AC Not Turning On — What to Check | HeatLand Metro Vancouver

AC not turning on in Metro Vancouver — what to check yourself and when to call HeatLand for professional diagnosis and repair.

Why an AC or heat pump won’t turn on

A cooling system that won’t start has a cause somewhere in the chain from thermostat signal to electrical panel to control board to compressor and fans. Most causes are diagnose-and-fix rather than full replacements. The checklist below covers what you can safely check before calling — everything beyond that requires a licensed HVAC technician.

What you can safely check

If the system still won’t start after checking those, the cause is electrical or mechanical — capacitor, contactor, control board, or compressor. Do not open electrical compartments yourself. Call HeatLand for a diagnostic.

Frequently asked questions about AC not turning on

Why is my AC not turning on?

Common reasons: the circuit breaker has tripped (check the electrical panel); the thermostat is in the wrong mode or the batteries are dead; the system’s float switch has tripped due to a blocked condensate drain; the outdoor disconnect switch has been turned off; or there’s a blown capacitor or failed contactor. Start with the breaker and thermostat, then call HeatLand if those are fine.

What should I check first if my AC won’t start?

1. Check the thermostat: is it set to COOL or AUTO, is the set temperature below room temperature, and are the batteries fresh? 2. Check the circuit breaker panel for a tripped breaker — reset it once if tripped. 3. Check the indoor air handler for a lit float switch indicator (a blocked drain). 4. Check that the outdoor disconnect switch (near the outdoor unit) is in the ON position. If all of those check out, call HeatLand for a service call.

My AC breaker keeps tripping — is that dangerous?

Yes — a breaker that trips repeatedly is protecting your home from an electrical fault. Common causes are a failing capacitor, a drawing compressor, or an electrical short. Do not keep resetting a repeatedly tripping breaker. Call HeatLand for a diagnostic.

Can I diagnose a failed AC capacitor myself?

You can observe symptoms (AC tries to start but hums and shuts off; outdoor fan runs but compressor won’t start) but capacitors store dangerous charge even when the power is off. Capacitor diagnosis and replacement must be done by a licensed HVAC technician. Do not open the electrical compartment of your outdoor unit.

How much does it cost to diagnose an AC that won’t turn on?

A service call in Metro Vancouver is typically $100–$200. The most common fix — capacitor replacement — is typically $150–$350 including parts and labour. More complex electrical issues (contactor, control board) run higher. HeatLand provides a written estimate before any repair begins.

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