The defrost cycle is a heat pump function that melts frost or ice on the outdoor coil in cold weather. It briefly reverses the refrigeration cycle to warm the coil, restoring airflow and heat transfer so the system can keep heating efficiently.
/dɪˈfrɒst ˈsaɪkəl/
The defrost cycle is a heat pump function that melts frost or ice on the outdoor coil in cold weather. It briefly reverses the refrigeration cycle to warm the coil, restoring airflow and heat transfer so the system can keep heating efficiently.
Why does a heat pump go into defrost mode?
To melt ice on the outdoor coil so it can absorb heat and run efficiently.
Source: The Cooling Company
Defrost keeps the outdoor coil clear for efficient heating.
On freezing days, a heat pump may frost over; the defrost cycle activates automatically to melt ice and maintain heating performance.
Keep the outdoor unit clear of snow and debris so defrost can work properly.
“Keep the outdoor unit clear of snow and debris so defrost can work properly.”
Smart defrost controls reduce cycle frequency by running only when needed.
Is it normal to see steam from the outdoor unit?
Yes. Steam during defrost is normal as ice melts off the coil.
How long should a defrost cycle last?
Usually a few minutes. Longer or frequent cycles may need service.
Can I stop the defrost cycle?
No. It’s automatic and necessary for safe, efficient operation.
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