Burner, Flame, And Ignition Troubleshooting; Cooktop Burners - Burner And Flame Diagnostics; Uneven Flame Distribution & Flame Noise Diagnostics - Thermador Pro Harmony PRL364GDH/01 Service Manual

Gas Leaks
Carefully check for gas leaks at each gas component that was
removed, replaced, or otherwise serviced using a gas leak detector or
bubble test.
Figure 10: Removing the Bezel Mounting Screw
Figure 11: Accessing and Setting the Bypass Screw
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Service Manual for the Thermador Pro Harmony Range, Model PRL364GDH/01

3.5 Burner, Flame, and Ignition Troubleshooting

3.5.1 Cooktop Burners – Burner and Flame Diagnostics
If a burner clicks (sparks) constantly, or if burner doesn't light correctly
and/or has inadequate burner/flame characteristics (per Burner
Characteristics page 11 and Flame Characteristics page 11), then do
the following:
 Check if the manual shut-off valve is open and the unit is receiving
gas (natural gas or liquid propane).
 Check if the burner cap is properly aligned on the burner base.
 Check if the burner port is open and not clogged or blocked.
 Check if the igniter electrode is free from debris and is sparking.
 If it is suspect that air is in the gas supply lines and system, you
can purge the remaining air by operating one of the burners for
several minutes.
 Check if a fuse has blown or a circuit breaker has tripped.
 For constant sparking, check wiring connections at ignition device
and electrode, and also check grounding
 Refer to the Ignition Diagnostics, page 14.
 Call Thermador technical support at (800) 444-9091 for assistance
if any burners fail to light, or any burners continue to burn yellow.
3.5.1.1 Uneven Flame Distribution & Flame Noise Diagnostics
If there is an uneven flame distribution around the burner ports and/or
a loud noise emanating from the flame, it could be caused by bad
combustion due to a misalignment of the gas jet assembly and Venturi
tube. For optimal combustion, the jet needs to be centered inside of
the Venturi tube. A misalignment of these two components can be
caused by either the pedestal burner base and/or jet assembly not
positioned correctly onto the maintop – resulting in a poor mixture of
gas and air. Perform the following diagnostic steps:
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