Diedrich Ignition Troubleshooting

Problem: Diedrich roaster will not light or the flame goes out during the roast.

Extract originally From Diedrich’s old site:


Key locations for cleaning are:

Before even thinking about calling Diedrich – make sure absolutely everything is clean.
  • lower chaff compartment
  • Drum chaff tray
  • Airflow lever
  • Vacuum sensor (connects to Dungs)
  • Cooling bin screen
  • Blower impeller
  • Rear chaff collector duct
  • Chimney (from the down pipe of roaster to the top of the chimney)

Tools Needed

  • One small Flathead Screwdriver
  • One small Phillips Screwdriver
  • One Wire Brush
  • One Putty Knife
  • One small Pipe Cleaner or Paper Clip
  • Electrical meter


This is a classic symptom of an airflow issue. With this sheet you will be able to determine whether or not the symptoms are related to compromised air flow.

If your machine does not light, try making an air adjustment. With your machine turned on, move the air flow control from the cooling bin position to the 50/50 position. If the gas ignites you have proven there is an air flow or cleaning issue.

Also try remove the chimney from as close to the back of the roaster as possible. If this solves the problem the chimney is blocked somehow.

The burners going out during a roast and long roast times can also be signs of airflow problems.

With the burners lit, open one of your burner access doors. If this has either a positive or negative effect on the burners such as brighter burners (or dimmer) it is definitely airflow related.

From the roaster to the top of the chimney, all of these separate components combine into a balanced air flow system. Residue built up anywhere in the roasting system can affect the roaster’s function. This build up of residue will cause the airflow to be diminished, shutting the gas flow down to your burners. There can be a build-up of residue on impeller blades, air flapper, exhaust ports, etc.

Foreign objects in your chimney can also hinder the correct amount of air flow. Check for water dead birds, or other animals that may have got in there anything that impeeds airflow causes this problem.

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