PROBLEM SOLUTION
Burner Stays in Low-Fire 1. Pressure or temperature above modulating control setting.
2. Manual-automatic switch in wrong
position.
3. Inoperative modulating motor.
4. Defective modulating control.
5. Binding or loose linkages, cams, setscrews, etc.
PROBLEM SOLUTION
Shutdown Occurs During Firing 1. Loss or stoppage of fuel supply.
2. Defective fuel valve, loose electrical connection.
3. Flame detector weak or defective.
4. Scanner lens dirty or sight tube obstructed.
5. If the programmer lockout switch has not tripped, check the limit circuit for an
opened safety control.
6. If the programmer lockout switch has tripped:
a. Check fuel lines and valves.
b. Check flame detector.
c. Check for open circuit in running interlock
circuit.
d. The flame failure light is energized by ignition failure, main flame failure, inad-
equate flame signal, or open control in the running interlock circuit.
7. Improper air/fuel ratio.
a. Slipping linkage.
b. Damper stuck open.
c. Fluctuating fuel supply.
•Temporary obstruction in the fuel line.
•Temporary drop in gas pressure.
8. Interlock device inoperative or defective.
9. air in the oil lines. Bleed lines.
Chapter 2 Profire V Burner
2-52 750-177
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