Please note, the following Coleman Repair guide is for informational purposes only. Any servicing you attempt is at your own risk.
➤ A complete Coleman furnace repair guide, from how to replace your air filter, to troubleshooting and error codes, model numbers and more!
Coleman, At a Glance
Founded in 1923 by W.C. Coleman, the Coleman® Company has since become a leading manufacturer of heating and cooling products. This comprehensive Coleman furnace repair guide will help your troubleshoot any common issues that your furnace might experience.
Coleman Furnace Repair Guide
Common Coleman Furnace Problems and Troubleshooting
Before attempting any sort of repair, remember to shut off the power to your Coleman furnace completely.
| Is your furnace... | The problem might be your... | What's wrong? | How you can fix it: |
|---|---|---|---|
| Not heating? | Circuit Breaker/Fuse | Most likely, either the electrical system providing your furnace’s power has shorted or the power switch has blown. | Try resetting your furnace’s circuit breaker. If it has blown, you will need to replace it. |
| Igniter | The furnace’s igniter might either be cracked or faulty. | Check the part for cracks, if it is then replace the igniter. If it isn’t cracked, use a multimeter to test for continuity. | |
| Cycling irregularly? | Thermostat | Your thermostat might be adjusting incorrectly, causing the furnace to cycle on and off too often. | If your thermostat has an adjustable calibration scale, adjust the heat anticipator. If this does not stabilize the unit, you may have to replace the thermostat. |
| Not blowing hot air? | Blower Motor | Your blower motor may have completely burnt out. If this doesn’t seem to be the case, then the connecting belt may have simply broken. | Test to see if power is reaching the motor. If it does, but isn’t running, the motor has likely failed. If the motor runs but air doesn’t move, the connecting belt has probably broken. You’ll have to replace the belt. |
| Blowing too much air? | Control Board | The control board regulates the amount of voltage that reaches each functioning part. If the relay that controls the blower motor has failed, it will continually send voltage to the motor. | Replace the control board. |
| Thermostat | The contact that controls the blower motor on your thermostat may be stuck closed, causing the blower motor to run continuously. | Use a multimeter to check for continuity. If it appears the thermostat is the issue, replace it. | |
| Leaking water? | Drain Pipe | ||
| Starting and then stopping shortly after? | Flame Sensor | Your furnace’s flame sensor monitors the burner, detecting whether a flame is present. If it is either defective or dirty, it will not be able to detect a flame. | If dirty, clean the sensor using a fine abrasive pad. If faulty, replace the flame sensor. |
An important tip to remember is to properly maintain the internal components of your furnace. One easy way to do this is to regularly replace your air filter. This ensures that vital components can function at their best for long-term success.
How to Replace Your Air Filter
- Remove the access panel to your Coleman furnace
- Locate the air filter, it’s found in a slot near either the side or bottom of return air duct
- Remove the used air filter
- Insert the new air filter, ensure that the indicators are pointing in the correct direction
- Return the access panel to where it was
Read more: How to Change a Dirty Furnace Filter – A Guide for Homeowners
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Coleman Furnace Error Codes
| Error Codes | What this means | How to fix it |
|---|---|---|
| Slow green flashing | Coleman furnace is operating normally. | N/A |
| Slow amber flashing | Normal operation with a call for heat. | N/A |
| Steady on red | There's a control failure. | Check control unit. |
| Rapid red flashing | There's a twinning error with incorrect 24V phasing. | Check the twinning wiring. |
| Rapid amber flashing | There's a low flame sense current. | Check and clean the flame sensor. If it's still an issue, check for proper gas flow. |
| One red flash | A flame's present with the gas turned off. | Check the gas valve. It could be leaky or slow closing. |
| Two red flashes | Pressure switch is stuck in the closed position. | Check if there is a faulty pressure switch or miswiring. |
| Three red flashes | Pressure switch is stuck in the open position. | Check if there is a faulty inducer, a blocked vent pipe, a broken pressure switch hose, or a faulty pressure switch. |
| Four red flashes | Limit switch is stuck while open. | Check for a a dirty filter, an improperly sized duct system, an incorrect blower speed setting, or a faulty blower motor. |
| Five red flashes | Rollout switch is stuck while open. | The rollout control is manually reset. Therefore, if it has opened, then check to see if the inducer is operating properly or there is an issue with the primary heat exchanger. |
| Six red flashes | Pressure switch cycle has locked out. | The furnace will lockout for one hour and then reset. |
| Seven red flashes | There's an ignition lockout due to too many retries. | The flame couldn't be established, check for a faulty gas valve, a dirty or defective flame sensor, a faulty hot surface ignitor, or a problem with the burner. |
| Eight red flashes | There's an ignition lockout due to repeated power recycles. | Check if there is low gas pressure, a dirty or defective flame sensor, or a faulty gas valve. |
| Nine red flashes | There's a grounding or line polarity issue. | Check the polarity at both the furnace and branch. |
| Ten red flashes | Gas continues to flow with no call for heating. | Check on the gas valve and the gas valve wiring. |
When to call a professional to repair your Coleman furnace
Although this comprehensive Coleman repair guide can help you troubleshoot the most common issues that your unit may experience, it’s always a good idea to contact a certified HVAC technician for complex problems. If your furnace stops producing an adequate amount of heat or begins to leak or drip, you should contact a trained professional immediately. These issues typically occur when there’s a broken internal component.
Who Should You Call?
It might be difficult at first to know who to call when your Coleman furnace starts to perform sub-optimally. Online consumer reviews are a great place to start. From these, you can learn about local HVAC contractors, the types of services they perform, as well as their potential prices. However, it’s important to remember that you can’t trust these reviews completely due to anonymity and biases.
So how can you guarantee that you’re getting trustworthy information? We can help! Our independent certification program connects Canadian homeowners with certified heating and cooling professionals in their area. The companies that we refer have met many criteria to ensure that your Coleman furnace receives the attention it deserves.
Coleman’s Warranty Coverage
Depending on the tier of Coleman furnace that you bought, the brand offers a range of warranty coverages to protect your investment best.
- A limited lifetime heat exchanger warranty covers all Echelon™ Series furnaces, a limited 10-year Completed Assurance™ warranty pledge, a limited 10-year parts protection warranty, as well as a limited 90-day labour warranty.
- The mid-range LX Series units include a limited lifetime heat exchanger warranty, a limited 5-year Complete Assurance™ warranty pledge, a limited 10-year parts protection warranty, as well as a limited 90-day labour warranty.
- Entry-level Comforteer™ models offer a limited lifetime heat exchanger warranty, a limited -year parts protection warranty, as well as a limited 90-day labour warranty.
Protect your Coleman furnace: Register and access your Coleman furnace warranty here
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