Warranty Policy

What is covered?

Sunster's warranty covers manufacturing and material defects for a period of 1-year from date of purchase, subject to the following conditions and limitations:

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.

Warranty Period

The warranty will be activated automatically from the date of original purchase of this product. In the event of a product malfunction within the warranty period, Sunster's warranty team will assess the issue and determine the appropriate resolution, which may include one of the following options:

• Repair or replacement of the defective product under standard warranty coverage
• A refund or an alternative solution, as deemed appropriate by the warranty team

For any replacement approved under warranty, the warranty period will continue to be calculated from the original order's purchase date. For any upgrade approved under warranty (if you choose a different model and pay the price difference), the warranty period will be recalculated from the date of the replacement order.

What is NOT covered?

• Damage caused by the owner when attempting to fix or alter the product.
• Damage caused by misuse, abuse, neglect, alterations, or unauthorized repair.
• Battery discharge time shrinks due to aging over-use.
• Natural depreciation.

Note: If products and/or parts require service after the warranty period expires, you may choose to pay all labor and parts charges. Warranty coverage terminates if you sell or otherwise transfer the product. The limited warranty is restricted to the country of purchase and is not transferable outside of the country of purchase. Customers outside of the United States will cover the shipping fee for replacement items, parts and accessories as needed.

Labor & Service Costs

As a direct-to-consumer brand, we focus on providing strong parts coverage while keeping our product prices competitive.

• Replacement parts and standard shipping are provided free of charge within the warranty period.
• Installation, diagnosis, and repair work must be arranged separately with a qualified professional of your choice.
• Labor, service calls, disassembly, or reinstallation costs are not covered unless explicitly approved in writing by our official technical support team.

This approach gives you the flexibility to choose your preferred installer and avoids bundled labor markups.

How to request warranty services?

For warranty services, leave us a message online or email us at cs@sunster.tech. Our Customer Service Team will address your issue within 24 hours, usually sooner.

What will Sunster do?

Within the warranty, Sunster will offer replacements for the defective units, or send spare parts if necessary on our cost. Kindly note that if customers are seeking a refund, please contact the original purchasing channel. The official store will not offer any refund options in or outside the warranty.

Open Box Items

Open Box items are products which have damaged packaging or are otherwise not suitable to be sold as new. Open Box items are verified to work properly and include all essential parts and accessories (original or comparable substitutes).

Open Box items operate as intended, but show minor to moderate physical flaws, scratches, or scuffs that affect cosmetic appearance.

Open Box items come with a 6-month warranty and are not eligible for any warranty extension offered to new products. We will not accept returns of Open Box items due to cosmetic damage or other non-performance-related issues. All sales of Open Box items are final and not eligible for a return or refund.

If your Open Box item is defective or missing any parts or accessories, please contact cs@sunster.tech and we will be happy to arrange a replacement or send the missing parts.

Returning Products You're Unsatisfied With

If you are not completely satisfied with your purchase, you may return unused items within 30 days of delivery for a full refund, subject to the following conditions:

• Exclusion: Open Box items are not eligible for return or refund under this policy. All Open Box sales are final.
• Customers are responsible for return shipping costs for eligible (new) products.
• Please contact our customer service before shipping to obtain the correct return address and a Return Authorization. Unauthorized returns will not be accepted.
• Returns must be in the original Sunster packaging. Ensure all accessories, manuals, and components are securely placed inside.

Returning Used or Damaged Products

• If a new product is damaged or defective within 30 days of delivery, you are eligible for a replacement or refund, and we will provide a return shipping label.
• For Open Box Items: As stated in the Open Box policy, we do not accept returns for cosmetic damage, scratches, or scuffs. If an Open Box item is defective on arrival (non-functional), you are eligible for a replacement or a refund.
• Contact our support team as soon as you notice the issue. Provide photos or videos documenting the damage or defect. Securely pack the item in its original Sunster packaging.

Receiving the Wrong Item

• If you receive an item that is completely different from what you ordered, please contact us at cs@sunster.tech with a photo or video of the incorrect item.
• If a return is needed, we will ship a replacement and cover the return shipping cost upon receiving the returned item.

Late Returns – Restocking Fee

For return requests made after the 30-day return window, we may, at our discretion, accept the return. If approved, a 20% restocking fee will be applied and deducted from the refund.

Refund Timeline

Your return may take 1–2 weeks to arrive at our warehouse. Once received and inspected, refunds will be processed within 5–7 business days and credited to your original payment method. Depending on your bank, it may take an additional 2–10 business days for the refund to appear in your account.

Additional Notes

• Original shipping fees are non-refundable.
• Open Box items are not eligible for return or refund but are covered by a 6-month warranty.
• Products purchased from dealers must follow the dealer's return policy.

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

Warranty List

Category	Product	Warranty Period
Cooling	RV AC	1 Year + 1 Year Extension (after registration)
Outdoor Heating	Diesel Heater	1 Year + 1 Year Extension (after registration)
Other	Open Box Products	6 Months