Introduction
When your furnace stops working in the middle of a Canadian winter, it can feel like an emergency. Fortunately, modern Tempstar furnaces are designed with built-in diagnostic systems that display error codes to help identify problems quickly. These Tempstar Furnace Error Codes: A Complete Troubleshooting Guide will help you understand what the flashing lights on your unit mean, how to troubleshoot issues, and when it’s time to call in the professionals at GM HEATING AND COOLING INC.
Whether you’re dealing with ignition failures, airflow problems, or electrical issues, knowing how to interpret Tempstar furnace error codes can save you time, money, and stress.
About Tempstar Furnaces
Tempstar is a trusted name in the heating and cooling industry, producing reliable, high-efficiency furnaces that are especially popular in Canada. As part of the International Comfort Products (ICP) group, a division of Carrier Global, Tempstar offers advanced HVAC technology with a reputation for durability.
Key features of Tempstar furnaces include:
- High Efficiency: Many models boast AFUE ratings up to 98%, helping homeowners reduce energy costs while staying warm in freezing temperatures.
- Smart Diagnostics: Tempstar furnaces come equipped with LED-based self-diagnostic systems that make troubleshooting faster and more accurate.
- Quiet Comfort: With variable-speed blowers and insulated cabinets, Tempstar furnaces run quietly while delivering consistent warmth.
Thanks to these features, Tempstar furnaces remain a top choice for Canadian homeowners seeking dependable comfort during harsh winters.
How Tempstar Furnace Error Codes Work
Tempstar furnaces use a control board with an LED indicator that flashes in specific sequences to alert you to issues. Each sequence—whether it’s a series of short or long flashes—corresponds to a particular error code.
To read the error codes:
- Make sure the furnace has power.
- Open the furnace’s access panel to find the control board.
- Observe the LED light pattern.
- Count the flashes and refer to this Tempstar Furnace Error Codes: A Complete Troubleshooting Guide for meaning and fixes.
Interpreting these signals correctly can help you identify whether the issue is minor and DIY-fixable, or if professional help is required.
Tempstar Furnace Error Codes: A Complete Troubleshooting Guide
Here’s a detailed breakdown of the most common Tempstar furnace error codes, what they mean, and how to troubleshoot them.
1 Flash – Ignition Failure
Meaning: The furnace failed to ignite after multiple attempts.
Causes:
- Dirty or cracked ignitor
- Gas valve not opening
- Clogged burners
Fix:
- Clean or replace the ignitor.
- Ensure the gas valve is turned on and functional.
- Clean burner assembly.
2 Flashes – Pressure Switch Stuck Open
Meaning: The control board detects an open pressure switch when it should be closed.
Causes:
- Blocked venting
- Faulty inducer motor
- Damaged pressure switch tubing
Fix:
- Check vent pipes for blockages.
- Inspect the inducer motor.
- Replace damaged pressure switch parts.
3 Flashes – Pressure Switch Stuck Closed
Meaning: The switch remains closed when it should be open.
Causes:
- Debris in tubing
- Airflow restrictions
- Faulty pressure switch
Fix:
- Clear tubing blockages.
- Inspect venting and airflow.
- Replace switch if necessary.
4 Flashes – High Limit Switch Open
Meaning: The furnace overheated and the limit switch shut it down.
Causes:
- Dirty air filter
- Blocked vents or ductwork
- Blower motor malfunction
Fix:
- Replace the air filter.
- Ensure vents are open.
- Call a technician to inspect blower motor and heat exchanger.
5 Flashes – False Flame Detection
Meaning: The control board senses a flame when no gas is flowing.
Causes:
- Dirty flame sensor
- Shorted wiring
- Gas valve stuck open
Fix:
- Clean the flame sensor.
- Inspect and repair wiring.
- Replace the gas valve if required.
6 Flashes – Rollout Switch Tripped
Meaning: Excessive heat near the burners triggered the safety switch.
Causes:
- Blocked exhaust vent
- Cracked heat exchanger
- Burner issues
Fix:
- Reset the rollout switch.
- Clear exhaust blockages.
- If the switch trips repeatedly, contact GM HEATING AND COOLING INC immediately for safety inspection.
7 Flashes – Ignition Lockout Due to Flame Loss
Meaning: The flame sensor failed to detect a stable flame.
Causes:
- Low gas pressure
- Faulty flame sensor
- Defective gas valve
Fix:
- Clean or replace the flame sensor.
- Check gas supply.
- Replace gas valve if necessary.
8 Flashes – Low Voltage Detected
Meaning: Furnace is receiving insufficient voltage.
Causes:
- Circuit breaker issue
- Loose wiring
- Power supply problems
Fix:
- Check circuit breaker.
- Inspect thermostat wiring.
- Call an electrician if voltage remains low.
Continuous LED – Normal Operation
Meaning: The furnace is running as expected.
Fix: No action needed.
Preventing Tempstar Furnace Error Codes
Prevention is the best way to avoid inconvenient furnace breakdowns. Here are some essential tips:
- Replace air filters every 1–3 months.
- Keep vents and ducts clear of dust and debris.
- Schedule annual professional inspections with GM HEATING AND COOLING INC.
- Clean flame sensors and ignitors periodically.
- Check for unusual noises or repeated shutdowns, which may signal bigger issues.
When to Call a Professional in Canada
While some minor issues can be fixed with DIY troubleshooting, others require professional attention. Call GM HEATING AND COOLING INC if:
- Error codes keep repeating.
- The furnace locks out multiple times.
- You notice gas smells or suspect a cracked heat exchanger.
- Electrical issues like low voltage persist.
- Your furnace makes strange noises or refuses to restart.
Choosing professional HVAC service ensures your furnace runs safely, efficiently, and reliably during harsh Canadian winters.
Conclusion
Understanding Tempstar Furnace Error Codes: A Complete Troubleshooting Guide helps you diagnose issues quickly, keep your furnace running efficiently, and avoid costly emergency repairs. While simple fixes like changing filters or cleaning sensors can solve minor problems, more complex issues should always be handled by professionals.
For reliable furnace troubleshooting and repair services in Canada, trust GM HEATING AND COOLING INC. Our expert team is ready to keep your home warm, safe, and comfortable all winter long.
FAQs
Q1: What does a Tempstar furnace error code mean?
It’s a diagnostic signal from your furnace’s control board to alert you about specific malfunctions.
Q2: How do I read Tempstar furnace error codes?
Locate the control board LED, count the flash pattern, and match it with this Tempstar Furnace Error Codes: A Complete Troubleshooting Guide.
Q3: Can I fix Tempstar furnace error codes myself?
Some issues, like replacing filters or cleaning flame sensors, can be DIY, but gas leaks, cracked heat exchangers, and electrical problems require professional help.
Q4: What’s the most common Tempstar furnace error?
Ignition failure (1 flash) and airflow restrictions (4 flashes) are the most common.