Warranty Policy

What is covered?

Sunster's warranty covers manufacturing and material defects for the applicable warranty period from the date of original purchase, subject to the following conditions and limitations. Warranty periods vary by product category — see Warranty Period by Product below.

  1. This unit must be installed and operated at all times in accordance with the instructions furnished with the product. Any alteration, willful abuse, accident, or misuse of the product shall nullify this warranty.
  2. This warranty is non-transferable and is made to the original owner, provided that the purchase was made through an authorized supplier of the manufacturer. This warranty is limited to the repair or replacement of part(s) found to be defective in material or workmanship, provided that such part(s) have been subjected to normal conditions of use and service, and after said defect is confirmed by the manufacturer's inspection.
  3. Proof of purchase (order number, sales invoice, or order confirmation email showing product description, price, and sales channel) is required for any warranty claim.

Warranty Period by Product

Your Sunster product is covered for the following durations from the date of original purchase:

  • RV AC (Cooling): 1-Year warranty.
  • Diesel Heater (Heating): 1-Year warranty.
  • Heater/AC Parts (Other): 6 Months warranty.

What is NOT covered?

  • Damage caused by misuse, abuse, neglect, alterations, or unauthorized repair.
  • Unauthorized modification, disassembly, or operation not in accordance with official instructions or manuals.
  • Purchased from unauthorized resellers.
  • Use for special applications other than normal consumer use.
  • Lost, stolen, or fully refunded products.
  • Any defect or damage caused by exposure to excessive heat, cold, liquids, or other external causes.
  • Invalid, altered, or missing proof of purchase.
  • Damage caused by force majeure (lightning strikes, tornadoes, hurricanes, floods, earthquakes, etc.).
  • Warranty period expired.
  • Natural wear and tear through normal usage over time.
  • The model on the warranty claim does not match the actual item.

How to Request Warranty Service

If your Sunster product malfunctions, you may choose either of the following two routes. Both receive the same warranty service — please select the one that works best for you.

Route 1: Contact Sunster Customer Service

  • Email us at cs@sunster.tech or leave us an online message.
  • Provide your order number and a description of the issue (photos or short videos are highly recommended to help illustrate the problem).
  • Our team will assess the cause and advise next steps: remote guidance, replacement parts shipment, or refund.
  • We will respond within 24 hours, usually sooner.

Route 2: Visit a Sunster Authorized Service Partner

(Recommended if on-site diagnosis, disassembly, or equipment testing is required.)

  • Locate your nearest partner by country/region on our Authorized Service Partner page.
  • Before visiting, please schedule an appointment and inform the partner that you wish to file a Sunster warranty claim.
  • The partner will inspect the product and report findings to Sunster. Defects covered under this warranty will be handled according to this policy.

Regardless of which route you choose, within the warranty period Sunster will replace defective units free of charge, or ship spare parts at our cost when necessary. Please note: if you require a refund, please contact the original purchasing channel.

Return & Refund

Order Cancellation: Customers may request cancellation within 24 hours of placing an order by emailing the Sunster official store. If the product has already shipped, an intercept fee will apply and cancellation may no longer be possible.

30-Day Money-Back Guarantee: A 30-day refund guarantee is automatically credited to your order. For more details, please click here.

Disclaimer of Implied Warranties & Limitation of Liability

This limited warranty is in lieu of all other expressed or implied warranties, including any warranty of fitness for a particular purpose or use and any implied warranty of merchantability. Sunster and its affiliated companies shall not be liable for any special, incidental, or consequential damages, including lost profits. There are no warranties extended other than as provided herein.

This limited warranty may be modified only by Sunster. Any implied warranties allowed by law shall be limited in duration to the terms of the express warranty provided herein. Some states/countries do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may also have other rights that vary from state to state or country to country. Sunster's only liability shall be the repair or replacement as stated above.

If you have any questions, please contact our support team at cs@sunster.tech. We're here to help!