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Principle of heating tube
The following 3 cases of heating tubes are normal
The upper tube works - only the upper tube turns red
The lower tube works - only the lower tube turns red
Both upper and lower tubes work - Both upper and lower
tubes turn red
1. The oven uses intermittent heating to control the temperature of the
cavity. It is normal that the heating tubes turn red and dark during the
working process.
2. The metal heating tubes will show obvious dark red only when the
surface temperature reaches 600°C or higher. If it can work normally,
it is normal that the heating tube does not turn red and it does not
affect normal use.
3. Due to the process characteristics, the U-shaped heating tubes
usually turn red slightly or are not red in working condition, but it is
still in normal working condition.
Upper heating tube
Lower heating
tube
Upper heating tube
temperature control knob
Lower heating tube
temperature control knob
12
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