Source
Power
Source
Poor Fire
Flame Detector
Oil Supply
Procedure
If voltage fluctuates, fault is in the power source. Recheck voltage at the power source.
Procedure
After burner fires,
immediately jumper across flame detector
terminals at the primary control.
•If burner continues to run (does not lock out of safety), fault may be poor fire. Inspect fire.
•If fire is good, check for fault in flame detector
circuit.
•If burner loses flame (does not lock out on safety), fault is in the fuel system.
Listen for pump whine
Causes
Loose wiring connection
Low or fluctuating line voltage
Causes
Unbalanced fire
Too much air - - lean short fire
Too little air - - long dirty fire
Excessive draft
Too little draft or restriction
Dirty CAD cell face
Faulty CAD cell - - exceeds 15000 hms
Loose or defective cad cell wires
Pump loses prime - air slug
Pump loses prime - air leak in supply line
Water slug in line
Partially plugged nozzle or nozzle strainer
Restriction in oil line
Plugged fuel pump strainer
Cold oil - outdoor tank
Correction
Locate and secure connection.
Call power company.
Correction
Replace nozzle
Reduce combustion air - check combustion.
Increase combustion air - check combustion.
Adjust barometric damper for correct draft.
Correct draft or remove restriction.
Clean CAD cell face.
Replace CAD cell.
Secure connections or replace cad cell holder and wire leads.
Prime pump at bleed port
Check supply line for loose connections and tighten fittings.
Check oil tank for water (over 1 inch) pump or drain out water.
Replace nozzle.
Clear restriction.
Clean strainer or replace pump.
Change to number 1 oil.
Page 22
505082M 10_5
