Inspect door gasket to make certain it fits firmly against cabinet at all
points. Replace gasket if torn or damaged.
Improper door closure - Inspect door latches which are spring loaded to
see if they pull the door in tightly against the body of the oven. If the
"finger" of the latch (in the door) has been sprung into the body of the
latch, use a pen or similar object to pop it back out. Check the oven
cabinet to see that it is level. Use a spirit level and turn the 4 adjustable
feet on the bottom of the oven to make it level.
No Heat - If the chamber does not heat, first check the line voltage, circuit
breakers and/or fuses of the line circuit. Check if all electrical connections
are secure.
Warning
Disconnect oven from its power source before proceeding. Refer
to the appropriate wiring diagram at the end of the manual and locate the
electrical leads for the heater. Use the values in the Heater Cold Resistance
Table to find the appropriate value. Be sure to disconnect at least one
heater lead from the terminal strip before taking the reading with the ohm
meter. Again, it is imperative that the unit be completely disconnected
from its electrical power source before any readings are taken.
V
If the heater is open (infinite resistance) it should be replaced. If the heater
reads less than five ohms it is shorted and should be replaced. Check the
resistance between each lead of heater and a bare metal point on the oven
chassis. If there is less than infinite resistance (a million ohms or greater)
between the heater and chassis, the heater is shorted to ground and should
be replaced. Also, inspect all wires leading to the heater for signs of
shorting or electrical contact to chassis of oven.
3177885 Thelco Oven 8-3
Thermo Electron Corporation
Section 8
Section title
Heat Loss
Heater Resistance
Check
