Riello ER Series Installation, Use And Maintenance Instructions page 49

6.5 Problems and solutions
When a burner failure occurs, first of all:
1 check that the wiring has been done correctly;
2 make sure that the fuel is flowing;
3 check that all the adjustment parameters (e.g. temperature boiler water or boiler steam pressure) have been set properly.
OIL OPERATION
Problem
The burner does not start
The burner turns on and then
stops in lockout mode
The burner turns on and then
stops in lockout mode
The burner remains in the pre-
purge phase
Once the pre-purging and the
safety time has elapsed the
burner goes into lockout without
the flame appearing
The flame ignites regularly but
the burner goes into lock out at
the end of the safety time
Smoky flame (dark flame)
Smoky flame (light flame)
Firing with pulses
Burner stops in lockout during
operation
Possible cause
• The burner's pilot is not functioning . . . . . . . . . . . . Check
• Fan motor lockout . . . . . . . . . . . . . . . . . . . . . . . . . . Reset the thermal relay
• Electrical control box is defective . . . . . . . . . . . . . . Replace it
• Safety solenoid defective . . . . . . . . . . . . . . . . . . . . Replace it
• Oil modulator defective . . . . . . . . . . . . . . . . . . . . . . Overhaul it or replace it
• Air pressure switch is badly adjusted . . . . . . . . . . . Adjust it
• Pressure socket tube of the pressure switch clogged Clean it
• Malfunction in the flame detection circuit . . . . . . . . Replace the electric control box
• Contacts 3 or 5 of the servomotor do not cut in . . . . Regulate cam 3 or 5 of the servomo-
tor
• Solenoid valves do not open . . . . . . . . . . . . . . . . . Check the wiring and check the
• Nozzle obstructed, dirty or bent out of shape . . . . . Clean it or replace it
• The burner's pilot is not functioning . . . . . . . . . . . . Check
• Electrical control box is defective . . . . . . . . . . . . . . Replace it
• Photocell defective or dirty . . . . . . . . . . . . . . . . . . . Replace it or clean it
• Little air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust the head and the air damper
• Nozzle dirty or worn . . . . . . . . . . . . . . . . . . . . . . . . Replace it
• Pump pressure wrong . . . . . . . . . . . . . . . . . . . . . . Adjust it
• Flame disc dirty, loose or bent out of shape . . . . . . Clean it, tighten it up or replace it
• Too much air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust the head and the air damper
• Head badly adjusted . . . . . . . . . . . . . . . . . . . . . . . . Adjust it properly
• Air damper badly adjusted . . . . . . . . . . . . . . . . . . . Adjust it
• Nozzle defective . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace it
• Photocell defective or dirty . . . . . . . . . . . . . . . . . . . Replace it or clean it
• Air pressure switch defective . . . . . . . . . . . . . . . . . Replace it
6
CHAPTER
Recommended remedy
solenoids
Maintenance
23