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
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.
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.
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:
Persistent Issues
Repeatedly addressing the same HVAC issue might indicate underlying complexities that require expert diagnosis and a more durable solution.
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.
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.
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.
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.
Why Opt for Comfort Union?
Comfort Union is renowned for its team of certified, experienced technicians capable of handling all facets of HVAC maintenance and repair. Committed to excellence and customer satisfaction, Comfort Union ensures reliable service and professional guidance.
