Fault - Probable Cause - Suggested Remedy - Riello 974 T Installation, Use And Maintenance Instructions

SIGNAL FAULT
No blink The burner does not
start
4 x blinks The burner starts and
then goes into lock-out
2 x blinks After pre-purge and the
safety time, the burner
goes to lock-out at the
end of the safety time
7 x blinks Flame detachment
The burner does not
pass to 2nd stage
Fuel passes to 2nd
stage but air remains in
1st
Burner stops at transi-
tion between 1st and
2nd stage. Burner
repeats starting cycle.
Uneven fuel supply
Internally rusted pump
Noisy pump, unstable
pressure
Pump unprimes after
prolonged pause
Pump leaks light oil
Smoke in flame
- dark Bacharach
- yellow Bacharach
Dirty combustion head
10 x blinks
PROBABLE CAUSE
1 - No electrical power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . Close all switches - Check fuses
2 - A limit or safety control device is open . . . . . . . . . . . . . . . . . . . Adjust or replace
3 - Control box lock-out . . . . . . . . . . . . . . . . . . . . . . . . . . . Reset control box (no sooner than 10 s
4 - Pump is jammed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
5 - Erroneous electrical connections . . . . . . . . . . . . . . . . . . . . . . . Check connections
6 - Defective control box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
7 - Defective electrical motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
8 - Photocell short-circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace photocell
9 - Light is entering or flame is simulated. . . . . . . . . . . . . . . . . . . . Eliminate light or replace control box
10 - No fuel in tank; water on tank bottom . . . . . . . . . . . . . . . . . . . . Top up fuel level or suck up water
11 - Inappropriate head and air damper adjustments. . . . . . . . . . . . Adjust, see page 6 and 9
12 - Light oil solenoid valves fail to open (1st stage or safety) . . . . . Check connections; replace coil
13 - 1st nozzle clogged, dirty, or deformed. . . . . . . . . . . . . . . . . . . . Replace
14 - Dirty or poorly adjusted firing electrodes . . . . . . . . . . . . . . . . . . Adjust or clean
15 - Grounded electrode due to broken insulation . . . . . . . . . . . . . . Replace
16 - High voltage cable defective or grounded . . . . . . . . . . . . . . . . . Replace
17 - High voltage cable deformed by high temperature . . . . . . . . . . Replace and protect
18 - Ignition transformer defective . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
19 - Erroneous valves or transformer electrical connections . . . . . . Check
20 - Control box defective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
21 - Pump unprimed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prime pump and see "Pump unprimes"
22 - Pump/motor coupling broken . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
23 - Pump suction line connected to return line . . . . . . . . . . . . . . . . Correct connection
24 - Valves up-line from pump closed . . . . . . . . . . . . . . . . . . . . . . . Open
25 - Filters dirty: line - pump - nozzle . . . . . . . . . . . . . . . . . . . . . . . . Clean
26 - Defective photocell or control box . . . . . . . . . . . . . . . . . . . . . . . Replace photocell or control box
27 - Dirty photocell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clean
28 - 1st stage operation of cylinder is faulty . . . . . . . . . . . . . . . . . . . Change the cylinder
29 - Motor protection tripped . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reset thermal cut-out
30 - Defective motor command control device . . . . . . . . . . . . . . . . . Replace
31 - Missing phase thermal cut-out trips . . . . . . . . . . . . . . . . . . . . . Reset thermal cut-out
32 - Incorrect motor rotation direction . . . . . . . . . . . . . . . . . . . . . . . Change motor electrical connections
33 - Poorly adjusted head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust, see page 6, fig. (F)
34 - Poorly adjusted or dirty firing electrodes . . . . . . . . . . . . . . . . . . Adjust, see page 6, fig. (B)
35 - Poorly adjusted fan air gate: too much air . . . . . . . . . . . . . . . . Adjust
36 - 1st nozzle is too big (pulsation). . . . . . . . . . . . . . . . . . . . . . . . . Reduce 1st nozzle delivery
37 - 1st nozzle is too small (flame detachment) . . . . . . . . . . . . . . . . Increase 1st nozzle delivery
38 - 1st nozzle dirty, or deformed . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
39 - Inappropriate pump pressure . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust to between 10 and 14 bar
40 - 1st stage nozzle unsuited to burner or boiler . . . . . . . . . . . . . . See Nozzle Table, page 5; reduce 1st stage
41 - Defective 1st stage nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
42 - Control device TR does not close . . . . . . . . . . . . . . . . . . . . . . . Adjust or replace
43 - Defective control box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
44 - 2nd stage sol. valve coil defective. . . . . . . . . . . . . . . . . . . . . . . Replace
45 - Piston jammed in valve unit . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace entire unit
46 - Low pump pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Increase
47 - 2nd stage operation of cylinder is faulty . . . . . . . . . . . . . . . . . . Change cylinder
48 - Nozzle dirty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Renew nozzle
49 - Photocell dirty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clean
50 - Excess air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reduce
51 - Check if cause is in pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Feed burner from tank
or fuel supply system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . located near burner
52 - Water in tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Suck water from tank bottom with separate
pump
53 - Air has entered the suction line . . . . . . . . . . . . . . . . . . . . . . . . Tighten connectors
- Depression value too high (higher than 35 cm Hg):
54 - Tank/burner height difference too great. . . . . . . . . . . . . . . . . . . Feed burner with loop circuit
55 - Piping diameter too small . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Increase
56 - Suction filters clogged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clean
57 - Suction valves closed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Open
58 - Paraffin solidified due to low temperature . . . . . . . . . . . . . . . . . Add additive to light oil
59 - Return pipe not immersed in fuel . . . . . . . . . . . . . . . . . . . . . . . Bring to same height as suction pipe
60 - Air enters suction piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tighten connectors
61 - Leakage from sealing organ . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace pump
62 - Not enough air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust head and fan gate, see page 6 and 9
63 - Nozzle worn or dirty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
64 - Nozzle filter clogged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clean or replace
65 - Erroneous pump pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust to between 10 - 14 bar
66 - Flame stability spirat dirty, loose, or deformed . . . . . . . . . . . . . Clean, tighten in place, or replace
67 - Boiler room air vents insufficient . . . . . . . . . . . . . . . . . . . . . . . . Increase
68 - Too much air. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust head and fan gate, see page 6 and 9
69 - Nozzle or filter dirty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
70 - Unsuitable nozzle delivery or angle. . . . . . . . . . . . . . . . . . . . . . See recommended nozzles, page 5
71 - Loose nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tighten
72 - Impurities on flame stability spiral . . . . . . . . . . . . . . . . . . . . . . . Clean
73 - Erroneous head adjustment or not enough air . . . . . . . . . . . . . Adjust, see page 9; open gate valve
74 - Blast tube length unsuited to boiler . . . . . . . . . . . . . . . . . . . . . . Contact boiler manufacturer
75 - Connection or internal fault
14
SUGGESTED REMEDY
after the lock-out)
when third phase is re-connected