Heil Furnace Troubleshooting

Is your Heil furnace not functioning as it should be? It may be time to troubleshoot some of the most common issues that the gas furnace is experiencing. And no, not all issues call for an HVAC guy to fix it; you can take care of several issues all by yourself.

However, that’s not to say you should be doing everything yourself – many issues are too complicated for homeowners to fix easily. But more on that later. Let’s look at the common issues first and how to troubleshoot them yourself.

Common Issues and How to Troubleshoot Heil Furnaces

  • Issue: The furnace does not heat.
  • How to troubleshoot:
    • Examine the igniter for any visible signs of damage or discoloration, noting that a functioning igniter typically emits a bright orange glow.
    • Conduct a continuity test using a multimeter. A lack of continuity indicates that the igniter needs to be replaced.
    • Handle the igniter gently during inspection to prevent any accidental breakage.

  • Issue: The furnace fails to ignite or heat properly.

  • How to troubleshoot:

    • Check that the gas control valve is open and that there is a continuous supply of gas.

    • Utilize a manometer to measure the gas pressure, ensuring it meets the specified requirements for your model (around 4 inches of water column for natural gas).

    • Inspect the gas line for any obstructions or leaks that might impede gas flow.

  • Issue: The furnace is unresponsive or doesn't turn on.

  • How to troubleshoot:

    • Check for a steady indicator light on the control board to verify if power is reaching the furnace.

    • Inspect your home’s electrical panel for any tripped breakers or blown fuses and address as needed.

    • Ensure that the furnace's external power switch is in the "on" position and is securely connected.

  • Issue: The furnace starts but shuts down soon after.

  • How to troubleshoot:

    • Remove and clean the flame sensor with a fine abrasive pad to eliminate any residue that might prevent it from detecting a flame.

    • Test the flame sensor for continuity using a multimeter. Replace the sensor if it does not pass this test.

  • Issue: The furnace stops working shortly after starting, or fails to exhaust air properly.

  • How to troubleshoot:

    • Listen for any unusual sounds from the exhaust motor, or check if it's operating silently, which could indicate a problem.

    • Check for any blockages in the fan or exhaust pipe of the inducer motor that could restrict airflow.

    • Use a multimeter to check for electrical continuity in the motor. Consider replacing the motor if it fails this test.

  • Issue: The furnace frequently cycles on and off.

  • How to troubleshoot:

    • Examine the pressure switch hose for any signs of wear or damage that might affect its ability to detect pressure changes.

    • Ensure that the hose and the port on the inducer assembly are free from clogs.

    • Test the pressure switch with a multimeter to confirm it closes at the correct pressure levels. Replace if necessary.

  • Issue: The furnace behaves erratically or does not respond to controls.

  • How to troubleshoot:

    • Look over the control board for any signs of damage or burnt components.

    • Use a multimeter to check the functionality of relays and the correctness of voltage outputs.

    • If the control board appears to be faulty or damaged, replacing it might be necessary.

  • Issue: Room temperature is inconsistently regulated, affecting furnace operation.

  • How to troubleshoot:

    • Ensure the thermostat is properly set and calibrated to prompt furnace operation.

    • If the display is unresponsive, replace the batteries.

    • Conduct a continuity check with a multimeter. A failed test of the thermostat calls for a replacement.

  • How to troubleshoot:

    • Change the air filter regularly—every few months or more often in dusty environments or homes with pets.

    • Make sure all vents and registers in the home are open and unobstructed to maintain effective airflow.

Understanding Error Codes and Indicator Lights

Error codes on a Heil furnace are communicated through a series of LED flashes on the control board, helping users identify specific operational issues. Let’s look at the error codes:-

LED Flash Patterns and What They Signify

1. LED flashing like a heartbeat

  • Meaning: The control has 24 VAC power.

  • Recommended Response: This is a standard status indicating that power is properly supplied to the control board; no further action is required unless additional codes are displayed.

2. Two LED flashes

  • Meaning: The unit’s pressure switch didn’t open.

  • Recommended Response: Inspect for an obstruction in the pressure tubing. Verify the functionality of the inducer motor and ensure no blockages are affecting the airflow.

3. Three LED flashes

  • Meaning: The unit’s pressure switch didn’t close or has reopened.

