Riello 663 M Installation, Use And Maintenance Instructions page 32

SYMBOL FAULT
(1)
Uneven fuel supply
Internally rusted pump
Noisy pump, unstable pres-
sure
Pump unprimes after pro-
longed pause
Pump leaks gas oil
Smoke in flame - dark Bach-
arach
- yellow Bacharach
Dirty combustion head
During operation, the burner
I
stops in lock out
When the burner does not fire or comes to a halt following a
(1)
fault, the symbol which appears on control box 23)(Fig. 4 at
page 12) indicates the type of problem.
The fuse is located in the rear part of the control box
(2)
23)(Fig. 4 at page 12). A pull-out fuse is also available as a
spare part which can be fitted after breaking the tang on the
panel which holds it in place.
20033316
Faults - Possible causes - Solutions
PROBABLE CAUSE
Check if cause is in pump or fuel supply system
Water in tank
Air has entered the suction line
- Depression value too high (higher than 35 cm Hg):
Tank/burner height difference too great
Piping diameter too small
Suction filters clogged
Suction valves closed
Paraffin solidified due to low temperature
Return pipe not immersed in fuel
Air enters suction piping
Leakage from sealing organ
Not enough air
Nozzle worn or dirty
Nozzle filter clogged
Erroneous pump pressure
Flame stability disk dirty, loose, or deformed
Boiler room air vents insufficient
Too much air
Nozzle or filter dirty
Unsuitable nozzle delivery or angle
Loose nozzle
Impurities on flame stability disk
Erroneous head adjustment or not enough air
Blast tube length unsuited to boiler
Dirty or defective photocell
30 GB
SUGGESTED REMEDY
Feed burner from tank located near burner
Suck water from tank bottom with separate pump
Tighten connectors
Feed burner with loop circuit
Increase
Clean
Open
Add additive to light oil
Bring to same height as suction pipe
Tighten connectors
Replace pump
Adjust head and fan gate
Replace
Clean or replace
Adjust
Clean, tighten in place, or replace
Increase
Adjust head and fan gate
Replace
See recommended nozzles
Tighten
Clean
Adjust, open air damper
Contact boiler manufacturer
Clean or replace