*PLUMBERSSTOCK EXPERT* responded:
Hi! Thank you for visiting PlumbersStock.com. Here in PlumbersStock, it is our satisfaction to help you with your concerns. With regards to your question, when the green and red LEDs are alternately flashing, it indicates that the heat pump is in anti-short cycle lockout mode. For reference, please check page 8 of this manual. If you have other inquiries, please contact one of our customer support specialists at 435-868-4020 or through e-mail @ firstname.lastname@example.org. If you want to have access to our exclusive discounts and limited offers, you can sign up for our newsletter by entering your email address in the area provided on the bottom part of this page. Happy shopping!