🔍 Troubleshooting Wizard

AC Troubleshooting Wizard

Describe your AC symptoms to see why is my AC not cooling, with AC troubleshooting guidance,
likely causes, and recommended next steps before calling a technician.

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Instant results
Free to use
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AC Troubleshooting Wizard
Which AC issue are you having? Answer a few quick questions to help identify the most likely cause of your air conditioner problem and what to do next.
When you check your thermostat, what do you notice?
What sound do you hear from your AC unit?
How is the airflow from your vents?
When did you last have professional maintenance?
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🔍 Diagnosis Ready
AC Troubleshooting Results
Most Likely Cause
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Common AC Problems & Causes

AC Running But Not Cooling

Low refrigerant due to a leak — a common AC problem that needs professional diagnosis
Dirty or frozen evaporator coil — often linked to skipped AC maintenance
Blocked condenser coils (outdoor unit)
Failed compressor
Thermostat set incorrectly

AC Making Unusual Noises

Banging/clanking: loose or broken internal component
Squealing: worn fan belt or motor bearing (see our guide on common AC noises and what they mean)
Hissing: possible refrigerant leak, a key sign in our repair or replace decision guide
Clicking: relay or electrical control issue

AC Leaking Water

Clogged condensate drain line — a routine part of seasonal AC tune-ups
Frozen evaporator coil that has thawed
Cracked drain pan

DIY Checks Before Calling a Technician

✅ Check These First (No Tools Required)
Replace or clean your air filter (every 1–3 months) — part of our full AC maintenance checklist
Check thermostat — set to “Cool” and below room temperature
Check circuit breaker for a tripped breaker – especially after a power outage
Clear debris from around the outdoor unit (maintain 2 ft clearance)
Check that all supply and return vents are open

When to Call an HVAC Technician

AC is blowing warm air after checking filter and thermostat read our common AC problems breakdown
You hear hissing sounds (potential refrigerant leak)
Water is leaking from the indoor unit call for emergency AC repair
The system won’t turn on after checking breakers this may signal it’s time to repair or replace your AC
The system hasn’t been serviced in over 2 years check the signs you need to replace your AC

FAQ : AC Troubleshooting

Why is my AC freezing up?

Ice forming on your AC is almost always caused by restricted airflow or low refrigerant. Check your air filter first — a clogged filter is the most common cause.

Signs include barely cool air, ice on the unit, and hissing sounds refrigerant handling in Ontario is regulated, per Ontario’s refrigerant certification rules and the home taking unusually long to cool. If levels are low, there is a leak that must be repaired see AC running costs in Canada for what ignoring it costs you refrigerant doesn’t get ‘used up’.

On very hot days (above 30°C) it’s normal. If the AC runs continuously without reaching set temperature on a moderate day, the system may be undersized confirm sizing with our right AC size guide

If your AC can’t be economically repaired, a heat pump installation may offer
better long-term value with rebate eligibility

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Connect with trusted local HVAC contractors in your area. Get 3 free quotes — no obligation.

💰 Rebates Available

Canadian homeowners may qualify for up to $5,000 in federal and provincial rebates on qualifying systems.