Why is my Coleman furnace not working?
If your Coleman Evcon gas furnace model BGU07512A is not working, the most common causes are a tripped breaker, the furnace service switch being off, a thermostat call for heat issue, or a safety lockout from overheating or ignition failure. Start with power, thermostat settings, and airflow checks.
Quick checks we recommend first
- Confirm the furnace breaker is ON (reset once if tripped).
- Make sure the furnace service switch near the unit is ON.
- Set the thermostat to HEAT and raise the setpoint 3 to 5 degrees.
- Replace the thermostat batteries (if your thermostat uses them).
- Check the furnace door/panel is fully seated; many furnaces will not run if the door switch is open.
- Replace a dirty air filter; restricted airflow can trip the high-limit and stop heat.
What to do if it starts, then shuts off
A furnace that runs briefly and stops is usually reacting to a safety condition.
- Overheating: A clogged filter, closed registers, or blocked return air can trip the limit switch.
- Flame/ignition issue: The igniter may not light the burners, or the flame sensor may not prove flame.
- Draft/venting issue: A blocked intake/exhaust or pressure switch problem can prevent ignition.
Typical symptoms and what they point to
| What you notice | What it usually means | What to check next |
|---|---|---|
| No lights, no blower, no sound | No power to furnace | Breaker, service switch, door switch |
| Blower runs but no heat | Heat not being enabled | Thermostat settings, ignition sequence |
| Starts then stops after a few minutes | Overheat or safety trip | Filter, vents, registers, return air |
| Repeated tries to start | Ignition/flame proving problem | Igniter, flame sensor, venting |
Why it matters
A non-running furnace can be as simple as a power or thermostat issue, but repeated shutdowns often indicate a safety trip. Fixing airflow problems (filter, registers, return) prevents overheating and helps protect the heat exchanger and controls.
Parts and help for model BGU07512A
We recommend using the model number BGU07512A to match the correct Coleman Evcon furnace parts and diagrams. You can also search by model on Sears PartsDirect if you are comparing options or building a parts list.
For electrical troubleshooting steps (like checking a fuse or testing voltage safely), our DIY guides can help: how to use a multimeter to test electrical parts video.
Last updated: February 2026
Can hear your furnace click on but it does not fire up?
If your Coleman Evcon gas furnace model BGU07512A clicks but does not fire, the control is trying to start ignition but the burners are not lighting. The most common causes are a dirty flame sensor, ignition failure, a pressure switch or venting issue, or a gas supply problem.
What to check first (safe homeowner steps)
- Set the thermostat to HEAT and raise the setpoint 3 to 5 degrees.
- Replace or charge thermostat batteries (if your thermostat uses them).
- Check the furnace power switch and the circuit breaker.
- Replace a dirty air filter; restricted airflow can trigger safety lockouts.
- Make sure all supply registers are open and return grilles are not blocked.
- If the furnace has a door interlock switch, confirm the panel is fully seated.
What the clicking usually means
In many BGU-series furnaces, a “click” is the control board energizing a relay (often for the inducer, igniter, or gas valve). If ignition does not complete, the furnace may retry several times and then lock out.
Common symptom-to-cause guide
| What you notice | What it often points to | What we recommend |
|---|---|---|
| Clicks, inducer runs, no flame | Igniter not heating or not sparking | Technician tests igniter and control output |
| Flame lights briefly then shuts off | Dirty flame sensor or poor grounding | Clean sensor, verify flame signal |
| Inducer starts then stops, no ignition | Pressure switch not proving draft | Check venting, condensate (if applicable), switch tubing |
| No inducer, just a click | Control, door switch, or power issue | Verify 120V power and safety switches |
Why it matters
A furnace that clicks but will not fire is usually being stopped by a safety circuit. Forcing repeated restarts can worsen the problem (overheating, lockouts) and delays heat when you need it.
When to stop and schedule service
- You smell gas or suspect a gas supply issue.
- The furnace repeatedly tries to light and fails.