  • Recommended Response: Possible causes include excessive wind, improper vent size, malfunctioning inducer motor, defective pressure switch, insufficient combustion air supply, or disconnected or blocked pressure tubing. Investigate these elements and resolve any discrepancies.

4. Four LED flashes

  • Meaning: Limit circuit fault; either a limit or flame rollout switch is open.

  • Recommended Response: Investigate for issues such as a restricted vent, unsecured blower wheel, high wind conditions, a clogged air filter, or a malfunctioning blower. Rectify any problems to restore functionality.

5. Five LED flashes

  • Meaning: An abnormal flame proving signal; the flame is detected while the gas valve is de-energized.

  • Recommended Response: Examine for a leaky gas valve or a gas valve that remains open. This condition typically necessitates a professional evaluation and repair.

6. Six LED flashes

  • Meaning: Failure to ignite or loss of flame sensor signal during operation.

  • Recommended Response: Examine components such as an improperly grounded flame sensor, faulty hot surface ignitor, issues with control ground continuity, inadequate flame carryover, or rough ignition. Address the identified issue specifically.

7. Seven LED flashes

  • Meaning: Limit circuit lockout.

  • Recommended Response: This lockout occurs if the limit or flame rollout switch remains open for more than 3 minutes. The control will automatically reset after 3 hours. Assess the airflow and component operation to pinpoint the root cause.

8. Eight LED flashes

  • Meaning: Gas heating lockout; the control will not auto-reset.

  • Recommended Response: Inspect for incorrect wiring of the gas valve or a faulty control valve. This severe issue often requires intervention from a professional technician.

9. Ten LED flashes

  • Meaning: Polarity reversal detected.

  • Recommended Response: Consult installation instructions to correct any polarity issues, ensuring all electrical connections are accurate.

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Additional Error Code Combinations

1 + 2 LED flashes

  • Meaning: Blower is active post power-up.

  • Recommended Response: This occurs if the unit powers up during a heat call or opens while the blower is on delay.

6 + 1 LED flashes

  • Meaning: Ignition lockout.

  • Recommended Response: The control will reset after 3 hours. Ensure proper ignition processes are followed and check for faults.

LED Status Indicators

LED is off

  • Meaning: The secondary voltage fuse is open.

  • Recommended Response: Verify the door switch is closed or look for a short circuit. Replace the fuse if necessary.

LED is on

  • Meaning: Control circuitry lockout.

  • Recommended Response: Will reset automatically after 1 hour. If the problem continues, reset power to clear the lockout and consider replacing the control if the status code recurs.

LED is solid

  • Meaning: Issues with gas valve relay, flame sense circuit, or software error.

  • Recommended Response: Reset power to clear the lockout and replace the control if the error persists.

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Should you call an HVAC professional? When should you call?

Maintaining an efficient and reliable HVAC system is crucial for the comfort and safety of your home. While some problems might be solvable through straightforward troubleshooting, there are instances where professional expertise is much needed. Here are tips from Comfort Union, a leader in HVAC solutions, on when to call for help from a professional:

  1. Persistent Issues

Repeatedly addressing the same HVAC issue might indicate underlying complexities that require expert diagnosis and a more durable solution.

  1. Lack of Heat or Irregular Heating Performance

If your furnace ceases to produce heat or operates inconsistently, this could point to major issues such as malfunctioning ignition systems or a compromised heat exchanger, necessitating professional repair for safety and efficiency.

  1. Seeking Enhanced Energy Efficiency

An unexpected rise in energy bills, despite usual usage patterns, suggests that your heating system may not be operating efficiently. A professional evaluation can help homeowners get recommendations for repairs or updates that enhance efficiency and lower operating costs.

  1. Scheduled Annual Maintenance

Regular, professional maintenance is recommended to extend the lifespan of your HVAC system and ensure it operates at peak efficiency. This preventive measure can help avoid unforeseen issues.

