Faults - Possible Causes - Solutions - Riello RL 42 BLU Installation, Use And Maintenance Instructions

8

Faults - Possible causes - Solutions

Find a list of faults, causes and possible solutions for a set of fail-
ures that may occur and result in irregular burner operation or no
functioning at all.
If a burner malfunction is detected, first of all:
Signal Fault
No blink The burner does not start
2 x blinks After pre-purge and the
safety time, the burner
goes to lock-out at the
end of the safety time
4 x blinks The burner starts and then
goes into lock-out
7 x blinks Flame detachment
The burner does not pass to
nd
2 stage
Fuel passes to 2
air remains in 1st
Burner stops at transition
st
between 1 and 2
Burner repeats starting
cycle.
Uneven fuel supply
Faults - Possible causes - Solutions
Probable cause
No electrical power supply . . . . . . . . . . . . . . . . . . . . . . . . . . Close all switches - Check fuses
A limit or safety control device is open . . . . . . . . . . . . . . . . . Adjust or replace
Control box lock-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reset control box (no sooner than 10 s af-
Pump is jammed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
Erroneous electrical connections . . . . . . . . . . . . . . . . . . . . . Check connections
Defective control box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
Defective electrical motor . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
Servomotor faulty or wrongly adjusted . . . . . . . . . . . . . . . . . Adjust or replace
No fuel in tank; water on tank bottom . . . . . . . . . . . . . . . . . . Top up fuel level or suck up water
Inappropriate head and air damper adjustments . . . . . . . . . Adjust
Light oil solenoid valves fail to open (1
1st nozzle clogged, dirty, or deformed . . . . . . . . . . . . . . . . . Replace
Dirty or poorly adjusted firing electrodes . . . . . . . . . . . . . . . Adjust or clean
Grounded electrode due to broken insulation . . . . . . . . . . . . Replace
High voltage cable defective or grounded . . . . . . . . . . . . . . Replace
High voltage cable deformed by high temperature . . . . . . . . Replace and protect
Ignition transformer defective . . . . . . . . . . . . . . . . . . . . . . . . Replace
Erroneous valves or transformer electrical connections . . . . Check
Control box defective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
Pump unprimed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prime pump and see "Pump unprimes"
Pump/motor coupling broken . . . . . . . . . . . . . . . . . . . . . . . . Replace
Pump suction line connected to return line . . . . . . . . . . . . . . Correct connection
Valves up-line from pump closed . . . . . . . . . . . . . . . . . . . . . Open
Filters dirty: line - pump - nozzle . . . . . . . . . . . . . . . . . . . . . . Clean
Defective photocell or control box. . . . . . . . . . . . . . . . . . . . . Replace photocell or control box
Dirty photocell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clean
st
1 stage operation of cylinder is faulty . . . . . . . . . . . . . . . . . Change the cylinder
Motor protection tripped . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reset thermal cut-out
Defective motor command control device. . . . . . . . . . . . . . . Replace
Missing phase thermal cut-out trips . . . . . . . . . . . . . . . . . . . Reset thermal cut-out when third phase is
Incorrect motor rotation direction . . . . . . . . . . . . . . . . . . . . . Change motor electrical connections
Servomotor faulty or wrongly adjusted . . . . . . . . . . . . . . . . . Adjust or replace
Photocell short-circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace photocell
Light is entering or flame is simulated . . . . . . . . . . . . . . . . . Eliminate light or replace control box
Poorly adjusted head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust
Poorly adjusted or dirty firing electrodes. . . . . . . . . . . . . . . . Adjust
Poorly adjusted fan air gate: too much air . . . . . . . . . . . . . . Adjust
st
1 nozzle is too big (pulsation) . . . . . . . . . . . . . . . . . . . . . . . Reduce 1
st
1 nozzle is too small (flame detachment) . . . . . . . . . . . . . . Increase 1
st
1 nozzle dirty, or deformed . . . . . . . . . . . . . . . . . . . . . . . . . Replace
Inappropriate pump pressure . . . . . . . . . . . . . . . . . . . . . . . . Adjust to between 10 and 14 bar
st
1 stage nozzle unsuited to burner or boiler . . . . . . . . . . . . See nozzle table reduce 1
st
Defective 1 stage nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
Control device TR does not close . . . . . . . . . . . . . . . . . . . . . Adjust or replace
Defective control box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
nd
2 stage sol. valve coil defective . . . . . . . . . . . . . . . . . . . . . Replace
Piston jammed in valve unit . . . . . . . . . . . . . . . . . . . . . . . . . Replace entire unit
Servomotor faulty or wrongly adjusted . . . . . . . . . . . . . . . . . Adjust or replace
nd
stage but Low pump pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Increase
nd
2 stage operation of cylinder is faulty . . . . . . . . . . . . . . . . Change cylinder
Nozzle dirty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Renew nozzle
nd
stage. Photocell dirty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clean
Excess air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reduce
Check if cause is in pump or fuel supply system . . . . . . . . . Feed burner from tank located near burn-
• check that the electrical wiring is adequately connected;
• check whether fuel is delivered;
• check that every adjustment parameter is adequately set.
st
stage or safety) . . . Check connections; replace coil
25 GB
Suggested remedy
ter the lock-out)
re-connected
st
nozzle delivery
st
nozzle delivery
st
stage
er
20023224