Hi @kaseopaya
Bit confused by your terminology, do you mean that the defrost heater is always going faulty or that the defrost thermostat which is part of the heater is faulty.
If the compressor not operating when the temp light is blinking it sounds more like a problem with the defrost timer than the heater
Here's the wiring diagram for the freezer that may help.
As can be seen by the notes, the defrost timer, (shown as timer in the wiring diagram) disconnects the compressor circuit after every 12 hours compressor run time and switches over to supply power for 30 minutes to the evaporator defrost circuit comprising the evaporator defrost heater and the defrost thermostat.
If the temperature detected by the defrost thermostat goes >50°F before the 30 minutes has elapsed, it opens to cut off power to the heater so as to not damage the evaporator unit. Once the 30 minute defrost time has elapsed, the timer switches the circuit back to turn on the compressor to drive the temperature back down to the set operating temperature as selected by the temperature thermostat (shown as the cold control in the wiring diagram).
If the temperature detected by the defrost thermostat stays <50°F, once the 30 minute defrost time has elapsed, the timer cuts off the heater circuit and switches the circuit back to turn on the compressor circuit, to drive the temperature back down to the set operating temperature as selected by the temperature thermostat (shown as the cold control in the wiring diagram).
When the temperature reaches <10°F the defrost thermostat closes which prepares the defrost heater circuit for the next defrost cycle.
The compressor operating/not operating during the period between the defrost cycles is controlled by the temperature thermostat i.e. when the freezer's set temp of 2°F is reached, the temperature thermostat opens to turn off the compressor as you don't want it to get any colder. When the freezer temperature rises above the set upper limit of the temperature thermostat of 8°F it closes to turn on the compressor to drive the temperature back down to the set operating temperature. The compressor cycles on and off keeping the temperature between 2°F - 8°F as controlled by the temperature thermostat, until the next defrost cycle when it is turned off for 30 minutes, by the defrost timer.
Apologies for the long answer but I thought that if you understood how it's supposed to operate, you can work out why it isn't.
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