There was just one problem: The original manual is lost to time. And the PDF I found online? It was for the 600 K , but clearly —annotated, corrected, and marked up by a previous owner who had clearly fought (and barely won) a war with this machine.
Before striking a match, one must understand the engineering. The 600 K is not a modern, airtight, EPA-certified wonder of complex airflow dynamics. It is a robust, radiant heater. rosenlew kotiliesi 600 k kayttoohje patched
Another angle: the user might not be a native Finnish speaker, given the mix of Finnish in the query. Maybe they mistyped "kotiliesi" – perhaps it's a different product? But Kotiliesi translates to "homestead" or "homeplace", which fits with a home heating appliance. There was just one problem: The original manual