5 Signs Your Heat Pump Has a Defrost System Problem
Ice covering more than 30% of the outdoor coil that does not melt after 2-3 defrost cycles indicates
1. Thick Ice Coating the Outdoor Unit
Ice covering more than 30% of the outdoor coil that does not melt after 2-3 defrost cycles indicates a defrost system failure.
2. No Steam During Defrost
When the defrost cycle activates, you should see steam or vapour rising from the outdoor unit. No steam means the defrost is not working.
3. Defrost Cycle Too Frequent or Too Long
Normal defrost cycles last 5-15 minutes every 60-90 minutes. Defrosts that run longer or more frequently indicate a sensor or control board issue.
4. Cold Spots Inside During Defrost
When the defrost cycle runs, the indoor temperature should stay relatively stable. A noticeable temperature drop during defrost suggests the defrost is too long or the auxiliary heat is not engaging.
5. Outdoor Fan Not Running
If the outdoor fan is not spinning when the system is in heating mode but not in defrost, the fan motor has failed — causing ice to accumulate much faster than normal defrost can manage.
Professional Inspection in Greater Vancouver
If you notice any of these signs, a professional inspection is the best next step. BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning provides thorough diagnostic inspections across Greater Vancouver. Our technicians assess your equipment condition and provide an honest recommendation — whether repair or replacement is the most cost-effective solution. Call (604) 330-3953 to schedule your inspection.
Safety Reminder
If you smell gas, suspect carbon monoxide or believe there is an immediate danger, leave the property and contact emergency services or the appropriate gas emergency authority. Do not remain inside — exit the building immediately and call for help from outside.