Refrigeration · 5 min read
Fridge freezer icing up — causes and safe fixes
Door seal checks, defrost drain blockages, and when the defrost heater has failed.
Safety first — do not use the appliance
If you smell gas, call the National Gas Emergency Service on 0800 111 999. For immediate danger call 999.
This guide walks through the safe checks you can do yourself before booking a professional repair. If any step feels beyond you, stop and book a visit.
Step-by-step checks
- Check the door seal. Close the door on a strip of paper — if you can pull it out without resistance, the seal is failing.
- Clear the defrost drain. A small hole at the back of the freezer. If blocked, water refreezes into ice sheets.
- Manual defrost. Unplug and empty the freezer, leave door open for 6–8 hours over towels.
Safety notes
- Never chip ice with a knife or screwdriver — you can pierce refrigerant pipes.
- Refrigerant work is only carried out by qualified engineers.
When to book a repair
If defrost drains are clear and seals hold paper firmly but the ice returns within days, the defrost heater or thermostat is at fault.