Need to change the heater filament. The heater filament has several portions to produce heat. As it ages, some portions are not producing heat anymore hence the total heat produced by an old filament can not put out as much as originally designed.
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Need to change the heater filament. The heater filament has several portions to produce heat. As it ages, some portions are not producing heat anymore hence the total heat produced by an old filament can not put out as much as originally designed.