  1. When Installing, Upgrading, or Undertaking Major Repairs

If you need new systems installed in your house, or you want significant upgrades or major repairs – it should always be conducted by professionals. These processes require specific skills and tools to ensure safety and compliance with local regulations.

dong Lauredodong Lauredo
05:09 13 Oct 24
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William HucmanWilliam Hucman
00:23 07 Oct 24
My hot water tank failed on a Friday evening. Had spent some time on Saturday morning calling a number of service companies and Comfort Union was one of the quickest to respond and able to execute the work over the weekend. The gentlemen that showed up were very friendly, completed the work in a timely manner, left no damage and cleaned up after the work was complete. Great experience with Comfort Union!
Trang LeiTrang Lei
04:33 06 Oct 24
We strongly recommend that Comfort Union attends to your residential heating, plumbing, and electrical services. Our tank water heater broke down on the weekend. On Monday, we called a few large companies, and all their estimates were on par or above the price point for the following tankless water heaters: Navien NPE-240A2, Rinnai RXP199iN, Rheem CRTGH95DVLN-3, AOSmith ATHR-199X3. During our online search, we encountered a hidden gem: Comfort Union, a small, family-oriented business with competitive and affordable pricing. They strive to adhere to a strict moral code that values integrity, fairness, and straightforwardness. We had the pleasure of meeting Asif, who was patient and took the time to address all our questions, concerns, and needs. He assessed the situation and recommended the most suitable tankless water heater option.We were not pressured to buy products – Asif was genuine and transparent. He used his expertise to guide our decision-making, always considering our needs and best interests. Ultimately, we decided on the Rinnai RX199iN SENSEI® RX Series. This model from Rinnai, a frontrunner in the industry, offers higher efficiencies, higher BTU output, better pairing with existing systems, and forward-thinking technologies. These unique features have truly enhanced our home comfort and reduced our energy bill. Asif and his team were excellent. Their workmanship, craftsmanship, and customer service are unparalleled. With their engineering backgrounds, they combine their vital knowledge to ensure our installation process is of the highest quality and standard. A special thanks to Asif, who worked tirelessly and meticulously to ensure all components were correctly installed and even took extra effort to reposition the water supply line and pipe at no additional cost. These thoughtful additions demonstrate their attention to detail and commitment to customer satisfaction, making us feel valued and important. Their commitment to our satisfaction was evident throughout the process, making us feel truly important. Thanks to their professionalism and expertise, the entire process was smooth and hassle-free. Their service was not only quick and reliable but also very affordable.  This affordability, coupled with their superb customer service, a key factor that sets them apart, will make me use them for all my residential heating, plumbing, and electrical services needs. Our experience with Comfort Union has been nothing short of exceptional. We couldn't be more satisfied!
Andrea MendrosAndrea Mendros
16:45 04 Oct 24
I recommend this with a Heart. Found this site in goggle. And they did a very good job.
Abdel Aziz FarahAbdel Aziz Farah
17:54 02 Oct 24
Asif and Ismail were awesome came in let me know everything I needed and it was a smooth install. Would highly recommend them to anybody!!!
Ab CaAb Ca
04:01 30 Sep 24
I recently had the pleasure of working with Comfort Union for three major installations in my home—a new heat pump, a tankless water heater, and a furnace—and I couldn't be happier with the entire experience!Heat Pump Installation:From the first consultation, Comfort Union’s team impressed me with their knowledge and transparency. I decided to upgrade to a heat pump because I wanted to improve energy efficiency and take advantage of both heating and cooling from one system. The team carefully assessed my home’s layout and explained every step of the process, including how the heat pump would function in Calgary’s colder climate. They even took the time to break down the cost savings I could expect over time.The installation was seamless. The technicians were punctual, professional, and clearly experts in their field. They worked efficiently, ensuring that all components were correctly installed, and even took extra care to tidy up after themselves. They walked me through the setup, explaining how to use the system, and answered all of my questions patiently. Now, I enjoy year-round comfort with a system that’s quiet, effective, and eco-friendly!Tankless Water Heater Installation:I also had Comfort Union install a tankless water heater (Rinnai RXP199), and it’s been a game-changer for my household. No more waiting for the water to heat up or running out of hot water during long showers—this tankless system delivers endless hot water on demand!Their installation team was fantastic. They