It’s a sign that the furnace is ON and doing its job well without any issues. ![]() Furnace flashes continually – and fast: This is what you want to see when heating your home.Note that all the codes below only apply if the furnace flashes green. However, you may want to keep an eye out for the common codes. It’s impossible to enumerate all error codes from all furnace types. If the manual doesn’t help, feel free to contact Lennox customer support. Additionally, check your owner’s manual to find out what the different flashes mean. It could be a sign of a healthy furnace or indicate a serious issue that requires immediate attention. The green flashing light on a Lennox flashing light means the same thing in most furnaces. What Does a Green Flashing Light Mean on a Lennox Furnace? If the flame rolls out of the chamber into undesignated areas, the furnace may shut down and later flash severally to inform you why the shutdown was necessary. For instance, the furnace employs a limit switch to guard against overheating and flame rollout. Compromised Safety Mechanismįinally, a blinking furnace light can also signal trouble in one of the numerous furnace safety mechanisms. However, before it fails, the furnace may flash severally and send you relevant error codes to help you fix the problem. Therefore, the heating process may fail to the individual components, microcircuits, or the primary circuit. The furnace comprises many electrical components and several small circuits that together form the furnace circuitry. When this happens, the furnace will eventually flash severally to warn you. Alternatively, you may have gas but at low pressure. Common supply issues include “no gas” incidents that may happen for various reasons, including supplier challenges, blocked gas lines, and a compromised gas valve. Gas/Fuel Supply IssuesĪ flashing LED light on your furnace can also be a sign of problems in gas supply. In addition to the flashing lights, ignition issues may also cause the furnace to fail to light. Maybe the burner is dirty, or the orifices are blocked. Or maybe it’s ON and working, but the burner system is compromised. The blinking light can also signal trouble in the ignition process. For instance, if it signals that the thermostat is missing yet you remember inserting it back after the last DIY troubleshooting, the thermostat may not be held firmly in position. It can also indicate the poorly positioned or missing thermostat. The blinking thermostat could point to a dead or malfunctioning thermostat. Generally, though, the gas furnace will blink if it encounters an issue in four primary areas, as follows A thermostat Problem It depends on the color of the flashing light, the number of times it flashes, and the type of furnace. The flashing light on your furnace could point to many different issues. Reasons the Light on your Furnace is Blinking However, if a green light is ON but continuous (no blinking), it’s usually a sign that the IFC circuit board is defective and needs replacing. Perhaps a plug or wire within the furnace is loose, or maybe the breaker circuit is tripped. ![]() Alternatively, It may mean that the furnace is switched ON but not getting any electric power to the board. In such furnaces, if the furnace is not lighting at all (no green, red, or yellow LED lighting), it’s a sign that the unit is OFF. ![]() It’s the ultimate sign that the furnace is generating enough heat to keep your home warming and hasn’t encountered any issues so far. If your furnace is in excellent working condition, currently switched ON, and working usually, it will blink green – but fast. However, generally, the furnace will blink even when running perfectly. The answer depends on the type of furnace. Should it be blinking? Should it be lighting bot not blinking? Or, should the light be off in the first place? What does the green flashing light mean, when should you be worried, and what can you do about the blinking furnace? Let’s begin with a simple question Should My Furnace Light Be Blinking? We want to focus on instances when the furnace is blinking green. It may even refuse to come back on, indicating the unit is in “lockout” mode. Sometimes it will blink and then go off right after. Indeed, if your furnace is blinking but still running, you should count yourself lucky. Although some furnaces blink even when in perfect shape, the flashing LED is often a sign of trouble.
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