Fault Finding & Diagnosis; Fault Finding - Worcester GREENSTAR HEATSLAVE 12/18 Instruction Manual

PROBLEM
LOCKOUT:
Pulsation on start
Intermittent lockout
Burner motor fails to
operate
Flame detection
fault
Incorrect CO
2
No oil from nozzle
Ignition failure
BURNER FAILS
TO START:
HIGH SMOKE
NUMBER:
50

FAULT FINDING

CAUSE
CF - Flue draught incorrect
Combustion settings incorrect
Faulty nozzle
Bad electrical connection
Intermittent flame detection fault
Down draught
Faulty motor or electrical supply
to motor
Control box fault
Photocell filmed over (dirty)
Photocell faulty
Control box faulty
Air adjustment fault
Oil pressure incorrect
No oil at pump
Air in pump
Nozzle blocked
Faulty pump or drive
Faulty mechanical shut off valve
(12/18 & 18/25 only)
Electrode settings incorrect
Faulty ignition transformer
Open circuit ignition
Faulty control box or electrical
connections not properly made
No power to boiler
Faulty boiler thermostat
Programmer open circuit
Faulty control box
Air intake/flue blocked
Incorrect combustion settings
Oil pressure incorrect
Incorrect components used on
combustion head
Faulty nozzle
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE 12/18-18/25-25/32
REMEDY
CF - Check flue draught
Set up as in installation instructions
Replace nozzle
Check control box/electrical connections
See flame detection fault
Extend flue or fit an anti-downdraught
cowl (CF only)
Check for 230V to motor during startup
period
Replace control box
Wipe clean
Replace
Replace
Set up as in installation instructions
Set up as in installation instructions
Check and refill oil tank/bleed oil line
Check and clean filters & valves from oil
tank to boiler
Bleed pump
Replace nozzle
Replace
Clean or replace
Set up as in installation instructions
Replace
Check and replace electrodes or high
tension leads if necessary
Correct electrical control box
connections or replace control box
Check electrical / control circuit
Check by temporarily linking out high
limit and control thermostats
Check by temporarily linking 8 & 9 on
the connector
Replace
Check & clear air intake/flue
Set up as in installation instructions
Adjust to correct pressure
Check with installation instructions
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
50 and 51
UNDER NO CIRCUMSTANCES MUST AN
APPLIANCE BE LEFT TO OPERATE WITH
ANY CONTROL LINKED OUT OR
OVERRIDDEN.
6 720 802 432 issue A 04/2012