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 18 of 92
4 DIAGNOSING HOT SURFACE IGNITERS, GRIDDLE /
GRILL ELEMENT, OVEN LIGHTS, TEMP SENSORS
4.1 HSI and Element Diagnostics
4.1.1
Cycle/Circuit Specification
Cavity
Mode
HSI/Element
Watts
Volts
Amps
Ohms
small,
large
Bake
Bake burner HSI
420
120
3.5
34
small,
large
Broil
Broil burner HSI
420
120
3.5
34
small,
large
Convection Bake
Bake burner HSI
420
120
3.5
34
N/A
Griddle / Grill
NOTE:
For
specific models
Griddle / grill
element
1600
120
13.3
9.0
4.1.2
Safety Practices for HSI and Element Diagnostics
Observe all pertinent safety practices such as warnings, cautions and
instructions contained in the
Safety Precautions to Know Prior to
throughout this manual, and
the Installation Manual. Ensure compliance with all applicable codes.
4.1.3
HSI and Element Diagnostic Tips
General
ü
The electrical wiring diagram is located behind the kick panel of
the range (see
page
ü
Bake and broil modes cannot be operated simultaneously in any
single oven cavity.
Resistance Reading
ü
You can perform a resistance reading on an HSI or the griddle/grill
element with the electrical power to the range turned off.
Amperage Reading:
ü
Broil mode:
Broil burner remains on until reaching the maximum
temperature, and cycles off and on to maintain that temperature.
ü
Bake mode:
The power to the bake burner cycles on and off at
pre-set intervals when the bake burner is preheating (preheating
indicator light is on) and also during regular bake cycle (after
preheating).
ü
Electric griddle/grill element and HSIs:
•
Check either HSI/element wire with an amp meter and amp
clamp.
NOTE:
Always check an HSI at one of its wire connectors
NOTE:
Although the HSI may be glowing, if not enough
current is running through it, the safety valve may not open.
, as
the gas burner (attached to the other end of HSI) will ignite.
•
Alternatively, you can check the electric griddle/grill element or
HSIs at the wires going to the hot or neutral terminals of the
terminal block.
•
Alternatively, you can check the electric griddle/grill element or
HSIs from the corresponding I/O relay terminals on the main
control board.
Temperature Reading
Do not remove the thermocouple prematurely when the oven is hot.
ü
Use a thermometer with a thermocouple leads to test the oven
temperature. If you leave the thermocouple in the oven during a
speed clean cycle, keep in mind it will take a few hours before the
oven is cool enough if you plan to retrieve the thermocouple.
Convection Bake
ü
For convection bake, you can visually inspect if the convection fan
is working. The convection fan only works after the preheating
finishes, thus it may take less time to test the convection fan on
the lowest bake convection setting.
4.2 Oven Light Diagnostics
To diagnose problems with the oven light (for all ovens), see
(Figure 10, page 19). Also see
Transformer Removal and Replacement,
page