emphasized the importance of proper installation for efficiency and to protect the warranty, which gave me peace of mind knowing I was in good hands. I appreciated that they took the time to explain the maintenance needs to ensure the system stays in top shape for years to come. Plus, they added smart touches like installing a drier filter for extra protection against Calgary’s colder months.Furnace Installation:Lastly, I had Comfort Union replace my old furnace, and wow—what a difference it’s made! They recommended a high-efficiency model based on my home’s size and heating needs, and it has drastically improved my energy bills. The new furnace is powerful yet super quiet, and I can already feel the consistent warmth throughout my house.I can’t stress enough how smooth this installation went. The team was respectful of my space, even laying down mats to protect my floors. They installed a new programmable thermostat and made sure everything was running perfectly before leaving. They also included a comprehensive warranty and provided advice on how to keep the system running efficiently for years.Overall Experience:What I love most about Comfort Union is how they combine their technical expertise with a personal touch. From the friendly office staff to the knowledgeable technicians, everyone I interacted with was professional, courteous, and genuinely cared about my comfort. I also appreciate that they offer full coverage with their installations, including maintenance plans, which makes me feel even more confident in my investment.If you’re looking for a reliable, family-run HVAC company that truly puts customers first, I highly recommend Comfort Union. Their workmanship, attention to detail, and top-notch service exceeded all my expectations. Whether you need a new heat pump, tankless water heater, or furnace, you won’t be disappointed!
Pramila YesudasPramila Yesudas
03:26 30 Sep 24
Asıf and team replaced our hot water tank very quickly and efficiently. Asif was very professional and communicated well with us. Asıf is knowledgeable, I would definitely recommend comfort union heating and plumbing company to others. Thank you Asıf for your quick and responsible work.
Rych 1821Rych 1821
01:19 20 Sep 24
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Omolade AjetunmobiOmolade Ajetunmobi
05:13 19 Sep 24
Both Moe and Ben were really good and they completed the heat pump install in a timely manner. Very professional and kept our place clean afterwards.
Pablo GPablo G
01:15 18 Sep 24
Tankless Water Heater: Very happy and impressed with how quickly Asif came out to assess the problem, with his knowledge and the response time to quote and install a replacement unit. No pressure sales and upfront pricing with no surprises. I had a quote from another ‘Rinnai Approved’ company who flip-flopped on the work scope, upgrades and advised on new venting (at great cost) that was simply not needed. The tech (Mo) did a good job removing and installing the new unit and so far the unit has been working great.
Glen RGlen R
17:46 07 Sep 24
I recently had the pleasure of working with Comfort Union Heating and Plumbing, and I can’t say enough about the exceptional service I received. Led by Asif, the team was incredibly meticulous in their work, ensuring that every detail was attended to.Their attention to detail and commitment to quality work were evident from start to finish. If you’re looking for reliable and skilled service in heating and plumbing, I highly recommend Comfort Union Heating and Plumbing. Thank you, Asif, Muhammad and the team, for a great experience!
Chris EllettChris Ellett
13:28 06 Sep 24
I had a great experience with comfort union. Even over the long weekend they answered the phone, and were there the next day to replace my hot water tank. Moe called in the morning to give me an ETA and then a text when he was actually on the way. He was thorough, friendly, knowledgeable and would use this family run business again
Berta SiposBerta Sipos
02:20 05 Sep 24
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SamiurSamiur
20:24 04 Sep 24
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Charles KabanoCharles Kabano
19:12 01 Sep 24
Comfort Union just finished up HVAC work for the secondary suite basement for us in Airdrie, and I gotta say, these guys did a fantastic job. They installed a new Carrier furnace, moved our old Trane to a different spot, and hooked us up with a Lennox AC. Everything was smooth, and they really knew what they were doing.I love that they’re a family business—and really care about their work and their customers. The crew was super friendly and easy to talk to, and they made sure to explain everything along the way. The new furnace and AC are working great, and moving the old unit seemed like no big deal for them.Overall, just a great experience. If you need any HVAC work done in Airdrie, these are the people to call. Can’t recommend Comfort Union enough!
KyleKyle
21:57 29 Aug 24
Vic DePazVic DePaz
01:09 28 Aug 24
Comfort Union team was awesome to deal with and loved they are Calgary family run business. I will greatly recommend them. Great work.
Kathleen VinluanKathleen Vinluan
01:26 24 Aug 24
Quick and Reliable.
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