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9
Faults - Possible causes - Solutions
Find a list of faults, causes and possible solutions for a set of failures that may occur and result in irregular burner operation or no
functioning at all.
If a burner malfunction is detected, first of all:
•
check that the electrical wiring is adequately connected;
•
check whether fuel is delivered;
•
check that every adjustment parameter is adequately set.
SYMBOL
FAULT
(1)
The burner does not start
The burner does not start and
a function lock-out occurs
The burner starts but stops at
maximum air damper setting
The burner starts and then
goes into lock-out
The burner remains in pre-
purging phase
After pre-purge and the safety
1
time, the burner goes to lock-
out and the flame does not
appear
The flame ignites normally but
the burner locks out when the
safety time has elapsed
Firing with pulsations or flame
detachment, delayed firing
The burner does not pass to
2nd stage
Uneven fuel supply
20036074
Faults - Possible causes - Solutions
PROBABLE CAUSE
A limit or safety control device is open
Control box lock-out
Oil pressure switch intervenes
Motor protection tripped (RL 38-50/M)
No electrical power supply
Control box fuse blown
Contact II of servomotor does not operate, control
box terminals 11 - 8
Pump is jammed
Defective capacitor (RL 28/M)
Defective motor command control device
(RL 38-50/M)
Defective control box
Defective electrical motor
Flame simulation
Photocell short-circuit
Missing phase (RL 38-50/M) thermal cut-out trips
Contact I of servomotor does not operate, control
box terminals 9-8
Fault in flame detection circuit
Contact III of servomotor does not operate, con-
trol box terminals 10-8
No fuel in tank; water on tank bottom
Inappropriate head and air damper adjustments
gas oil solenoid valves fail to open
Nozzle clogged, dirty, or deformed
Dirty or poorly adjusted firing electrodes
Grounded electrode due to broken insulation
High voltage cable defective or grounded
High voltage cable deformed by high temperature Replace and protect
Ignition transformer defective
Erroneous electrical connections of valves or
transformer
Defective control box
Pump unprimed
Pump/motor coupling broken
Pump suction line connected to return line
Valves up-line from pump closed
Filters dirty: line - pump - nozzle
Incorrect motor rotation direction
Defective photocell or control box
Dirty photocell
Poorly adjusted head
Poorly adjusted or dirty firing electrodes
Poorly adjusted fan air gate: too much air
Nozzle unsuited for burner or boiler
Defective nozzle
Inappropriate pump pressure
Control device TR does not close
Defective control box
Check if cause is in pump or fuel supply system
GB
28
SUGGESTED REMEDY
Adjust or replace
Reset control box
Adjust pressure switch or eliminate overpressure
Reset thermal cut-out
Close all switches - Check connections
Replace
(2)
Adjust cam II or replace servo-motor
Replace
Replace
Replace
Replace
Replace
Replace control box
Replace photocell
Reset thermal cut-out when third phase is re-con-
nected
Adjust cam I or replace servomotor
Replace control box
Adjust cam III or replace servomotor
Top up fuel level or suck up water
Adjust
Check connections; replace coil
Replace
Adjust or clean
Replace
Replace
Replace
Check
Replace
Prime pump and see "Pump unprimes" (54-55)
Replace
Correct connection
Open
Clean
Change motor electrical connections
Replace photocell or control box
Clean
Adjust
Adjust
Adjust
See Nozzle Table
Replace
Adjust
Adjust or replace
Replace
Feed burner from tank located near burner
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