Coleman Evcon DGAT095ADC furnace Parts

On the Coleman DGAT095ADC Evcon furnace, the limit switch is typically mounted inside the burner and heat exchanger area, most often on the hot-air plenum or on the partition near the heat exchanger where it can sense overheating. You’ll usually spot it by following two wires from the control board to a small disc or rectangular switch.

Common locations to check first

On most Coleman gas furnaces, the high-limit (temperature) switch is placed where supply air temperature rises fastest.

• On the hot-air plenum just above the burners (inside the cabinet)
• On or near the heat exchanger panel or heat exchanger vestibule
• On the blower shelf or divider panel between the burner section and blower section
• Near the flue/vent outlet area (some models also have auxiliary limits)
• In-line with a rollout or auxiliary limit circuit (often near the burner box)

What it looks like (so you know you found it)

Limit switches vary by style, but they share a few identifiers.

What you see	What it usually means
Small round disc with 2 terminals	Common high-limit switch style
Small rectangular switch with 2 terminals	Alternate high-limit style
Manual-reset button (often red)	Manual-reset limit or rollout type (do not keep resetting)

Safe, practical way to identify it

We recommend using a simple trace-and-confirm approach.

• Turn off electrical power to the furnace at the breaker before opening panels
• Remove the burner compartment door and look for the burner box and heat exchanger area
• Locate the furnace control board and look for two wires labeled for limit/aux limit (labeling varies)
• Follow those wires to the switch mounted on sheet metal near the heat source
• If you need to test it, use a meter to check continuity with power off

For help using a meter correctly, use our how to use a multimeter to test electrical parts video.

Why it matters

The limit switch is a primary safety control; it shuts the burners off if the furnace overheats. If it trips repeatedly, the usual causes are restricted airflow (dirty filter, blocked return, closed registers), a failing blower motor/capacitor, or a dirty evaporator coil.

Last updated: February 2026

A blinking green light on your Coleman Evcon furnace model DGAT095ADC is a diagnostic signal from the control board. The furnace is reporting a fault or a failed ignition cycle, and the exact cause depends on the blink pattern (the number of flashes between pauses).

What the blink pattern usually means

Most Coleman-style furnace control boards use flash codes to point you to a system that is not proving safe operation. Common causes include:

• Ignition retries exceeded (the furnace tried to light several times and locked out)
• Pressure switch not closing (draft inducer or venting issue)
• Flame not sensed (dirty flame sensor, weak flame, or gas supply issue)
• Limit switch open (overheating from restricted airflow)
• Rollout switch open (burner or venting problem)

Quick checks you can do safely

Turn off power to the furnace at the switch or breaker before opening panels.

• Check the air filter; replace if dirty or collapsed
• Make sure supply registers and return grilles are open and not blocked
• Confirm the thermostat is calling for heat and has fresh batteries (if applicable)
• Look for a blocked intake/exhaust (snow, leaves, nests, sagging vent pipe)
• If the furnace has a sight glass, watch the start-up sequence (inducer, igniter, flame)

How to use the light to narrow it down

Use this simple approach to capture the code accurately:

What to do	What to look for	Why it matters
Watch the LED for 60 seconds	Count flashes between longer pauses	The count is the “code”
Note when it happens	Start-up, after flame, or mid-heat	Points to ignition, flame sense, or overheating
Check for lockout reset	Power cycle once (off 60 seconds, then on)	Confirms whether it is a temporary lockout

Why it matters

That blinking green light is the furnace telling you it is not proving safe heat. Ignoring it can lead to repeated lockouts, no-heat calls, and overheating or venting-related shutdowns.

For deeper electrical troubleshooting (like checking a pressure switch circuit or limit switch continuity), use a meter and follow safe testing practices in our how to use a multimeter to test electrical parts video.

Last updated: February 2026

If your Coleman Evcon furnace model DGAT095ADC runs the blower but will not ignite, the most common causes are a thermostat call issue, a gas supply interruption, a dirty flame sensor, a failed hot surface igniter, or a safety switch/board lockout stopping the gas valve from opening.

Quick checks we recommend first (safe, no disassembly)

• Confirm the thermostat is set to HEAT and the setpoint is above room temperature.
• Replace the thermostat batteries (if your thermostat uses them).
• Check the furnace power switch and the circuit breaker.
• Make sure the gas shutoff valve to the furnace is fully open.
• If you have other gas appliances, verify they are working (helps confirm gas supply).

What to look for during an ignition attempt

Watch one full heat cycle and note where it stops. This narrows the failure fast.

