Service Manual for the Thermador Pro Grand Next Generation 48-Inch Natural Gas and LP Gas Ranges, Models:
PRG486JDG/01, PRL486JDG/01
58300000159722_ARA_EN_D
Page 16 of 92
3.6.2
Adjusting the Bypass Screws
m
Caution
Potentiometer Failure
Failure to turn off electrical power when adjusting bypass screws may
cause failure of the potentiometers
1. Turn off electrical power by unplugging the power cord, or putting
the circuit breaker in the
OFF
position.
2. Remove knobs from valve stems by slowly pulling knobs straight
out, away from control panel.
3. Remove and retain the right bezel mounting screw.
4. To engage the valve screw, insert the precision screwdriver with a
1/8 inch blade into the same hole in the bezel that was created by
the removal of the
right side
mounting screw.
5. Turn the valve screw clockwise just until "bottom out" position is
reached. Don’t over-tighten the valve screw.
NOTE:
The XLO valves must be in the
XLO
position for proper
access to the valve screws through clearance hole in the
potentiometer.
NOTE:
The griddle/grill is electric, controlled by a thermostat and
does not have a valve that requires adjustment.
Gas Leaks
With electrical power off, carefully check for gas leaks at each gas
component that was removed, replaced, or otherwise serviced using a
gas leak detector (electronic leak detectors are highly recommended)
or bubble test. For non- standard (XLO) valves, the electrical power
may need to be on when testing.
Use extreme caution
when
performing gas leak testing on XLO valves.
3.7 Troubleshooting Burners, Flame, and Ignition
3.7.1
Burner and Flame Diagnostics for Rangetop Burners
If a rangetop burner clicks (sparks) constantly or if burner doesn’t light
correctly and/or has inadequate burner/flame characteristics (per
Rangetop Burner Characteristics,
page
, page
), then do the following:
ü
Check if manual shut-off valve is open and unit is receiving gas.
ü
Check if the burner cap is properly aligned on the burner base.
ü
Check if the burner port is open and not clogged or blocked.
ü
Check if the igniter electrode is free from debris and is sparking.
ü
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.
ü
Check if a fuse has blown or a circuit breaker has tripped.
ü
Check polarity
ü
For constant sparking, check wiring connections at ignition (spark)
module and electrode, and also check grounding.
ü
For intermittent sparking, check the pot spacing, flame height, and
drafts in kitchen.
ü
Ignition Diagnostics for Rangetop Burners,
page
ü
Call Thermador technical support at (800) 444-9091 for assistance
if any burners fail to light, or any burners continue to burn yellow.
3.7.2
Ignition Diagnostics for Rangetop Burners
The following flowchart applies in the event a burner fails to ignite.
Before performing steps in the
Diagnostic Flowchart for Rangetop
(Figure 9, page 17), remove electrical power from
appliance during disassembly and during removal and installation
procedures. Restore electrical power when testing the unit if it is
reassembled.