Troubleshooting
6-4
750-204
Profire D/LND
Problem Solution
Pilot Flame, But No Main Flame 1. Insufficient pilot flame.
2. Gas fired unit:
a. Manual gas cock closed.
b. Main gas valve inoperative.
c. Gas pressure regulator inoperative.
3. Limit circuit not completed, no voltage at end of limit circuit program relay
terminal.
a. Oil supply cut off by obstruction, closed valve, or loss of suction.
b. Supply pump inoperative.
c. No fuel.
d. Main oil valve inoperative.
e. Check oil nozzle, gun, and lines.
4. Flame detector defective, sight tube obstructed, or lens dirty.
5. Insufficient or no voltage at main fuel valve circuit terminal.
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.
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