What you see/hear	What it usually means	Common next step
Inducer motor never starts	No call for heat, no power, or control issue	Verify thermostat and power
Inducer runs, then stops	Pressure switch not proving draft	Check venting and intake for blockage
Igniter never glows/sparks	Ignition component or control not sending power	Test igniter circuit with a meter
Igniter glows, no flame	Gas valve not opening or gas supply issue	Confirm gas valve open; check for lockout
Flame lights then drops out quickly	Flame sensor not proving flame	Clean flame sensor; check grounding

Common fixes for “runs but won’t ignite”

• Dirty flame sensor: Light oxidation can prevent flame proofing; cleaning often restores ignition.
• Failed igniter: Hot surface igniters can crack or go open and stop lighting.
• Pressure switch/venting issue: A blocked flue, intake, or condensate drain (on some systems) can prevent ignition.
• Control board lockout: After repeated failed tries, many furnaces pause ignition until power is reset.

Why it matters

When DGAT095ADC cannot prove draft or flame, the control shuts off gas for safety. Fixing the root cause (flame sensing, ignition, draft proving, or gas delivery) restores heat and prevents repeated lockouts.

Helpful DIY guidance

For electrical testing and safe troubleshooting steps, use our guides: how to use a multimeter to test electrical parts video and how to tell if a fuse is blown.

Last updated: February 2026

On a Coleman Evcon furnace like model DGAT095ADC, five flashes typically indicates an “open rollout switch” (flame rollout safety trip). This usually points to an unsafe heat or venting condition, so we recommend stopping the furnace and correcting the cause before resetting anything.

What “rollout switch open” means

The rollout switch is a safety limit that opens if it senses abnormal heat or flame movement outside the burner area. When it trips, the control board flashes a code (often 5 flashes) and shuts down heating to prevent damage.

Common causes to check first

Turn off power to the furnace at the switch or breaker before inspecting.

• Blocked flue or exhaust vent (snow, nests, collapsed pipe, disconnected vent)
• Restricted combustion air intake (if your setup uses one)
• Dirty or plugged secondary heat exchanger (common on condensing furnaces)
• Failing inducer motor or inducer wheel issues (weak draft)
• Burner or heat exchanger airflow problems (dirty burners, improper flame)
• Loose wiring or a weak rollout switch (less common than a real venting issue)

Safe, practical next steps

If you are comfortable doing basic checks, start with airflow and venting.

1. Verify the thermostat is calling for heat.
2. Check the furnace filter and return air grilles; replace a clogged filter.
3. Inspect the vent pipe for blockage, sagging, or disconnection.
4. Look for signs of overheating (scorch marks, melted wire insulation, strong hot smell).
5. If the code returns after a reset attempt, stop and schedule service.

Quick guide: what you can do vs. what needs service

Check	DIY-friendly	Usually needs a technician
Replace air filter, open registers	Yes	No
Inspect vent termination for blockage	Yes	No
Test switches, inducer draft, combustion	No	Yes
Heat exchanger or secondary cleaning	No	Yes

Why it matters

A rollout switch trip is a safety event, not a nuisance code. Fixing the underlying venting, draft, or heat exchanger problem helps prevent repeated shutdowns and protects critical components like the control board, inducer, and burners.

For general repair safety and tool guidance before troubleshooting electrical components, use our are diy appliance repairs safe resource.

Last updated: February 2026

The most common “failure point” on a furnace is the air filter getting clogged and restricting airflow; that can overheat the furnace and trip safety controls so it shuts down. On a Coleman Evcon DGAT095ADC furnace, the next most common issues are ignition sensing and basic electrical power problems.

Most common furnace problems we see (and what they look like)

• Dirty air filter (restricted airflow): furnace starts, then shuts off; short cycling; high-limit trips
• Flame sensor issues: burners light briefly, then go out; repeats the ignition cycle
• Igniter problems (hot surface igniter): inducer runs but burners never light
• Thermostat or low-voltage wiring issues: no call for heat; intermittent operation
• Blown fuse or tripped breaker: furnace appears dead; no blower or control board lights
• Blocked condensate drain (high-efficiency units): shuts down on safety; water around furnace

Quick checks you can do first (before replacing parts)

1. Replace the air filter and make sure all supply and return vents are open.
2. Confirm thermostat settings (Heat mode, setpoint above room temp) and replace batteries if used.
3. Check power: furnace switch on, breaker on, and door panel seated (door switch engaged).
4. Look for a diagnostic light on the control board and count the flash pattern.
5. Inspect the flame sensor area for visible oxidation; cleaning is often the fix.

Common “symptom to likely culprit” map

Symptom	Most likely cause	Typical fix
Starts then stops after 1 to 5 minutes	Dirty filter, overheating, limit switch opening	Replace filter; check airflow
Burners light then shut off in seconds	Dirty flame sensor	Clean flame sensor
Inducer runs, no flame	Failed igniter, gas supply issue	Test igniter; verify gas is on
Completely dead	Blown fuse, tripped breaker, door switch	Restore power; replace fuse

Why it matters

Airflow and ignition safety circuits are designed to shut the furnace down to prevent overheating or unsafe combustion. Fixing the root cause (often a filter or sensor) prevents repeat shutdowns and protects expensive components like the control board and blower motor.

For safe electrical testing steps and tool basics, use our how to use a multimeter to test electrical parts video.

Last updated: February 2026