Hie to those who have five star products that are burnt or with error codes take the invertor to five star shop at China Multiplex Johannesburg, thy are the importers thy have all parts and spares it's not a bad product I have been installing and preparing the products for over 8 years now, it's so cheap I will help you there ask for Arthur tell him Desire refered you I will fix the issues for u error 4 issues it's issualy burnt musffets it's R650 to replace them and labour of R300. It's caused by over load or load surge during startup it's mainly caused by elements on load during start ups or coils of motors on start ups.0x7x3x9x7x0x2x5x5x0 in Johannesburg that's my direct number. Plz install surge protector, time delay unit between eskom supply and invertors preventing is better than cure. Call for advise even if ure not in Johannesburg.