16
2009-03
RVR
Energy Technology Experts
Troubleshooting
Alarm reset
Switch off the current to the burner for approx. 10 seconds.
Current must always be switched off when addressing a fault
in the burner. When work is complete, the alarm is automati-
cally reset when the burner goes live again.
Troubleshooting
For all types of fault, the burner's basic functions must be be
checked fi rst:
•
Is the operation light on, the burner's main switch in on position?
•
Is the burner's fuse intact?
•
is the burner receiving a current?
•
Are all control units, thermostat etc, properly set and adjusted?
•
Are all safety devices, overheating guards, safety gates etc, function-
ing normally?
•
Is the burner receiving pellets?
If the cause of the fault is not listed above, all of the burner's
functions must be checked. If the burner is in alarm mode, the
alarm indicator lights up and this has to be reset.
Observe the burner's behaviour. When troubleshooting, a meas-
uring instrument can be very useful.
Other reasons for faults
Common circumstances which give rise to problems:
•
the screw feeder's slope from the horizontal plane is not 40°±5°.
•
pellets do not comply with standard.
•
draught >20Pa.
•
no contrafl ow hatch.
•
large area in waste gas fl ue.
•
irregular fuel feed due to screw feeder not going far enough.
•
incorrect placement of fi re grate.
20
Risk of snaring.
Do not place your hands or objects inside the screw feeder.
The feeder cable should be decoupled from the the burner
before any adjustments are made to the screw feeder.
Alarm indicator/alarm
Light constant.
High temperature in down-
pipe
1 long + two short
fl
ashes.
Failed start.
The burner stops 10 minutes
after the thermostat de-
mands heat.
1 long + 3 short
fl
ashes.
High ambient temperature,
>50°C.
1 long + 4 short
fl
ashes.
Fan not working.
1 long + 5 short
fl
ashes.
Overpressure in burner, can
only arise at the start.
Continual
fl
ashing.
Start element not working.
All indicators are
fl
ashing
Probable cause
Remounted
fl
ue.
Too much ash and soot in burner and burner
chamber.
Draught too great, or area in waste gas
fl
ue
too large.
No feeding of pellets to the burner.
Too much ash in grate.
Photocell smudged / worn.
Too much ash and soot in burner and burner
chamber.
High ambient temperature, poss. due to badly
insulated boiler hatch.
Worn temperature indicator.
Dirt in fan.
Fan worn.
Too much ash and soot in burner and burner chamber.
Blockage in
fl
ue / damper shut.
Semi-conductor relay, or circuit board, damaged,
green indicator on relay does not light up at start.
Ignition element damaged, green indicator on
semi-conductor relay lights up at start.
Burner equipped with temperature indicator.
Boiler thermostat has lower temperature set-
ting than burner
Actions
Check draught, de-soot if required.
Clean burner and boiler, reset temperature de-
limiter.
Check.
Check that there are pellets in the supply unit,
that the screw is functioning and that pellets
can fall down into burner.
Clean burner.
Clean / change photocell.
Clean burner and boiler, check draught.
Check ambient temperature, max. 30°C,
check.
Change circuit board.
Clean and check that the fan us running smoothly.
Change fan if alarm reappears.
Clean burner and boiler.
Check draught, clean the
fl
ue, open the
damper.
Check that the relay is live, 24V=, from circuit
board. Change circuit board or relay.
Measure element for resistance , approx. 176
Ω
/ loop. Change element in event of interruption.
Raise temperature in boiler's thermostat , or
set for burner's temperature setting, so that it
does not approach the boiler thermostat's tem-
perature setting.
Switch off the current to the burner and remove the the plug
before cleaning, servicing, or before the burner is removed from
the boiler.
ALARM
High temperature in downpipe
–
Failed
start
–••
High ambient temperature
–•••
Fan not working
–••••
Overpressure burner chamber
–•••••
Start element not working
••••••••