Nieco 940 Gas, Owner'S Manual

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23
H. Troubleshooting Guide
PROBLEM PROBABLE CAUSES SOLUTION
Pilot Burners won't light.
Pilots won't stay lit when push button
is released.
Pilot flame weak or yellow.
Main Burners won't light, or they go
out during operation.
Burner appears dim (cooler).
Burners backfire or sputter.
Conveyor belts won't advance.
1. Pilot Burner dirty, or orifice plugged.
2. Push button valve not fully depressed.
3. Air in pilot line.
4. Electric spark ignitor dislocated.
5. Electric power not on, or machine not
plugged in.
6. Gas not hooked up or on.
1. Thermocouple not hot yet.
2. Weak pilot flame.
3. Thermocouple dirty or defective.
4. Push button power unit defective.
1. Dirty pilot or orifice.
2. Pilot tubing plugged or pinched off.
3. Incoming gas pressure too low.
1. Pilot flame too small.
2. Air draft blowing pilot flame out.
3. Electrical supply interruption.
1. Burner orifices dirty.
2. Gas pressure too low.
3. Gas line partially blocked.
4. Pressure regulator defective.
5. Burners not installed properly.
6. Burner venturi dirty.
7. Main gas valve partially closed.
8. Burner distributor screen dirty.
1. Gas pressure too high.
2. Burners have gotten wet.
3. Burner venturi dirty.
1. Machine not plugged in.
2. Wall circuit breaker off.
3. Motor control switch off.
4. Motor speed control not set properly.
5. Speed control pot. or SCR defective.
6. Drive chain broken.
7. Gear motor defective.
8. Loose or broken wire.
9. Motor unplugged.
10. Drive sprocket loose.
1. Clean pilot burner, replace orifice.
2. Repeat start-up procedure.
3. Purge line by holding down red push
button before igniting.
4. Position white electrode so the tip is
1/4" from the pilot burner, or light
manually.
5. Plug in/turn on.
6. Check Gas Supply
1. Repeat starting procedure, and hold
the push button in longer.
2. See Below.
3. Clean or replace.
4. Replace.
1. Clean or replace.
2. Check line. Pilot tubing can be
removed with a wrench.
3. Adjust pressure regulator.
1. Replace pilot orifice. See Above.
2. Check for drafts.
3. Secure power supply.
1. Clean or replace.
2. Adjust pressure regulator.
3. Check line and clear.
4. Replace.
5. Remove and install properly.
6. Clean. See Cleaning Instructions.
7. Open fully so that handle is in line
with the valve.
8. Clean.
1. Adjust pressure regulator.
2. Dry thoroughly, replace gasket.
3. Clean.
1. Plug in.
2. Turn on.
3. Turn on.
4. Reset cook time.
5. Replace.
6. Replace or repair.
7. Replace.
8. Tighten or replace.
9. Plug in.
10. Tighten sprocket set screw.