Baxi TECNO 70-L Installation, Use And Maintenance Instructions page 28

SIGNAL
7 led 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 or vice versa.
Burner repeats starting
cycle
Uneven fuel supply
Rusty pump internal
parts
Noisy pump, unstable
pressure
Pump unprimes after
prolonged pause
Pump leaks light oil
Smoke in flame
- dark Bacharach
- yellow Bacharach
Dirty combustion head
10 led blinks The burner goes to lock-
out
2916089
FAULT
34 - Poorly adjusted head . . . . . . . . . . . . . . . . . . . . . . . . . . .
35 - Poorly adjusted or dirty firing electrodes . . . . . . . . . . . .
36 - Poorly adjusted fan air gate: too much air . . . . . . . . . . .
37 - 1st nozzle is too big (pulsation) . . . . . . . . . . . . . . . . . . .
38 - 1st nozzle is too small (flame detachment) . . . . . . . . . .
39 - 1st nozzle dirty, or deformed . . . . . . . . . . . . . . . . . . . . .
40 - Inappropriate pump pressure . . . . . . . . . . . . . . . . . . . . .
41 - 1st stage nozzle unsuited to burner or boiler . . . . . . . . .
42 - Defective 1st stage nozzle . . . . . . . . . . . . . . . . . . . . . . .
43 - Control device TR does not close . . . . . . . . . . . . . . . . .
44 - Defective control box . . . . . . . . . . . . . . . . . . . . . . . . . . .
45 - 2nd stage sol. valve coil defective . . . . . . . . . . . . . . . . .
46 - Piston jammed in valve unit . . . . . . . . . . . . . . . . . . . . . .
47 - Low pump pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . .
48 - 2nd stage operation of cylinder is faulty . . . . . . . . . . . . .
49 - Nozzle dirty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50 - Photoresistor dirty . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51 - Excess air. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
52 - Check if cause is in pump or in the fuel supply system
53 - Water in tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
54 - Air has entered the suction line . . . . . . . . . . . . . . . . . . .
- Depression value too high (higher than 35 cm Hg):
55 - Tank/burner height difference too great . . . . . . . . . . . . .
56 - Piping diameter too small . . . . . . . . . . . . . . . . . . . . . . . .
57 - Suction filters clogged . . . . . . . . . . . . . . . . . . . . . . . . . .
58 - Suction valves closed. . . . . . . . . . . . . . . . . . . . . . . . . . .
59 - Paraffin solidified due to low temperature . . . . . . . . . . .
60 - Return pipe not immersed in fuel . . . . . . . . . . . . . . . . . .
61 - Air enters suction piping . . . . . . . . . . . . . . . . . . . . . . . . .
62 - Leakage from sealing organ. . . . . . . . . . . . . . . . . . . . . .
63 - Not enough air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
64 - Nozzle worn or dirty . . . . . . . . . . . . . . . . . . . . . . . . . . . .
65 - Nozzle filter clogged . . . . . . . . . . . . . . . . . . . . . . . . . . . .
66 - Erroneous pump pressure . . . . . . . . . . . . . . . . . . . . . . .
67 - Flame stability spiral dirty, loose, or deformed . . . . . . . .
68 - Boiler room air vents insufficient . . . . . . . . . . . . . . . . . .
69 - Too much air. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
70 - Nozzle or filter dirty . . . . . . . . . . . . . . . . . . . . . . . . . . . .
71 - Unsuitable nozzle delivery or angle . . . . . . . . . . . . . . . .
72 - Loose nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
73 - Impurities on flame stability spiral . . . . . . . . . . . . . . . . .
74 - Erroneous head adjustment or not enough air . . . . . . . .
75 - Blast tube length unsuited to boiler . . . . . . . . . . . . . . . .
76 - Connection or internal fault . . . . . . . . . . . . . . . . . . . . . .
77 - Presence of electromagnetic disturbance . . . . . . . . . . .
Maintenance
PROBABLE CAUSE
26 GB
SUGGESTED REMEDY
Adjust, see pag. 13, Fig. 14
Adjust, see pag. 13, Fig. 10 or clean
Adjust
Reduce 1st nozzle delivery
Increase 1st nozzle delivery
Replace
Adjust to between 10 - 14 bar
See Nozzle Table, pag. 11 ; reduce 1st stage
Replace
Adjust or replace
Replace
Replace
Replace entire unit
Increase
Change cylinder
Replace
Clean
Reduce
Feed the burner from a tank located nearby
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, see pag. 13 and pag. 19.
Replace
Clean or replace
Adjust to between 10 - 14 bar
Clean, tighten in place, or replace
Increase
Adjust head and fan gate, see pag. 13 and pag. 19.
Replace
See recommended nozzles, pag. 11
Tighten
Clean
Adjust, see pag. 19, open gate valve
Contact boiler manufacturer
Use the radio disturbance protection kit