Ordering the wrong replacement part keeps your home cold for extra days. Coleman Evcon manufactures distinct gas and electric heating systems for mobile homes, and the internal components never cross over. A limit switch built for a gas model cannot fix an electric unit. Proper coleman evcon furnace troubleshooting starts with identifying your exact system.
This guide breaks down the most frequent Coleman mobile home furnace problems by model family so you can pinpoint the exact fault immediately.
The model number is on the data plate inside the front access panel. On Coleman units, the first letters tell you the model family:
DGAH056 vs DGAH077: not the same furnace. The 056 is the short model (56,000 BTU). The 077 is the full-height model (77,000 BTU). Parts are not interchangeable between them even though the model numbers look similar. Always confirm the complete model number, not just the prefix.
| Model Prefix | Type | Common Series |
|---|---|---|
| DGAH | Gas furnace standard height | DGAH056, DGAH077 |
| DGAT | Gas furnace down-flow configuration | DGAT056, DGAT077 |
| DGAA | Gas furnace (older/discontinued series) | Various |
| EB | Electric furnace | EB series, various kW ratings |
| 3110, 3400, 3500 | Electric furnace (older series) | Common in homes from 1980s–1990s |
| E series | Electric furnace | E3EB, E4EB, E7EB |
On Coleman gas furnaces, this is almost always the igniter not completing the firing sequence or the gas valve not opening. Both are part of the same diagnosis path. The fan switch failure can also cause the blower to run outside of a normal heating cycle, making it appear heat is missing when the furnace simply is not calling for it.
Check the thermostat is set to Heat and above room temperature before anything else. A suspect thermostat showing no display, unresponsive controls, or original factory wiring often needs replacement. Mobile home thermostats are HUD-compliant and readily stocked in both digital and mechanical options.
A coleman electric furnace in a mobile home heats using resistance heating elements controlled by sequencers. There is no gas valve, no igniter, no pilot light. The diagnosis path is different from gas furnace problems in every respect.
When a coleman mobile home furnace not working leaves you with zero heat, the most common electrical failure is a dead sequencer or a burned-out heating element. Sequencers are time-delay switches that stagger the heating elements on in sequence to prevent a circuit overload. When one fails, the elements it controls do not activate.
The Coleman 2 Stage Sequencer 3110-3571 fits the 3110 series electric furnace. Confirm your model number before ordering. Sequencer configurations vary by series and kW rating.
A Coleman electric furnace with multiple heating elements can have one element fail while others continue working. The result is the furnace runs, the blower distributes some heat, but output is noticeably below normal. This is different from a complete no-heat situation and points specifically to a failed element rather than a sequencer or control board fault.
A Coleman electric furnace utilizing multiple heating elements can experience a single element failure while the others continue operating. The furnace runs and the blower distributes heat, leaving the overall output noticeably below normal. This specific symptom points directly to a failed element rather than a sequencer or control board fault. Experiencing a complete no-heat situation requires testing entirely different components. Consult our comprehensive mobile home furnace diagnosis guide to track down those full system failures
Confirm your exact series before ordering and work through the airflow checklist first:
When the blower motor fails on a Coleman EB series electric furnace, the whole blower assembly typically needs replacing rather than just the motor, because the motor and wheel are matched units in these applications. The Coleman 4 Ton Blower Assembly for EB Series is a factory replacement with the motor, wheel, and wiring harness. For smaller units, the Coleman 1/3 HP Motor EB Series covers the motor-only replacement on units that use the 1468-243P spec.
Parts That Fit Older Coleman Models From the 1980s and 1990s
A significant portion of manufactured homes still running Coleman furnaces were built between 1980 and 1995. Parts for those models are not on hardware store shelves. Home Depot does not stock a limit switch for a 3400-series Coleman electric furnace. Amazon listings for these parts are frequently mismatched or non-specific.
Finding authentic coleman evcon parts for a manufactured home built in the 1980s or 1990s requires a specialized supplier. American Supply and Air Products has stocked these exact components since 1994
When the heating system requires a full replacement rather than a single component, we stock exact-fit Coleman Evcon gas furnaces ready for installation. The Coleman Gas Furnace DGAH056 is the short model (56,000 BTU), the correct replacement for manufactured homes with the shorter utility closet configuration. Replacing a DGAH077 requires confirming the cabinet height clearance before ordering the short model
HVAC parts and furnaces cannot be returned once received. Confirm your complete model number including the full suffix before ordering. DGAH056 and DGAH077 share a prefix but are different units with different parts. Full policy: returns and refunds policy.
Whether dealing with a gas or electric furnace, a brand-new model, or a thirty-year-old unit, read us the number so we can match the part exactly before you order.
Call 1-800-368-6208 | Mon-Fri 8am-5pm | Sat 9am-1pm
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HVAC parts and furnaces cannot be returned once received. Confirm your model number before ordering.
Coleman furnace clicking but not lighting :igniter and gas supply diagnosis: mobile home furnace clicks but won’t light.
Coleman furnace tripping the limit switch : airflow and limit switch diagnosis: mobile home furnace shuts off after a few minutes.
How to find and press the reset button on Coleman and Intertherm units: how to reset a mobile home furnace.
Full furnace failure overview for all manufactured home furnace brands: mobile home furnace diagnosis guide.
Browse all mobile home parts at American Supply and Air Products, or call 1-800-368-6208.
