The mobile home furnace reset button is a small red or white button on the furnace cabinet, usually near the burner assembly or on the blower compartment panel. Press it firmly until you feel or hear a click. That is the reset.
A furnace that starts and runs normally after a reset needs no further repair. When the system trips again within a few minutes, or the button is entirely missing, this guide covers your exact next steps.
The button acts as the manual thermal limit reset on a mobile home furnace. When the system overheats, the limit switch trips and shuts the system down. Pressing reset tells the switch to allow another heating attempt.
The button is a safety device, not a fix. Failing to resolve the actual overheating cause guarantees the switch will trip again in the exact same spot. Some homeowners press reset four or five times before realizing the furnace is trying to tell them something.
Open the front lower access panel. The reset button is on the burner assembly housing, typically a red button roughly the size of a pencil eraser. On some models it is labeled RESET. On older units the label has often worn off. Look for a small raised button near the gas valve or heat exchanger area.
Repeated resets failing to hold usually indicates a deeper brand-specific issue rather than just a dirty filter. You can pinpoint these exact faults using our Coleman mobile home furnace problems guide before assuming you need to buy a brand-new heating unit .
The limit switch and reset button on electric Coleman units are on the furnace plenum, accessible from the front panel. On EB series units, there may be multiple limit switches stacked on the plenum. Each has its own reset. A single tripped switch does not mean the others have failed. Check all of them before assuming the furnace needs a new replacement part
On Intertherm and Miller gas furnaces, the reset is typically on the burner box, accessible from the lower front panel. On Nordyne electric models, it is on the element housing or plenum. The button is always red on these units. If you have a multi-element electric furnace, each element bank may have its own limit switch.
1. Turn the thermostat down below the current room temperature so the furnace is not calling for heat while you are working.
2. Open the front lower access panel on the furnace.
3. Locate the reset button. On gas furnaces it is near the burner assembly. On electric furnaces it is on the plenum or element housing.
4. Press the button firmly. You should feel it click or give slightly. Do not hold it down. Press and release.
5. Close the panel. Set the thermostat above room temperature.
6. Watch the furnace through one full heating cycle, letting it run past the point it was previously shutting off.
If you cannot feel the button click, the switch may already be in the reset position. That means it did not trip so most likely the furnace problem is somewhere else.
The furnace ran a full cycle without shutting off early. The trip was a one-time event, likely from a brief airflow restriction that has since cleared. Change the air filter if you have not done so recently. A clogged filter is the single most common cause of limit switch trips.
A system that immediately trips the limit switch again means the underlying cause is still present. Whenever a mobile home furnace shuts off after a few minutes following a reset, you must address the root problem. Work through the checklist below to clear the airflow restrictions driving the temperature up
| What to Check | Why It Matters | How to Confirm |
|---|---|---|
| Air filter | Clogged filter is the most common cause of limit switch trips | Pull it out. If you cannot see light through it, replace it. |
| Return air grille | Blocked grille restricts return airflow to the furnace | Put your hand near it with the system running. You should feel suction. |
| Supply vents | Closed vents increase back pressure and cause overheating | Walk every room and open every vent. |
| Blower wheel | Debris-coated blades reduce airflow even with a clean filter | Open the front panel. Look at the fan blades for packed dust. |
| Limit switch itself | A switch that has tripped hundreds of times loses calibration | A furnace tripping despite clearing all four checks above indicates a failed switch. |
If the filter and airflow check out and the furnace still trips after every reset, the limit switch needs replacing.
Limit switches are model-specific. The temperature rating and terminal configuration vary by furnace. A switch rated 20 degrees lower than your furnace’s operating temperature trips constantly. One rated too high does not protect the furnace correctly.
Confirmed for mobile home furnace models — verify your model number matches before ordering:
When you need a new switch, you must match the brand exactly. For instance, we stock specific Coleman Evcon replacement parts tailored for their unique gas and electric models. When your data plate indicates a Nordyne system, you will need compatible Intertherm and Miller furnace parts instead. Confirm your exact model number from the data plate before ordering so the temperature rating matches your system
HVAC parts including limit switches cannot be returned once received. Confirm your model number before ordering. Full details: returns and refunds policy.
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HVAC parts cannot be returned once received. Confirm your part number before ordering.
Furnace trips the limit switch repeatedly after resetting: mobile home furnace shuts off after a few minutes.
Coleman-specific furnace problems and parts: Coleman mobile home furnace problems guide.
All furnace failure types in mobile homes: mobile home furnace diagnosis guide.
Finding the right fix is easier when you have reliable components. As experts at American Supply and Air Products, we stock the exact mobile home parts you need to get your heating system running safely again. Call 1-800-368-6208 with your model number, and our team will confirm your exact part before you order.
