Rated: 4.8 / 5

Read 100's of Reviews

Furnace Error Codes: Common Furnace Troubleshooting Codes and What They Mean

By: Team ProSolutions

Experiencing issues with your furnace? Even the most reliable and top-of-the-line furnaces experience problems from time to time. Luckily, furnaces have built-in safety features and the ability to communicate error codes. These furnace error codes can help you, and your Edmonton furnace repair professional, uncover specific issues. This makes furnace repairs faster and more cost-effective.

There are many different furnace brands, each with slightly different error codes. However, the way a code is read, and the errors that are communicated, are typically very similar. So, let’s take a look at some of the most common troubleshooting codes and what they mean.

How do you read a furnace error code?
Goodman Furnace Fault Codes
Trane Furnace Error Codes
Amana Furnace Error Codes
Lennox Furnace Error Codes
Ducane Furnace Troubleshooting Codes
Error Codes for RunTru Furnaces
AirEase Furnace Error Codes
Ameristar Furnace Error Codes

How do you read a furnace error code?

Although furnace error codes differ between brands, all the most popular furnace brands use a system of blinking lights to communicate error codes. To read a furnace error code, locate the LED light and note its blinking pattern. Be sure to count how many times the light flashes and to note how quickly it’s blinking. To determine what a particular light combination signifies, consult the installation guide for your particular furnace. Regular maintenance is crucial to keep your furnace running efficiently and to extend its lifespan.

To help you out, here are some of the most common error codes that Edmonton homeowners will come across.

technician fixing furnace ⋆ ProSolutions Inc

Goodman Furnace Fault Codes

Goodman furnaces come highly recommended by furnace specialists in Edmonton. The brand is well-built and reliable. But, as with any furnace, Goodman units can experience issues – especially since cold Alberta winters can take such a toll on these types of appliances.
If you run into problems with your Goodman unit, be sure to look for the fault code. Providing furnace error codes to your furnace repair specialist before they arrive will help them solve the issue faster.

Here are some common Goodman furnace fault codes you may come across.

Goodman Furnace Fault Code	Meaning	Potential Issue
Light ON	No signal from thermostat	Thermostat not properly connected, issue with thermostat setting
Light OFF	Control failure	No power, issue with connections
1 flash	Ignition error (retries exceeded) / Flame failure	Faulty or dirty flame sensor, faulty igniter, gas supply interruption, etc.
2 flashes	Pressure switch error (stuck closed)	Short in the pressure switch circuit, faulty pressure switch, draft inducer not working, etc.
3 flashes	Pressure switch error (stuck open)	Blockage in pressure switch hose, pressure switch hose improperly connected, loose wiring, induced draft blower operating when it shouldn’t be, etc.
4 flashes	Open high limit	Dirty filters, wiring issue, blockage in flue, etc.
5 flashes	Flame sensed with gas valve off (i.e. no call for heat)	Leaky gas valve, gas valve stuck open, defective flame sensor, etc.
6 flashes	Open rollout switch	Blocked or cracked heat exchanger, blocked vent, low gas pressure, etc.
7 flashes	Low flame error	Low gas pressure, faulty flame sensor, dirty flame sensor, etc.
8 flashes	Ignitor error	Faulty ignitor, ignitor not properly connected, wiring issues, etc.
9 flashes	Open pressure switch, induced draft blower on	Pressure switch hose cracked, blocked or improperly connected, faulty pressure switch, etc.
Continuous flashing	Reversed polarity	Issue with wiring

If you encounter recurring issues with your Goodman furnace, don’t hesitate to contact ProSolutions HVAC & Heating Experts In Edmonton. Many of our customers reach out with similar concerns, and we offer reliable alternatives that are just as efficient—or even better—than Goodman furnaces. Our experts will help you explore the best options for your home.

Trane Furnace Error Codes

Trane products, including furnaces and air conditioners, are some of the most reliable on the market. However, that doesn’t mean they don’t have problems.

To help you determine what’s going wrong with your Trane furnace, let’s take a look at some of the most common error codes.

What does a red blinking light on a Trane furnace mean?

Like many other top furnace brands, Trane uses a red blinking light to communicate error codes. A red blinking light can mean different things. The meaning is determined by the number of times the red light blinks, as well as how fast it is blinking.

Here are some Trane furnace error codes you might encounter.

Trane Furnace Error Code	Meaning	Potential Issue
Constant slow blinking	Furnace is functioning normally
Constant fast blinking	Furnace is functioning normally
Red light constant ON	Control failure	Control panel issue
Red light constant OFF	Check Power	Power off
2 blinks	Flame failure (retries exceeded)	Gas supply issue, flame rod not sensing flame, wiring issue, etc.
3 blinks	Pressure switch problem	Blockage in vent, condensate drain plugged, etc.
4 blinks	Temperature switch problem / Over temperature limit	Plugged filter, plugged secondary heat exchanger, ductwork issue, etc.
5 blinks	Flame sensed when no flame should be present	Leaky gas valve, stuck gas valve, defective flame sensor, etc.
6 blinks	115 VAC power reversed polarity, poor grounding	Issue with line voltage polarity or wiring, etc.
7 blinks	Gas valve circuit error	Gas valve issue
8 blinks	Low flame sense signal	Flame sensor malfunction, low gas pressure, etc.
9 blinks	Check igniter	Check igniter

Need help fixing an issue with your Trane furnace? The plumbing and heating experts at ProSolutions PHAC can help. Give us a call at 780-453-6640.

Amana Furnace Error Codes

Amana HVAC systems are also highly-dependable and efficient. Similar to Trane furnaces, Amana furnaces use a blinking red light to signify an issue with the unit.

Edmonton homeowners may come across these common Amana furnace error codes.

Amana Furnace Error Code	Meaning	Potential Issue
Constant red light	No signal from thermostat	No power, issue with connections
Constant flashing	Reversed polarity	Issue with wiring or line voltage polarity
1 flash	Flame failure / Lockout due to excessive ignition retries	Gas supply interruption, flame rod not sensing flame, wiring issue, etc.
2 flashes	Draft inducer not operating or pressure switch failure (closed pressure switch circuit)	Draft inducer not working, short in the pressure switch, blockage in vent, condensate drain plugged, etc.
3 flashes	Open pressure switch	Pressure switch needs to be replaced, pressure switch hose improperly connected or blocked, loose wiring, etc.
4 flashes	Pressure error / High limit error	Clogged air filter, drain tubes obstructed by debris or moisture, faulty wiring, etc.
5 flashes	Flame sensed without call for heat	Valve closing too slowly, etc.
7 flashes	Faulty flame sensor	Flame sensor dirty or too far from flame, etc.

Don’t be left out in the cold! The Amana furnace technicians at ProSolutions PHAC will have your unit fixed in no time. Call us at 780-453-6640.

Lennox Furnace Error Codes

Have a Lennox furnace at home? The Edmonton heating services experts at ProSolutions are familiar with the Lennox brand – and we’re here to help.

Here’s what you need to know if your Lennox furnace is on the fritz.

What does a blinking light on a Lennox furnace mean?

furnace error code light ⋆ ProSolutions Inc

Like Trane and Amana, Lennox furnaces are equipped with LED lights that are used to communicate issues. However, unlike Trane and Amana furnaces, Lennox HVAC systems use red and green lights to convey error codes. These lights flash in specific patterns to signify a particular issue.

If the red and green lights on your Lennox furnace are blinking simultaneously (quickly or slowly), this means that the furnace is functioning normally. All other patterns signify an issue that may require furnace repair.

How do you read Lennox error codes?

Lennox error codes are read based on the colour of the light that is flashing and how fast the light is blinking.

Here are some common error code patterns that you might see, along with details about what they mean.

Lennox Furnace Error Codes	Meaning	Potential Issue
Red light – flashing quickly Green light – flashing slowly	Reversed polarity	Issue with electrical wiring
Red light – flashing slowly Green light – flashing quickly	Low flame error	Issue with flame sense rod, dirty flame sensor, poor gas pressure, etc.
Red light – flashing slowly Green light – solid	High limit switch open	Plugged filter, dirty blower wheel, ductwork issue, etc.
Red light – off Green light – flashing slowly	Draft inducer or pressure switch failure	Blocked inlet or exhaust vent, cracked hose, draft inducer not working, short in power switch, etc.
Red light – on, on, off Green light – on, off, on	Circuit board failure	Issue with control panel or wiring
Red and green lights alternating, flashing slowly	Flame failure	Issue with pilot light or ignition sensor
Red and green lights alternating, flashing quickly	Issue with voltage	Improper main ground

Require assistance with your Lennox furnace? Our experts are here to help – 780-453-6640.

Ducane Furnace Troubleshooting Codes

Ducane furnaces are made by Lennox and are another popular choice among Edmonton homeowners. Like Lennox, Ducane furnaces use flashing LED lights (red and green) to communicate error codes. However, a green LED is only used to specify furnace error codes when there is a demand for high heat.

When facing an issue with your Ducane furnace, here are some furnace error codes you might run into.

