Diagnose your HVAC issue in seconds.

Stop guessing which HVAC part to replace.

Type a symptom — get the likely failed part, confidence score, and repair links for furnaces, air conditioners, heat pumps, ductwork, and more.

Trusted by homeowners and HVAC techs for fast, accurate diagnostics. No login required.

Diagnose your issue See how it works

No login required · Instant results · Built for real repair decisions.

Homeowners HVAC Technicians Property Managers Maintenance Teams

🔥 Furnace: furnace not igniting furnace blowing cold air

❄️ AC: AC not cooling AC freezing up

🌡️ Heat Pump: heat pump not heating thermostat not responding

💨 Ductwork: no airflow from vent ductwork leaking air

⚡ Try it now — takes 5 seconds

No login required · Free · Instant results

Diagnose:

Example: "furnace not igniting" → Igniter (95%)

furnace not igniting AC not cooling heat pump not heating no airflow from vent thermostat not responding condenser fan not spinning

↓ See how it works

Quick checks for common hvac issues

These checks help confirm the likely fix before you buy a part.

Furnace not igniting

Check if the thermostat is calling for heat

Check the furnace filter

Look for a flashing error code on the control board

AC not cooling

Check if the thermostat is set to cool

Check the air filter

Check if the outdoor unit fan is running

No airflow from vent

Check if the blower is running

Check the air filter for blockage

Check if vents are open and unblocked

Why homeowners use RepairIQ for HVAC

When your furnace won't ignite or AC stops cooling, the hardest part isn't buying the replacement. It's figuring out what actually failed. RepairIQ closes that gap.

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Describe the problem

Type the symptom in plain English — "furnace not igniting" or "AC not cooling" — instead of searching forums and YouTube.

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Get the likely part

RepairIQ matches the issue to the most likely failed component and explains why it fails.

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Order the right part

Jump straight to Amazon with the right search — stop guessing and ordering the wrong part.

The old way vs RepairIQ

Without RepairIQ

❌ Search Google, YouTube, forums
❌ Call an HVAC tech ($150+ visit)
❌ Call an HVAC tech ($150+ visit)
❌ Guess the part
❌ Order wrong, wait, repeat

With RepairIQ

✅ Type the symptom
✅ Get the likely part instantly
✅ See confidence score
✅ Click supplier link
✅ Done — fix it yourself

Start your hvac diagnosis

Stop guessing. Start with the symptom.

Diagnose your hvac issue