Repair manual
TROUBLESHOOTING
5-4
HEATING SYSTEM
POSSIBLE CAUSE(S) SUGGESTED REMEDY
Symptom #1 - Burner will not fire (standard controls)
Oven in off mode.
No power to the oven.
Fuse blown on the control panel.
Determine if the controller setpoint is above actuĆ
al.
Intermittent Ignition Device (IID) system locked
out.
Air pressure switch may be open.
Blower motor(s) not running.
High limit in front panel open.
Hi limit on Hi/Lo limit board has been hit.
Verify that the pilot goes out when unit is shut
down.
Verify that combustion motor is spinning and that
the centrifugal switch is closed.
Temperature not programmed into cooking comĆ
puter.
Time not programmed into cooking computer.
Heat relay defective (computer controlled
ovens).
Gas pressure to oven too high.
Gas pressure to oven too low.
Turn the oven on.
Determine if the circuit breaker is tripped.
Replace the fuse.
If the setpoint is not above the actual, reset acĆ
cordingly.
Reference Technical Appendix (page 6-1
through 6-3).
Check convection blower for proper operation.
Verify voltage to motor. If voltage is present, reĆ
place the motor or start capacitor.
Verify that the temperature in the front panel is
lower than 140F (60C).
Verify that the oven temperature exceeded 600F
(316C).
If pilot does not extinguish, replace the pilot valve.
If the motor is not spinning, check the transformĆ
er and time delay relay in the control box on the
top of the combustion motor. If one or both are
bad, replace. If the motor is spinning and there
are not 24 volts to the ignition control box, the
centrifugal switch is bad. Replace the combusĆ
tion motor.
Program cook temperature into the computer.
Programm cook time into the computer.
Replace relay.
Lower to specified gas pressure.
Raise to specified gas pressure.