Riello DB 3 LSM C13 Installation, Use And Maintenance Instructions page 56

7.3 Problems and remedies
If the burner does not work properly, first you must:
1 check that the electric connections have been correctly performed;
2 make sure that the fuel is flowing;
3 check that all the adjustment parameters (e.g. boiler water temperature or boiler steam pressure) are correctly set.
OIL WORKING
Fault
The burner does not start
The burner does not start and a
function lock out occurs
The burner starts but stops at
maximum air damper setting
The burner ignites but then
blocks
The burner starts and then locks
out
The burner stays in the pre-
purge stage
Possible cause
• No electrical power supply . . . . . . . . . . . . . . . . . . . .Close all switches - Check connec-
• A limiter or safety control device is open. . . . . . . . . .Adjust or replace
• Control box lock-out . . . . . . . . . . . . . . . . . . . . . . . . .Reset control box
• Control box fuses blown . . . . . . . . . . . . . . . . . . . . . .Replace
• Erroneous electrical connections . . . . . . . . . . . . . . .Check connections
• Defective control box . . . . . . . . . . . . . . . . . . . . . . . .Replace
• Air pressure switch in operating position . . . . . . . . .Adjust or replace
• Contact 2 of the servomotor, terminals 11-8 . . . . . . .Adjust cam 2 or replace the
of the control box do not operate (SQM 10) . . . . . . .servomotor (SQM 10)
• Contact 2 of the servomotor, terminals 11-8 . . . . . . .Adjust cam 2 or replace the
of the control box do not operate (SQM 40) . . . . . . .servomotor (SQM 40)
• Flame simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace control box
• Contacts 1 or 4 of the servomotor, or terminals 9-8 .Adjust cams 1 or 4 or replace the
of the control box do not operate (SQM 10) . . . . . . .servomotor (SQM 10)
• Contacts 4 or 6 of the servomotor, or terminals 9-8 .Adjust cams 4 or 6 or replace the
of the control box do not operate (SQM 40) . . . . . . .servomotor (SQM 40)
Air pressure switch inoperative due to insufficient air pressure:
• Air pressure switch adjusted badly . . . . . . . . . . . . . .Adjust or replace
• Pressure switch pressure point pipe blocked . . . . . .Clean
is blocked
• Head wrong adjusted . . . . . . . . . . . . . . . . . . . . . . . .Adjust
• Fault in flame detection circuit . . . . . . . . . . . . . . . . .Replace control box
• Contacts 3 or 5 of the servomotor, or terminals . . . .Adjust cams 3 or 5 or replace
10-8, of the control box do not operate . . . . . . . . . . .the servomotor (SQM 10)
• Contacts 3 or 5 of the servomotor, or terminals . . . .Adjust cams 3 or 5 or replace
10-8, of the control box do not operate . . . . . . . . . . .the servomotor (SQM 40)
7
Maintenance
CHAPTER
Recommended remedy
tions
25