Fault Finding - Worcester 50/70 Installation And Servicing Instructions

Ignition failure No oil delivery
from nozzle.
Check oil supply
at oil pump.
Oil at No oil at
oil pump. oil pump.
No oil in tank.
Filters or oil line
Check tank and
blocked. Check
replenish if filters from tank
necessary. to boiler and clean
Air in pump. Nozzle blocked.
Bleed pump. Replace nozzle.
IGNITION FAILURE
Electrode Faulty ignition Open circuit
settings transformer.
incorrect. Replace
See installation if necessary.
instructions.
Electrodes
broken.
FAULTY BOILER OPERATION
Noisy operation.
Pump noise. Worn motor bearings. Fan out of balance.
Replace motor. Replace fan.
Air in pump. Worn pump.
Replace.
INDICATED BY RED LAMP ON CONTROL BOX
To Re-set wait 2 minutes and press re-set button
Air adjustment fault.
Flame detection fault.
CO should be
2
as specified in
tables 2 to 4.
Photocell
filmed over.
Clean.
if necessary.
Faulty pump or
faulty pump drive.
Replace if necessary.
Electrical connections Faulty control box.
ignition. not properly Replace control box.
made in
control box.
High tension
leads faulty.
Faulty nozzle.
Replace nozzle.
Boiling.
Faulty boiler thermostat. Short circuit boiler thermostat.
Replace if necessary. Take out of circuit to check.
External controls not Boiler thermostat
operating correctly. differential incorrect.
Should be 5°C ± 2°C.
LOCKOUT
Burner motor fails
to operate.
Photocell Faulty control box.
faulty. Replace if
Replace. necessary.
Check motor across Control box fault.
mains supply. Replace if necessary.
BURNER FAILS TO START
Boiler does not respond to a call for heat.
Boiler thermostat Programmer
faulty. Check by open circuit.
linking out high
limit and control
thermostats.
HIGH SMOKE NUMBER
Air intake blocked. Incorrect combustion
Check air intake is clear. settings. Readjust as in
installation instructions.
Short cycling.
Fumes on start-up.
Blocked flue.
Check flue with gauge.
Thermostat bulb not fully
Numerous lockouts.
home in pocket.
Cure the lockout
Ensure bulb is
pushed fully home.
Boiler rating incorrect.
If overrated heat load
satisfied very quickly.
Intermittent Pulsation
lockout.
Bad electrical Downdraught. Intermittent flame
connection. detection fault.
See flame detection
fault.
Check control box
connections.
Extend flue above Fit a downdraught
eaves, or if possible cowl if flue cannot
above roof apex or be extended.
adjacent obstructions.
PULSATION ON START
Faulty control Flue draught Combustion Faulty nozzle.
Replace nozzle.
box. Replace incorrect. settings
if necessary. Check flue incorrect.
draught. Set up as in
installation
instructions.
Oil pressure incorrect. Incorrect components
Adjust to recommended used on combustion
pressure settings. head. Check with installation
instructions.
OIL SMELLS
Oil soaked hearth. Odour in boiler room.
Faulty burner
operation.
condition.
Oil leaks pipe fittings. Leaks at tubing connectors.
Take apart and
remake if necessary.
on start.
Target wall incorrectly
positioned or faulty
(where fitted).
Ensure end of
tubing is secure.