Restore consistent heat from your Coleman DGAA070BDTB with genuine OEM replacement parts from Repair Clinic. This 70,000 BTU (070) furnace is the BDTB revision of Coleman’s DGAA series, a Coleman Evcon line supported by Johnson Controls with York and Luxaire. The parts most often replaced are the limit switch, the blower motor, the DGAA070BDTB igniter, and the flame sensor. Confirm each part on the DGAA070BDTB parts list, then browse every Coleman furnace part we carry.
How the DGAA070BDTB Manages Airflow and Safety
On this DGAA070BDTB furnace, airflow and safety are tightly linked. The blower must move enough air across the DGAA070BDTB heat exchanger to keep it below the limit switch setting; when airflow drops, the limit opens, the burner shuts off, and the furnace cycles on and off without satisfying the thermostat. That makes filters, return grilles, and blower performance the first things to check. The BDTB suffix is a later revision of the DGAA070BDTA; ignition parts are largely shared, while boards can differ. The DGAA070BDTB manual and DGAA070BDTB diagram document the sequence, limit locations, and fault codes. For guided DGAA070BDTB repair steps, visit the model troubleshooting page.
Most Replaced DGAA070BDTB Furnace Parts
Limit Switch Trips and Airflow Restriction
Repeated limit trips are a symptom, not usually a failed switch. Replace the filter, open closed registers, and confirm the blower reaches full speed. If the furnace still trips with good airflow, or the switch reads open when cool, replace the limit switch.
Blower Motor and Run Capacitor
Weak or uneven airflow and a humming motor often start with a failed run capacitor. Test the capacitor first and replace it if it reads more than 5 to 10% below its rated microfarad value, matching the rating on the installed part. Replace the blower motor only if a good capacitor does not restore speed.
Control Board Timing Faults
The board controls inducer purge, ignition, flame proving, and blower delays. A failing board may run the DGAA070BDTB draft inducer motor out of sequence or leave the blower running after the heat call ends. Read the code and test the related parts first, then order a board matched to the BDTB suffix from the control board filter.
Igniter and Flame Sensor
If the inducer runs and the switch closes but the burner never lights, the igniter has likely cracked. If the burner lights and then drops out, the DGAA070BDTB flame sensor needs cleaning or replacement. Both parts are in the igniter and flame sensor listings.
Why Choose Repair Clinic for Coleman DGAA070BDTB Furnace Parts
- OEM Coleman Components: Genuine parts from the Johnson Controls family that includes York and Luxaire. Shop all Coleman furnace parts.
- Revision-Aware Ordering: BDTB boards are matched to their suffix, while shared igniters and sensors fit both revisions.
- Airflow Before Limit Switch: Filter, registers, and capacitor are checked before any limit switch or motor is replaced.
- Order DGAA070BDTB Parts Online: In-stock DGAA070BDTB replacement parts and DGAA070BDTB parts ship the same day with a 365-day return policy.
Coleman DGAA070BDTB Furnace FAQ
Why does my furnace keep shutting off before the house warms up?
Restricted airflow is the most common cause. A dirty filter or weak blower lets the heat exchanger overheat, and the limit switch shuts off the burner. Fix the airflow before replacing the switch.
Why is airflow weak from my registers?
Check the filter first, then test the blower run capacitor. A capacitor reading well below its rated value slows the motor. Replace the motor only if a good capacitor does not help.
Is the DGAA070BDTB control board the same as the BDTA board?
Not always. Boards can change between revisions, so order the board listed for your model. Igniters and flame sensors are usually shared between the two.
Does a limit switch trip mean the heat exchanger is damaged?
Usually not. Most trips come from airflow problems. Repeated rollout or limit trips with good airflow, or visible scorching, call for a professional heat exchanger inspection.
