Chapter 7 - Troubleshooting
7-4 Part No. 750-184
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,
inadequate flame signal, or open control in the running interlock circuit.
SHUTDOWN OCCURS
DURING FIRING
7. Improper air/fuel ratio (lean fire).
A. Slipping linkage.
B. Damper stuck open.
C. Fluctuating fuel supply.
1). Temporary obstruction in fuel line.
2). Temporary drop in gas pressure.
3). Orifice gate valve accidentally opened (heavy oil).
8. Interlock device inoperative or defective.
MODULATING MOTOR
DOES NOT OPERATE
1. Manual-automatic switch in wrong position.
2. Linkage loose or jammed.
3. Motor does not drive to open or close during pre-purge or close on burner
shutdown.
A. Motor defective.
B. Loose electrical connection.
C. Damper motor transformer defective.
4. Motor does not operate on demand.
A. Manual/automatic switch in wrong position.
B. Modulating control improperly set or inoperative.
C. Motor defective.
D.Loose electrical connection.
E. Damper motor transformer defective.
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