Restore reliable heat from your Coleman DGAA077BDTB with genuine OEM replacement parts from Repair Clinic. The 077 code identifies a 77,000 BTU input, the largest common size in Coleman’s DGAA gas furnace series, a Coleman Evcon line supported by Johnson Controls alongside York and Luxaire. The parts replaced most often are the DGAA077BDTB igniter, the control board, the draft inducer motor, and the flame sensor. Check your build on the DGAA077BDTB parts list, then browse every Coleman furnace part we carry.
DGAA077BDTB Details and Compatibility
This DGAA077BDTB furnace is the BDTB revision of the 77,000 BTU DGAA; the DGAA077BDTA is the earlier revision of the same size. Most ignition and sensing parts carry across both, but control boards and pressure switches can differ between runs, so confirm those against your exact suffix. The larger input means the DGAA077BDTB heat exchanger depends heavily on full blower airflow, and a loaded filter trips the limit quickly. The DGAA077BDTB manual and DGAA077BDTB diagram on the diagrams tab cover wiring and LED fault codes. For DGAA077BDTB repair steps, open the model troubleshooting guide.
Must-Have Replacement Parts for This Coleman Furnace
Igniter and Failed Startups
If the inducer runs and the pressure switch closes but no flame appears, inspect the hot surface igniter first. A cracked element stops reaching ignition temperature, and repeated failed starts stress the gas valve and board. Replace the igniter and handle it only by its base.
Control Board Sequencing
The board coordinates inducer purge, igniter timing, gas valve control, flame proving, and blower delays. Because it governs so much, test the igniter, flame sensor, and pressure switch before ordering one. Match the replacement to the BDTB suffix from the control board filter.
Draft Inducer Motor and Pressure Switch
The DGAA077BDTB draft inducer motor creates the negative pressure the switch monitors. A slow motor causes pressure faults even when the switch is fine. Check the tubing for cracks or moisture, confirm motor speed, and then replace the inducer motor or pressure switch as the tests indicate.
Flame Sensor and Short Cycling
Oxidation on the DGAA077BDTB flame sensor lowers its signal, so the gas valve closes within seconds of lighting. Clean the rod with fine steel wool, and replace the flame sensor if short cycling continues.
Why Choose Repair Clinic for Coleman DGAA077BDTB Parts
- Genuine Coleman and Johnson Controls Parts: OEM components shared with York and Luxaire equipment. Browse all Coleman furnace parts.
- Revision Matching: BDTB and BDTA boards and pressure switches are listed separately; shared ignition parts are flagged.
- Test Before Board: Igniter, flame sensor, and pressure circuit are checked before any control board is ordered.
- Shop DGAA077BDTB Parts Online: In-stock DGAA077BDTB replacement parts and DGAA077BDTB furnace parts ship the same day with a 365-day return policy.
DGAA077BDTB Furnace Parts FAQ
Which DGAA077BDTB parts are replaced most often?
The igniter, control board, draft inducer motor, and flame sensor. Regular filter changes reduce stress on all of them, especially at this larger 77,000 BTU input.
Why does my furnace start and then shut off?
Usually a dirty flame sensor, a pressure fault from cracked tubing or a slow inducer, or a limit trip from restricted airflow. Clean the flame sensor first.
Are DGAA077BDTA parts compatible with the DGAA077BDTB?
Most ignition and sensing parts are shared. Control boards and pressure switches can change between revisions, so match those to your exact suffix.
How often should the air filter be replaced?
Every one to three months, more often in heavy heating seasons or homes with pets. A clogged filter is a leading cause of limit trips and inducer stress.
