
FLOOR MODEL GAS DECK OVEN SERVICE MANUAL
16
TROUBLESHOOTING
Temperature Calibration
Thermostats are calibrated at the manufacturer and field
adjustments are seldom necessary. They should not be
made unless actual cooking experience indicates the
control is not maintaining set temperature. Breaking the
seal on the calibration plate locking screws may void the
manufacturer’s warranty for the thermostat.
Use a digital thermometer.
Place a thermocouple along the capillary bulb in the
oven cavity. Close the door.
Light the main burner. Adjust temperature setting to
400ºF. Allow oven to heat until burner flame drops to
by-pass.
Check temperature reading at thermometer. If not within
25º of set point adjust dial setting.
To adjust:
Pull knob straight off. Do NOT turn stem while removing
knob. Grasp calibration plate and hold in place while
loosening two calibration lock screws. Use a #1 Phillips
screwdriver.
The calibration plate has markings and the
name “ROBERT SHAW” stamped in it. There are
approximately 50º between each letter.
Turn calibration plate counter-clockwise to lower set
point. Turn calibration plate clockwise to increase set
point.
Tighten locking screws and replace dial.
Test Thermopile And Valve
Use these test procedures to trouble shoot the
thermopile and combination gas valve. Prior to perform-
ing any tests clean and tighten all wire connections at
the combination valve.
Clean the pilot orifice and insure the Thermopile is not
coated with soot from a high pilot flame.
Use a digital volt meter with a scale capable of reading
millivolts.
System Test
- pilot lights, main burner does not.
Connect volt meter leads between terminal 2 and
terminal 3. Turn gas cock dial to “ON”. If meter reading
is greater than 100 mV replace valve. If meter reading
is less than 100 mV run additional tests.
Thermopile Output Test
- pilot won’t stay lit or main
burner won’t light.
Connect volt meter leads between terminal 1 and
terminal 2. Remove jumper from terminal 3. Gas cock
dial in “PILOT” position. If meter reading is less than
325 mV replace Thermopile.