How to Fix The Ignitor on an Oil Hot Water Heater

An oil hot water heater uses a burner unit for ignition. The system relies on oil nozzles to spray oil into a combustion chamber, where an electrical spark ignites it and creates a flame. If the ignitor or burner tube system is compromised, you could have an intermittent flame or no heat at all. Before you call a professional repairman, there are parts of the burner system you can inspect and repair to fix the ignitor on your oil hot water heater.

Wet rag
Flashlight
Small socket set

Instructions

- 1
  Open the burner unit housing door and clean any excess soot or dirt with a wet rag. The cad cell senses the flame and lets the controller know to keep the supply lines open. If it’s covered in dirt, the oil hot water heater could remain in the “off” mode and shut off the oil supply.
- 2
  Examine the electrical power supply to the burner unit. Look for obvious damage such as arcing along the electrical wires or disconnected leads. If the power cord is not plugged in or is damaged, it won’t deliver the electrical power needed to create heat.
- 3
  Inspect for oil puddling below the burner unit. An oil leak could signify damage to the burner unit or connection to the supply line. If the connection is tight or you see damage to the ceramic casing, replace the entire burner unit.
- 4
  Look at the blast tube for excessive soot or smoke, especially around the tip. Soot buildup can inhibit the flame’s ability to light the oil. Remove the burner unit according to your manufacturer's instructions, and clean the blast tube. This usually requires a small socket set to disconnect mounting bolts and electrodes.
- 5
  Check the burner’s air tube for proper installation clearance according to your manufacturer’s specifications. Incorrect clearance or obstruction of the air tube can restrict air flow needed for combustion.

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