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FAQ

What causes ice build-up on an upright fridge evaporator?

Updated 19 May 2026 FAQs Reviewed for Unifrost.ie
FAQ
Quick answer

Evaporator ice build-up is almost always caused by moisture getting into the cabinet and then freezing on the cold coil. In busy Irish kitchens the most common triggers are:

Support note

This FAQ is designed for a fast answer first. Use the related guide links if you need the fuller decision path behind the short version.

Evaporator ice build-up is almost always caused by moisture getting into the cabinet and then freezing on the cold coil. In busy Irish kitchens the most common triggers are:

Frequent or long door openings that pull warm, humid air into the fridge.

Damaged, dirty, or misaligned door gaskets letting air leak in even when the door is “closed”.

Overloading or blocking airflow (product pushed against the back wall, vents covered, shelves packed too tightly).

A blocked condensate drain or drain pan issue, causing water to sit and re-freeze.

Defrost system problems (timer/controller settings, sensor/probe, heater, or wiring), which prevents normal melt-off.

Light, even frosting can be normal, but thick ice that blocks airflow points to an underlying air leak, usage issue, or defrost fault.

Read the full guide: Troubleshooting Ice Build-up in Unifrost Upright Fridges: A Guide for Irish Kitchens.

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