True 831971 - M-182-013-66332 - Defrost Timer by Invensys

Front view of the True 831971 (Invensys M-182-013-66332) defrost timer showing specs.
View of the electrical prongs on the True 831971 defrost timer by Invensys (M-182-013-66332)
Side view of the True 831971 defrost timer by Invensys (M-182-013-66332)
Important! - Please provide the serial number (i.e. 1-2345678) and model number (i.e. GDM-5, T-49, etc) for your unit in the comment section at time of checkout if you want us to confirm the part's compatibility with your unit. Both of these numbers are found on a tag generally located on the left interior wall of the cabinet. This video will help explain where to find this information.
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Free Compatibility Check:

We offer a no cost compatibility check for parts purchased for True, Ice-O-Matic, and Vitamix equipment. If you are purchasing a part for one of the listed brands and fill out the compatibility check we will use the information you provide to verify that the part is correct after you check out. This free service typically adds a 1 day lead time to your order but ensures that you get the correct part.
If you leave these fields blank, you waive this service & accept responsibility for your part choice. All sales are final if we do not ensure compatibility.
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Manufacturer #


The True 831971 defrost timer by Invensys (M-182-013-66332) is designed to regulate the defrost cycle that prevents frost buildup on the evaporator coils. Frost can act like an insulator around the evaporator coils and prevent them from absorbing the heat in the cabinet. It is vital to the life of your unit, your refrigeration components, and the products stored inside of your unit that you replace the defrost timer when it fails to work properly. The True 831971 defrost timer manufactured by Invensys (M-182-013-66332) replaces the True 831921 on 208V models and the True 831912 on 115V models. Feel free to call our customer service specialists to make sure that this is the right defrost timer for your unit.

  • True Part Number: 831971
  • Manufacturer: Invensys
  • Manufacturer Model Number: M-182-013-66332
  • Voltage: 120V
  • Hurtz: 60Hz
  • Amperage: 15A