- You see soot, scorching, or melted wiring.
For model-specific replacement parts and diagrams for BGU07512A, use the parts list for this model, or search by model number on Sears PartsDirect. For electrical checks, our guide how to use a multimeter to test electrical parts video helps you test safely and accurately.
Last updated: February 2026
Why is the red light blinking on my EVCON furnace?
On the Coleman EVCON BGU07512A gas furnace, a blinking red status light is the control board reporting a fault. The most common causes are ignition or flame-sensing problems (burners do not light, or they light briefly and shut off). Use the flash pattern and the furnace’s behavior to narrow the cause.
Read the blink pattern first
Count the flashes between pauses and note what the furnace does during a heat call.
- Number of flashes before the pause
- Whether the inducer motor starts
- Whether the ignitor glows
- Whether flame appears, then drops out
- Whether the blower runs continuously
Common causes and what to check
These are the most frequent reasons we see for a blinking red light on EVCON-style gas furnaces.
- Dirty flame sensor: Clean the sensor rod gently with a fine abrasive pad; reinstall firmly.
- Weak or cracked hot surface ignitor: Look for hairline cracks or a chalky, worn surface.
- Gas supply issue: Verify the manual shutoff is fully open; confirm other gas appliances work.
- Pressure switch or venting problem: Check intake/exhaust terminations for blockage; listen for inducer operation.
- Overheat/limit trip: Replace a clogged filter, open registers, clear return-air restrictions.
What the behavior usually means
| What you observe | What it points to | Next step |
|---|---|---|
| Ignitor glows, no flame | Gas not reaching burners | Check shutoff valve, gas supply |
| Flame lights then shuts off | Flame not proven | Clean flame sensor, check grounding |
| Inducer never starts | Draft/pressure switch path | Check venting, inducer power |
Why it matters
Repeated ignition retries can lead to nuisance lockouts and extra wear on the ignitor and control components. Correcting the root cause restores steady heat and more reliable cycling.
To look up parts by model and shop replacements, search BGU07512A on Sears PartsDirect.
Last updated: February 2026
Where is the limit switch on a Coleman furnace?
On a Coleman Evcon gas furnace like model BGU07512A, the high-limit switch is typically mounted on the furnace’s warm-air (supply) side so it can sense overheating. You usually reach it by removing the front access panel and looking for a small disc-style or rectangular switch with two wires attached.
Where to look first (most common spots)
After shutting off power to the furnace, check these areas inside the cabinet:
- On the sheet-metal partition between the burner/heat exchanger area and the blower compartment
- On the hot-air outlet area just above the heat exchanger section
- Near the supply-air opening where the ductwork (supply plenum) connects
- Close to the blower housing area, mounted to a flat panel in the airflow path
- In a cluster with other safety switches (limit and rollout switches are often in the same general area)
Limit switch vs. other furnace safety switches
Use the location and wiring to avoid mixing up parts.
| Switch | Typical identifier | Typical location | What it does |
|---|---|---|---|
| High-limit switch | 2 wires; mounted in airflow | Warm-air side near heat exchanger or supply outlet | Shuts burners off if furnace overheats |
| Flame rollout switch | Often has a small reset button | Near burners/vestibule | Trips if flame rolls out of burner area |
| Pressure switch | Has a rubber hose | Near inducer motor | Proves draft/venting before ignition |
How to confirm you found the high-limit switch
- Turn off electrical power at the furnace switch or breaker
- Remove the upper/front access panel
- Look for a switch mounted to metal with two push-on wire terminals
- If you test it, check continuity when the furnace is cool
- If it is open when cool, correct the overheating cause before replacing the switch
For safe meter technique, use how to use a multimeter to test electrical parts video.
Why it matters
When the high-limit opens, the burners shut off to protect the heat exchanger. The most common trigger is restricted airflow (dirty filter, blocked return, closed registers, or a blower problem).
If you need to order parts for BGU07512A, start with the model-based parts list, or search by model on Sears PartsDirect.
Last updated: February 2026
