A fogged-up machine window is not always a fault. Sometimes it is just humid air.
Condensation forms when humid air meets a cold surface – the glass or the evaporator. In refrigerated machines, condensate from the evaporator drains into a tray and evaporates. Fog on the glass can happen in high humidity, but if it persists or water appears under the machine, report it.
Common causes
- High humidity in the room.
- A leaky door seal.
- A blocked condensate drain.
- A tilted machine.
When to report it
When water drips from the machine, fog does not clear, or frost forms on products. These usually mean a service visit is needed.
Glass on coolers
Some devices, such as vending coolers (publisher's site), have heated or insulated glass that limits fogging. The manufacturer has details.
FAQ
Does condensation harm products? On the glass, usually not, but moisture inside can damage packaging.
Can I clear the drain myself? Better to report it to the operator.