Service Manual for the Thermador Pro Harmony Range, Model PRL364GDH/01
58300000154022_ARA_EN_D
Page 13 of 68
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
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
page
and
), 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
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: