Worcester 18/25 Instruction Manual download pdf (Page 43)

FAULT FINDING

PROBLEM CAUSE REMEDY

LOCKOUT:

Pulsation on start CF - Flue draught incorrect CF - Check flue draught

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

Down draught Extend flue or fit an anti-downdraught

cowl (CF only)

Burner motor fails to

operate

Faulty motor or electrical supply

to motor

Check for 230V to motor during 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 CO

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

( Bentone burner 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

connections not properly made

Correct electrical control box

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 programmer

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

combustion head

Check with installation instructions

Faulty nozzle Replace nozzle

FAULT FINDING

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR DANESMOOR UTILITY 18/25

8 716 106 256C (03/2010)

FAULT FINDING

& DIAGRAMS

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

UNDER NO CIRCUMSTANCES MUST AN

APPLIANCE BE LEFT TO OPERATE WITH

ANY CONTROL LINKED OUT OR

OVERRIDDEN.

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Worcester 18/25 Instruction Manual Page 43

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