Fault Finding - Bosch Worcester Danesmoor 12/14 Installation And Servicing Instructions

15. Fault Finding

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
if necessary.
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.
Worn pump.
Air in pump.
Replace.
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LOCKOUT
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.
Faulty pump or
Faulty mechanical
faulty pump drive.
shut off valve.
Replace if necessary.
Clean or replace.
Electrical connections Faulty control box. Boiler thermostat
ignition. not properly Replace control box. faulty. Check by
made in linking out high
control box. limit and control
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 5.5°C ± 1.5°C.
Burner motor fails
to operate.
Photocell Faulty control box.
faulty. Replace if
Replace. necessary.
Check control box
Check electronic post purge
Check motor across
unit where fitted to CF low level
mains supply.
discharge systems.
BURNER FAILS TO START
Boiler does not respond to a call for heat.
Programmer
open circuit.
Check by linking
8 and 9 on the
thermostats. connector.
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
condition.
pushed fully home.
Boiler rating incorrect.
If overrated heat load
satisfied very quickly.
25
Intermittent Pulsation
lockout. on start.
Bad electrical Downdraught. Intermittent flame
connection. detection fault.
See flame detection
fault.
connections.
Extend flue above Fit a downdraught
eaves, or if possible cowl if flue cannot
above roof apex or be extended.
adjacent obstructions.
Control box fault.
Replace if necessary.
PULSATION ON START
Flue draught Faulty nozzle.
Faulty control Combustion
incorrect. Replace nozzle.
box. Replace settings
Check flue
if necessary. incorrect.
draught.
Set up as in
installation
instructions.
Oil pressure incorrect. Incorrect components Target wall incorrectly
Adjust to recommended used on combustion positioned or faulty
pressure settings. head. Check with installation
instructions.
OIL SMELLS
Oil soaked hearth. Odour in boiler room.
Faulty burner
operation.
Oil leaks pipe fittings. Leaks at tubing connectors.
Take apart and
remake if necessary. tubing is secure.
(where fitted).
Ensure end of