Mini Split Not Heating in Greater Vancouver

A mini-split that does not heat is among the most frustrating cold-weather problems in Greater Vancouver homes — and the cause is often as simple as a mode setting or a defrost cycle.

What This Means

Mini-splits heat by reversing the refrigerant flow — extracting heat from outdoor air and delivering it inside. When heating fails, the reversing valve, refrigerant charge, defrost cycle, or thermostat may be the cause.

Common Causes

• Remote set to COOL or fan-only mode
• Reversing valve stuck in cooling position
• Defrost cycle running — unit produces cool air for 2 to 5 minutes during defrost (normal)
• Refrigerant low — insufficient charge for adequate heat extraction from outdoor air
• Outdoor unit fully iced — defrost system not working
• Error code active — unit locked out until fault is resolved

What Homeowners Can Check Safely

• Confirm remote mode is set to HEAT
• Wait 10 minutes after startup — if the unit was in defrost when you checked, it should return to heating mode
• Look at the outdoor unit — heavy ice accumulation suggests a defrost problem

When to Call a Licensed Technician

Air conditioning and mini-split systems contain refrigerant under pressure and electrical components at line voltage. Do not open refrigerant circuits, attempt to recharge the system, or bypass safety controls — these require a certified technician.

• Reversing valve coil testing and replacement
• Refrigerant pressure testing
• Defrost board and sensor testing
• Outdoor fan motor testing

Frequently Asked Questions

My mini-split shows HEAT mode but blows cold air. Why?

Continuous cold air in HEAT mode (after waiting past the defrost cycle) usually means the reversing valve is stuck in the cooling position. The valve is energized to switch direction; if the coil fails or the valve is mechanically stuck, the unit provides cooling regardless of the thermostat setting.

At what outdoor temperature does a mini-split stop heating in Greater Vancouver?

Standard mini-splits lose efficiency below 0 degrees Celsius. Cold-climate models operate effectively to minus 15 to minus 25 degrees Celsius. In Greater Vancouver, where temperatures rarely drop below minus 5 degrees, a standard mini-split is adequate for most winters.

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