Winter heat pump maintenance checklist
Winter is when your heat pump earns its keep, running almost constantly to heat your Metro Vancouver or Fraser Valley home through cold, wet, and sometimes snowy weather. That heavy demand makes ongoing winter care essential.
Winter maintenance is a bit different from other seasons. The focus shifts to snow and ice management, keeping airflow open, and understanding the defrost cycle so you can tell normal frost from a real problem.
HeatLand has kept heat pumps running through winter across the region since 1999. This checklist covers what to watch and do during the season, plus the warning signs that mean it’s time to call a technician.
Snow, Ice, and Clearance
The outdoor unit runs all winter, so keeping it clear is your top job. Gently remove snow that piles up around, on top of, or against the unit after storms, and make sure the coil isn’t buried, since blocked airflow forces the system to work harder and can cause icing. Keep roughly two feet of clearance on all sides.
Raised installation helps in snowy conditions, but drifting snow can still bury a unit, so check it after heavy snowfall. Never chip at ice with sharp tools, which can puncture the coil; if ice has formed, let the defrost cycle or gentle warm water handle it, and call a technician if it won’t clear. Clear a safe path so you or a technician can reach the unit. Also make sure roof runoff and gutters aren’t dripping onto the unit, since repeated freezing there causes ice buildup. A few minutes of clearing after each storm prevents many winter problems.
Understanding the Defrost Cycle and Normal Frost
In winter, your heat pump will periodically frost over on the outdoor coil, and this is completely normal. To handle it, the system runs a defrost cycle: it briefly switches modes, may release visible steam, and the outdoor fan may stop for a few minutes. You might notice a whoosh or a short pause in heating. This is the system protecting itself, not a malfunction.
What’s not normal is thick, persistent ice that never clears, ice encasing the whole unit, or the coil staying frozen for long stretches. That points to a defrost control fault, low refrigerant, or blocked airflow, and running the unit iced up can damage the compressor. If you see heavy ice that the defrost cycle can’t resolve, or the system stops heating well, shut it off and call a licensed technician. Knowing the difference between routine frost and a genuine ice problem is one of the most useful things a winter heat pump owner can learn.
Filters, Airflow, and When to Call a Pro
Because the heat pump runs so much in winter, filters clog faster. Check the filter monthly and change or clean it as needed, since a restricted filter cuts heating performance right when you need it most and can contribute to icing. Keep indoor vents and registers open and unblocked so warm air circulates freely, and confirm the thermostat is set for comfortable, efficient winter operation.
Watch for warning signs throughout the season: weak or cool air on a heat call, short cycling, sudden bill spikes, unusual noises, or persistent ice. Safety note: never keep resetting a breaker that trips repeatedly, and if you notice any burning smell or a gas odour near backup heating equipment, shut things down and call a licensed technician immediately. Winter breakdowns are stressful and demand for service is high, so addressing early warning signs promptly matters. HeatLand provides emergency service across Metro Vancouver and the Fraser Valley when winter trouble strikes.
Quick Checklist
- Clear snow and ice from around the outdoor unit after storms
- Keep the coil unburied with 2 feet of clearance
- Change or clean the filter monthly during heavy use
- Confirm the defrost cycle clears frost normally
- Watch for persistent ice or weak heating
- Call a technician for ice that won’t clear or repeated breaker trips
| Winter Sign | Normal or Problem? | Action |
|---|---|---|
| Light frost on coil | Normal | Defrost cycle clears it |
| Steam during defrost | Normal | No action needed |
| Thick, persistent ice | Problem | Call a technician |
| Snow burying the unit | Problem | Clear gently, restore airflow |
| Weak heat or short cycling | Problem | Book service |
Frequently Asked Questions
Is it normal for my heat pump to ice up in winter?
Light frost on the outdoor coil is normal in cold, damp weather, and the defrost cycle clears it periodically. What’s not normal is thick, persistent ice that never melts or ice encasing the whole unit. That signals a defrost fault, low refrigerant, or blocked airflow and needs a technician before it damages the compressor.
Should I clear snow off my heat pump myself?
Yes, gently. Keep the outdoor unit clear of snow that piles around, on, or against it, and maintain clearance so it can breathe. Never chip at ice with sharp tools, which can puncture the coil. If ice won’t clear with the defrost cycle or gentle warm water, stop and call a licensed technician.
How often should I change the filter in winter?
Check it monthly, since heavy winter heating use clogs filters faster. Change or clean it as soon as it looks dirty. A restricted filter reduces heating performance when you need it most and can contribute to icing, so staying on top of filter care is especially important during the cold season.
What should I do if my heat pump stops heating in a cold snap?
First check the thermostat, filter, and whether the unit is buried in snow or heavily iced. If those are fine and it still won’t heat, or you see persistent ice, weak air, or a tripping breaker, shut it down and call for service. HeatLand offers emergency service across Metro Vancouver and the Fraser Valley.
Reviewed by the HeatLand Heating & Cooling team — licensed HVAC contractor serving Metro Vancouver & the Fraser Valley since 1999. This article is for general guidance only. If you smell gas, suspect a carbon monoxide leak, or are unsure about any electrical or gas component, stop troubleshooting immediately and call a licensed technician or 911.