Heat Pump Guide — error codes, servicing and costs (EN)
You run (or are buying) a heat pump and want to understand what the controller is saying, how to keep the system healthy, and how much heating should actually cost. This guide covers the practical long-tail questions: reading error codes and first responses, annual service scope and costs, seasonal electricity math for a 120 m² house, water quality, expansion vessels, defrost behavior in winter, and off-peak/dynamic tariff optimization.
Every article is dated and cites its sources; affiliate recommendations are flagged clearly. Brand mentions follow the models common across Central and Western Europe (Daikin, Vaillant, Samsung) — the logic applies to most air-source heat pumps.