Ducane Furnace Troubleshooting Code	Meaning	Potential Issue
Light ON	Normal operation
Light OFF	No power	Power off, issue with breaker, connections or fuse
1 flash	Flame present with gas valve off	Dirty flame sensor rod, valve closing too slowly, etc.
2 flashes	Pressure switch error (pressure switch closed with inducer off)	Issue with pressure switch, draft inducer not working, debris in the line, cracks in tubing, etc.
3 flashes	Low fire pressure, rollout or limit switch open	Blocked or cracked heat exchanger, blocked vent, low gas pressure, etc.
4 flashes	High limit switch open	Plugged filter, dirty blower wheel, etc.
6 flashes	Pressure switch cycle lockout	Faulty pressure switch, blocked vents or condensate drain pipe, etc.
7 flashes	Lockout due to no ignition	Faulty or dirty flame sensor, faulty igniter, dirty filter, etc.
8 flashes	Lockout due to too many flame dropouts	Dirty flame sensor, flame sensor or igniter failure
9 flashes	Polarity and phasing error	Issue with wiring
Green LED flashing	High heat demand, high pressure switch open	Dirty filter, dirty blower wheel, etc.

For more help with Ducane furnace troubleshooting codes, give the experts at ProSolutions a call. 780-453-6640.

Error Codes for RunTru Furnaces

Due to their dependability and reasonable price point, RunTru furnaces (built by Trane) are another popular choice for Edmonton homeowners.

If you have a RunTru furnace in your home, it’s important to note that RunTru error codes, unlike many other furnace brands, are not conveyed with coloured or flashing lights. Instead, RunTru furnaces use alpha-numeric codes to convey issues.

Below are some of the most common RunTru furnace error codes and what they mean.

Please Note: Refer to your furnace’s user manual for the most accurate and brand-specific error code details.

RunTru Furnace Error Code	Meaning	Potential Issue
E01	Loss of the IRQ or other internal failure	Issue with the control board. The control board may need to be reset or replaced.
E2.1	Retries exceeded (ignition error)	Gas valve issue, gas supply interruption, faulty igniter, or flame sensor problem (e.g., faulty or dirty sensor).
E2.2	Recycles exceeded (flame sensed and lost, one hour lockout after 10 times)	Dirty or broken flame sensor, inconsistent gas flow, faulty wiring, etc.
E3.1	Shorted pressure switch	Faulty pressure switch or wiring, venting problems/blockage in vent, etc.
E3.2	Open pressure switch	Damaged or faulty pressure switch, cracked pressure switch hose, pressure switch hose blocked or improperly connected, loose wiring, etc.
E04	Open thermal limit, rollout switch, or reverse airflow switch	Dirty/clogged filters, cracked or blocked heat exchanger, blocked vents, etc.
E05	Flame detected when no flame should be present	Gas valve malfunction, dirty or defective flame sensor, slow closure, electrical fault, gas valve stuck open or closing too slowly, etc.
E6.1	Voltage reversed polarity	Wiring issue.
E6.2	Bad grounding	Issue with wiring.
E6.3	(1) Igniter relay fails, or (2) igniter open	Faulty igniter or flame sensor, dirty filter, issue with gas line, etc.
E7.1	Gas valve (MVL) energized when it should be off	Gas valve stuck open, dirty or damaged flame sensor, issues with wiring, etc.
E08	Low flame current (still strong enough to allow operation)	Dirty or faulty flame sensor, low gas pressure, etc.
E09	Open inducer limit switch or condensate pressure switch	Blocked condensate drain or vents, issue with pressure switch, etc.
E12	Open fuse	Low airflow, issue with wiring, other faulty or worn furnace components.

Don’t let furnace issues disrupt your comfort! If you’re experiencing any of these RunTru furnace error codes, the certified technicians at ProSolutions Inc. can help. Our experts provide fast and reliable service throughout Edmonton and surrounding areas. Call us at 780-453-6640 to schedule a repair.

AirEase Furnace Error Codes

AirEase (by Lennox) is another highly recommended HVAC brand, thanks to its extreme reliability.

AirEase furnaces have advanced diagnostic systems that display error codes (using a 7-segment LED display) to help identify and troubleshoot issues. Understanding these codes can help homeowners diagnose problems and determine when to seek professional assistance.

Below is a table summarizing common AirEase furnace error codes, meanings, and potential issues.

Please Note: Always refer to your furnace’s user manual for the most accurate and brand-specific error code information.

