTILITY 32/50 & 50/708 716

109 711B 07.2010

FAULT FINDING

& DIAGRAMS

8 716 109 711 b 07.10 14/7/10 09:59 Page 47

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Bosch DANESMOOR UTILITY 32-50 Instruction Manual Page 47