The defrost thermostat monitors the temperature of the evaporator coils. When the coils drop below a set temperature, the thermostat contacts close to allow power to flow to the defrost heater during the defrost cycle. In the defrost cycle, the defrost heater melts away any frost that may have accumulated on the evaporator coils. If the defrost thermostat is defective, the thermostat contacts will not close. As a result, the thermostat won’t provide power to the defrost heater. To determine if the defrost thermostat is defective, use a multimeter to test it for continuity. If the defrost thermostat does not have continuity when it reaches the low temperature of its operating range, replace it.
ltem NO | ELTH-001 03434 |
Use | Defrost/Temperature control/Protection |
Appliance | Refrigerators, Freezer |
Reset type | Automatic |
Basic material | Bakelite, Epoxy Resin, PA |
Electric rating | 250V 10A |
Action temperature range | -30°C~90°C |
Differential | According to the requirement |
Insulation resistance | ≥100MΩ |
Tolerance | Refer to the regulation |
Life cycle | 100,000 times |
Contact material | Silver |
Dielectric Strength | Parts between electriferous components and non-electriferous ones can bear 2000V (3750V for Reinforced insulation type) 50Hz AC current, which is nearly sine wave, for one minute as bearing test. Resulted no breakdown, no flashover. |
Insulation Resistance | With a DC 500V megger, borne DC 500V, the tested value is over 10MW. |
Resistance Between Terminals | Below 50mW |
Temperature characteristics | Normal close, Normal open |
Maximum Ambient Temperature | 90°C |
Diameter of Bimetal Disc | F12.7mm(1/2″) |
Wire Leads | Color: Red Length: customized |
Terminal type | Customized (Refer to our specification) |
Cover/Bracket | Customized (Refer to our specification) |
Sample Price | Free sample USD 50 freight charge, refund after mass order |
What happens when defrost thermostat fails?
If the thermostat is defective it may not be able to sense the temperature of coils and then won't turn on the defrost heater. If the defrost heater doesn't turn on, the refrigerator will never start the defrost cycle and will eventually stop cooling.
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