Coleman Evcon DGAT075BDD furnace Parts

For a Coleman Evcon furnace model DGAT075BDD, the furnace age is encoded in the serial number on the rating plate; once you match the serial format to the correct decoder, you can identify the manufacture month and year and calculate the unit’s age. Use the DGAT075BDD installation guide as a starting point for locating service panels and labels.

On most furnaces, the serial number is printed on the rating plate or a manufacturer label. Common places to check:

• Inside the burner compartment behind the front access door
• On the inside face of the upper or lower door panel
• Near the gas valve area or burner inlet area
• On the blower compartment panel
• Occasionally on the side panel of the cabinet

Coleman Evcon serial formats vary by production era, but most decoders use one of these patterns:

• Month and year embedded early in the serial (often the first 4 digits)
• Week and year format (for example, YYWW or WWYY)
• Letter-coded month plus a digit-coded year

• Write down the entire serial number exactly as shown (include letters).
• Note the model number DGAT075BDD from the same label.
• Look for a 2-digit year or a 4-digit date block within the serial.
• If you see a week number (01-52), pair it with the year to estimate the build date.

If the serial decodes to April 2014, then as of February 2026 the furnace is about 11 years and 10 months old.

Knowing the manufacture date helps us choose the right repair approach and parts strategy for your Coleman Evcon furnace, especially for age-related issues like ignition problems, blower wear, or heat exchanger inspection steps referenced in the DGAT075BDD installation guide.

If you need to look up parts by model after you confirm the serial format, search by DGAT075BDD on Sears PartsDirect.

Last updated: February 2026

A 60,000 BTU furnace typically heats about 1,200 to 2,000 sq. ft. In the Coleman Evcon DGAT075BDD, the installation specs list about 61,000 BTU/hr output for the DGAT075 series, so real coverage still depends on your climate, insulation, ductwork, and ceiling height; see the installation guide for model specs.

We size furnaces by the home’s heat loss, not just square footage. These factors move the number up or down:

• Climate zone (cold regions need more BTU per sq. ft.)
• Insulation and air sealing (attic, walls, rim joists, weatherstripping)
• Windows and doors (age, glazing, drafts)
• Ceiling height (taller ceilings increase volume to heat)
• Duct condition (leaks, poor airflow, high static pressure)
• Furnace output vs. input (output is what actually heats the home)

Use this as a practical planning range for a furnace around 60,000 BTU/hr output.

Oversizing can cause short cycling, uneven temperatures, and higher wear on parts like the igniter, gas valve, and blower. Undersizing can mean long run times and rooms that never reach set temperature.

For the most accurate answer, we recommend a Manual J heat-loss calculation (or an equivalent load calculation). If you are comparing furnaces, focus on BTU output and confirm airflow and duct static pressure are within spec for your setup.

If you need help finding the correct parts list for your exact furnace configuration, search by model number on Sears PartsDirect.

Last updated: February 2026

If your Coleman Evcon furnace model DGAT075BDD is running but not heating, the blower is moving air but the burners are not igniting or not staying lit. The most common causes are thermostat or power issues, restricted airflow (filter or ducts), or an ignition or flame-sensing problem.

• Confirm the thermostat is set to Heat and the setpoint is above room temperature.
• Make sure the furnace power switch is ON and the breaker is not tripped.
• Replace a dirty air filter and open all supply registers.
• Verify the manual gas shut-off valve is fully open.
• Watch a heat call cycle: inducer starts, igniter glows/sparks, burners light, then blower starts.

Your installation guide includes steps that directly relate to “runs but no heat” situations:

• Combustion air and venting: Remove bird screens or other obstructions at the combustion air inlet; a blocked inlet can prevent proper ignition and safe operation.
• Ignition and flame proving circuit: The guide references disconnecting wires to the gas valve, igniter, and flame sensor during service; loose or damaged wiring at these components commonly causes no-heat symptoms.
• Temperature rise check (ATR): After at least 5 minutes of operation, measure return vs. supply temperature to confirm the furnace is firing correctly and operating within the rating-plate range. Use the installation guide for the measurement locations and process.

A furnace that moves air without stable burner operation can indicate a safety shutdown (flame not proven, overheating, or venting/combustion air problems). Fixing airflow and ignition issues restores heat and helps prevent repeated cycling and component wear.

If you need to identify components (igniter, flame sensor, gas valve, pressure switch tubing) for your DGAT075BDD, start with the diagrams and parts list for this model, or search by model number on Sears PartsDirect.

Last updated: February 2026

To hard reset a Coleman Evcon furnace model DGAT075BDD, we cycle power to fully reboot the control board: turn the thermostat to OFF, shut off power at the furnace switch or breaker for a few minutes, then restore power and call for heat. Use the installation guide for model-specific shutdown steps.

• Set the thermostat to OFF.
• Turn the furnace power switch to OFF (many furnaces have a service switch near the unit).
• Turn the furnace circuit breaker OFF as well.
• Wait 3 to 5 minutes (this clears many lockouts and reboots the control).
• Turn the breaker ON, then the furnace switch ON.
• Set the thermostat to HEAT and raise the setpoint 3 to 5 degrees to start a heat call.

• Replace or clean the air filter; restricted airflow can overheat the furnace and trip safety limits.
• Confirm the thermostat has power and is set to HEAT.
• Make sure supply registers and return grilles are open and not blocked.
• If you recently had work done, verify the furnace doors/panels are fully seated (many units have a door switch).

Some furnaces include a manual reset on a rollout switch or limit switch. If you find a small button on a safety switch:

• Press it once after the furnace has cooled.
• If it trips again, stop resetting and correct the cause (airflow restriction, venting issue, burner problem).

Use this table to decide the next step after a hard reset:

A hard reset clears many temporary control-board lockouts, but repeated trips point to a safety condition (overheating, ignition failure, or gas supply problems). Fixing the root cause protects the heat exchanger, gas valve, and ignition system.

To look up diagrams and replacement parts by model number, search DGAT075BDD on Sears PartsDirect.

Last updated: February 2026

On a Coleman Evcon furnace like model DGAT075BDD, the most common failures we see are the flame sensor, igniter (hot surface or spark), and airflow-related safeties that trip because of a dirty air filter. These issues commonly prevent ignition or cause short cycling.

• Air filter (maintenance item): Restricted airflow leads to overheating and a limit switch trip.
• Flame sensor: Gets coated and stops proving flame; the control shuts the gas valve.
• Igniter: Cracks or weakens; burners never light.
• Pressure switch: Opens when venting or combustion air is restricted.
• Limit switch or rollout switch: Opens on overheating or flame rollout conditions.
• Thermostat or low-voltage wiring: No steady call for heat.

• Replace the air filter and confirm supply and return registers are open.
• Verify thermostat is set to HEAT and set above room temperature.
• Confirm the furnace power switch is on and the breaker is not tripped.
• Make sure the blower door/panel is fully seated (many furnaces have a door safety switch).
• If burners light then shut off within seconds, clean the flame sensor.

Misdiagnosing a simple airflow or flame-sensing problem can lead to unnecessary parts replacement and repeated safety shutdowns. The installation guide for DGAT075BDD includes shutdown steps and checkout items (such as venting and temperature rise checks) that help confirm safe operation after service.

For parts lookup by model number, use the DGAT075BDD parts list or search by model on Sears PartsDirect.

Last updated: February 2026