Thermostat — counterfeit risk and testing

Tags: #thermostat · #cooling · #counterfeit · #aliexpress

A buyer purchased a thermostat from a Chinese parts site (Китзапчасти, Nizhny Novgorod branch) and found the unit had no stamped temperature activation number on the shell — OEM units are normally expected to show this marking visibly on the housing ¹². The buyer considered returning it as a likely counterfeit ³⁴.

Community-suggested verification: pull the thermostat out of its housing and drop it in boiling water — a genuine unit's valve should open properly at the rated temperature; failure to open (or opening at the wrong temperature) indicates a fake or defective part ⁵⁶. Note that professional-looking packaging is not proof of authenticity — it can conceal low-quality goods ⁵.

Media

Photo of thermostat internals showing the spiral spring element, used to assess authenticity

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Sources

This page is compiled from 6 community messages. Every fact carries a numbered reference to its original author and message.

Last updated: 2026-07-24