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NORA Oilheat Technicians Manual

combustion process. It could be an ignition problem, an oil problem or excess air. • If nothing happens, the control might be sensing flame. The cad cell leads might be crimped together or the F-F terminals might be shorted. • If the burner hums but does not start, the burner motor might be defective or the pump might be “bound” causing the motor to shut off on overload. Step 4. The 5 Whys: Professional Service Technicians look beyond the symptoms to find the cause of the problem. For example, if you press the reset button and the burner starts, you have not fixed anything. You have to find out why the control went off on safety and take corrective action to keep it from happening again. When you find the cause of a problem, ask yourself “why did this happen?” Continue to ask yourself the same question and eventually you will get to the real cause of the problem. For example, suppose a customer has no heat. During 15-6 Service Procedures your systematic troubleshooting routine, you may find the following: Sometimes you will find the answer with less than five “whys”; sometimes it might take more than five. The key is to keep asking until you are satisfied that you know the reason for the problem and the corrective action to take. Step 5. The “Hows”: Once you know the “whys” you need to correct the immediate problem and keep it from happening again. “How” do you do that? In the situation we just reviewed in the “5 Whys” the following steps are required: 1. Replace the vent pipe 2. Remove the water from the tank 3. Clean the oil lines 4. Replace the fuel unit 5. Replace the nozzle 6. Replace the oil filter 7. Reset the primary control (and burner motor if applicable) 8. Fire the unit 9. Adjust the burner and perform an efficiency test In some situations, you might not have the time, equipment or experience necessary to perform all of the “Hows”. In that case, you should troubleshoot the situation to the best of your ability and contact your supervisor for instructions on how to proceed. Step 6—Paperwork and exit. Once you have completed the “Hows,” clean up your work area, remove all debris to a receptacle in your service vehicle and clean your hands. Complete your company’s paperwork and fill in the service card at the unit. Take Chapter 15 Service Procedures


NORA Oilheat Technicians Manual
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