AirEase Diagnostic Code	Meaning	Potential Issue
E105	Device communication problem	Problems with wiring, high voltage source of noise close to the system, etc.
E110	Low line voltage	Issues with wiring, control board, etc.
E113	High line voltage	Power supply not within proper range, etc.
E200	Hard lockout – open rollout circuit	Blocked airflow, cracked heat exchanger, low gas pressure, etc.
E223	Low pressure switch failed open	Blocked vents, faulty pressure switch, etc.
E224	Low pressure switch failed closed	Obstructed or defective vents or combustion air inducer, damaged or malfunctioning pressure switch, etc.
E240	Low flame current (run mode)	Dirty or damaged flame sensor, improper grounding, etc.
E250	Limit switch circuit open	Restricted airflow (e.g., clogged air filter, ductwork, etc.), component failure, etc.
E270	Soft lockout – exceeded maximum retries. No flame current sensed	Issue with gas flow, igniter, flame sensor, etc.
E275	Soft lockout – flame sensed out of sequence.	Gas valve leak, faulty sensor, etc.
E295	Indoor blower motor temperature too high	Poor airflow, issue with motor bearings or amps, etc.

If your AirEase system is displaying any of the furnace error codes above, please contact a professional HVAC company to accurately diagnose and resolve the issue.

Need help now? The certified technicians at ProSolutions Inc. can handle AirEase furnace problems quickly and efficiently. Contact us at 780-453-6640.

Ameristar Furnace Error Codes

Ameristar is another top HVAC brand recommendation for Edmonton homeowners. Ameristar furnaces (built by American Standard Heating and Air Conditioning) are efficient and built to last.

Similar to other top furnace brands like RunTru and AirEase, Ameristar furnaces are equipped with integrated diagnostic systems that display alpha-numeric error codes.

Below is a list of common Ameristar furnace error codes, what they mean, and potential causes.

Please Note: Error codes (and their meanings) can vary between different models. Always consult the documentation specific to your furnace model for accurate information.

Ameristar Error Code	Meaning	Potential Issue
E01	Loss of IRQ or other internal failures	Control board issue.
E2.1	Retry exceeded (failed to est flame)	Issue with gas valve, gas supply, flame sensor, igniter, etc.
E2.2	Recycles exceeded (established Flame lost) or PS open	Faulty wiring, dirty or damaged flame sensor, inconsistent gas flow, etc.
E2.3	Gas valve not energized when it should be	Worn or damaged gas valve, gas valve switched OFF, wiring issue, etc.
E3.4	Open pressure switch	Blocked airflow, broken pressure switch, issue with pressure switch hose, etc.
E04	Open thermal limit, rollout switch, or reverse airflow switch	Clogged filters, blocked vents, cracked or blocked heat exchanger, etc.
E05	Flame detected when it should not be present	Dirty, damaged or defective flame sensor, gas valve malfunction, electrical issue, etc.
E6.1	Voltage reversed polarity	Issue with line voltage polarity or wiring.
E6.3	(1) Igniter relay fails, or (2) igniter open	Defective flame sensor, bad igniter, dirty filters, gas line issue, etc.
E7.1	Gas valve (MVL) energized when it should be off	Gas valve stuck open, damaged or dirty flame sensor, wiring issue, etc.
E08	Flame current low (still strong enough for operation)	Dirty, damaged or faulty flame sensor, low gas pressure, etc.
E09	Open inducer limit switch or condensate pressure switch	Blocked condensate drain, blocked vents, faulty pressure switch, etc.
E12	Open fuse	Warn, dirty or faulty furnace components, low airflow, wiring issue, other.

Have a problem with your Ameristar furnace? Contact the furnace error code experts at ProSolutions Inc. Our experienced technicians will troubleshoot and fix the issue to ensure your family is safe and comfortable.

Need Help with Your Furnace? Consult Our Edmonton Furnace Repair Experts

ProSolutions PHAC technician fixing furnace error codes

Many furnace problems will require the help of a trained professional – especially when it comes to electrical or gas issues. Without regular maintenance, rust and corrosion resulting from dust, moisture, and heat can weaken the metal of your heat exchangers, leading to dangerous cracks. In some cases, if an issue is not correctly solved, it can be extremely dangerous. For example, if your heat exchanger is cracked. Therefore, if you aren’t a trained professional, it’s recommended that you consult a furnace repair expert to address furnace troubleshooting codes.

*Keep in mind, regular furnace maintenance and tune-ups can help minimize the need for repairs.

For all your furnace needs, ProSolutions is here to help. Feel free to consult our furnace repair experts at any time. And don’t forget to check out our furnace maintenance coupons for savings on our heating services.

Table of Contents

Primary Item (H2)