I can help you create a refund, Nina71.

You can create a bank deposit to track the refund. It won't require you to enter a vendor name. You'll just have to select the correct expense account where the amount will be deposited.

I'll show you how:

1. Click on the + New button and click Bank Deposit.
2. From the Account box, select the expense account used upon purchasing the equipment.
3. On the Add funds to this deposit section, choose the Account where the money is coming from.
4. Enter the Amount.
5. Click on Save and close.

Feel free to check these references for more details on how to process a refund: 

• How do I handle supplier credits and refunds?
• Record a customer refund in QuickBooks Online

You can always mention me in your reply if you have other questions in mind. Take care and have a great day!