Heating unit
The heater had some technical issues, so I went to the local repair shop to check it. The thermostat had faulty wiring; the wiring was replaced.
I bought this heater a few years back, and when I went to the repair shop, they told me all the other parts are functioning fine and just simple wiring work will be enough.
It saves money and extends the life of the product. We shouldn't just buy a new product.