# Furnace Rollout Codes and Carbon Monoxide Safety

> What a furnace rollout or open-limit code means, which of those codes are technician-only, and what CPSC says about carbon monoxide alarms and symptoms.

An open rollout switch means flame left the burner area. Rheem calls code 33 a very serious problem to repair before the furnace runs again. Goodman E11, Carrier 33 and 13, and Trane E04 are the related codes on this site. Carbon monoxide is a separate hazard: CPSC describes it as a colorless, odorless poisonous gas and says to install CO alarms on every level and outside sleeping areas. A rollout code is a reason to stop the furnace and call a technician, not a code to reset.

## Two different warnings
A furnace status light and a carbon monoxide alarm are not the same instrument. The light reports what the control board measured: an open switch, a failed ignition, a pressure switch that did not close. A CO alarm samples the air in the room. You can have a rollout code with an alarm that is silent, and you can have an alarm sounding with no furnace code at all, because the source might be a car left running, a generator, a grill, or a water heater. This page keeps those two warnings separate and says what each published source supports.

If you feel ill, follow the alarm instructions, not the furnace manual. If you smell gas, leave and call the gas utility from outside. Do not stay to read the LED.

## What CPSC says about carbon monoxide
The U.S. Consumer Product Safety Commission calls carbon monoxide the "Invisible Killer" because it is a colorless, odorless, poisonous gas. CPSC says more than 200 people in the United States die every year from accidental, non-fire-related CO poisoning associated with consumer products, and that more than 100 of those deaths are linked to portable generators.

CPSC's protection steps, from its Carbon Monoxide Information Center:

- Never use a portable generator inside a home or a garage, even if the doors and windows are open. Use generators outside only, at least 20 feet from the home, with the exhaust facing away.
- Install battery-operated CO alarms, or CO alarms with battery backup, on every level of the home and outside sleeping areas. CPSC says interconnected alarms are best: when one sounds, they all sound.
- Know the symptoms: headache, dizziness, weakness, nausea, vomiting, sleepiness and confusion. If you suspect CO poisoning, get outside to fresh air immediately, and then call 911.

NFPA's carbon monoxide safety page is the other public safety source linked from this site. Neither page says a furnace flash code is a substitute for an alarm. The shop button on this guide searches Amazon for a carbon monoxide alarm. Place and test it the way the alarm's instructions and CPSC describe. An alarm does not repair a heat exchanger, and a new alarm is not a reason to keep running a furnace that has rolled out.

## What rollout means on these furnaces
Rollout means flame came out of the burner box instead of staying in it. The switch that watches for that is a safety switch. It is manual reset on several of these furnaces, which is exactly why people reset it and walk away. The manuals say not to.

| Code | What the manual says |
|---|---|
| [Goodman E11](https://thefaultcode.com/goodman/e11/) | Open rollout switch. Causes listed: incorrect gas pressure, incorrect burner alignment, burner restriction. All three steps are technician checks. |
| [Rheem 33](https://thefaultcode.com/rheem/33/) | Over-temperature (rollout) switch open. Flames rolled out of the heat exchanger into the burner compartment. The manual calls this a very serious problem to be repaired before operation continues. |
| [Trane E04](https://thefaultcode.com/trane/e04/) | Open limit. That can be the main thermal limit, the flame rollout switch, or the reverse airflow switch. |
| [Carrier 33](https://thefaultcode.com/carrier/33/) | Limit circuit fault. A limit or flame rollout switch is open. It becomes lockout 13 if the switch stays open longer than 3 minutes. |
| [Carrier 13](https://thefaultcode.com/carrier/13/) | Limit circuit lockout. A limit or rollout switch was open longer than 3 minutes. The control auto-resets after 3 hours. |

Goodman E11 has no homeowner step. The technician checks gas pressure, burner alignment and burner restriction. Call. Do not cycle power to see if E11 was a glitch. The code page says not to keep resetting a tripped rollout switch.

Rheem 33's technician checks are pressure switches, inducer speed, vent length and obstructions, gaskets, wiring, burner seals and the heat exchanger. "Very serious" and "before operation continues" are the manual's words, quoted on the code page. There is no filter step on Rheem 33. A dirty filter is a different limit problem.

Trane E04 can be an ordinary high-limit trip or a rollout. The homeowner step Trane allows is to turn off power and make sure the filter is clean. Everything else is technician: blower, static pressure, heat rise, gas pressure, and, for rollout, the flue, the orifices, the burners and the heat exchanger before anyone resets the rollout switches. Trane says never to leave limit switches jumpered. If a rollout switch has tripped, call. If the code returns after a filter change, call.

Carrier 33 and 13 share causes: a dirty filter or restricted ducts, a restricted or wrongly sized vent, a loose blower wheel, a defective blower motor or capacitor, a defective switch, inadequate combustion air when the rollout switch is the one that opened, and excessive wind. Carrier 33 also lists improper gas input. The homeowner steps are to turn off power, check or replace a dirty filter, and make sure return and supply grilles are open. Carrier says the flame rollout switch requires a manual reset only after the cause is found. If the furnace locks out again after a filter change, or if a rollout switch has tripped, call. Lockout 13 auto-resets after 3 hours. That timer is not a repair. It will lock out again if the switch opens again.

[Lennox E200](https://thefaultcode.com/lennox/e200/) is the SL280DFNV hard lockout for a rollout circuit that is open or was open. The installation instructions say to correct the cause of the rollout trip, or replace the flame rollout switch, and then test the furnace. It clears after the fault is recovered. That is not the ML180 red-and-green limit pattern, and it is not E250, which is the limit circuit. Leave E200 off until a technician has found why the rollout opened.

[York 5 red flashes](https://thefaultcode.com/york/5-red-flashes/) is only the rollout switch. The TG9S manual says it is manually reset, the control hard-locks, and the checks are combustion air, inducer operation, and the primary heat exchanger or burners. Power is cycled after that problem is corrected, not before. [Bryant 13](https://thefaultcode.com/bryant/13/) is the lockout after a limit or rollout switch stayed open longer than 3 minutes. [Bryant 33](https://thefaultcode.com/bryant/33/) is the 80% two-stage chart's limit fault, and it says the flame rollout switch requires a manual reset. That chart is not the 926TB service label. [American Standard E04](https://thefaultcode.com/american-standard/e04/) names the main thermal limit, a rollout switch, or the reverse airflow switch in one code. If the burners look scorched, treat E04 as rollout and leave the furnace off. York 4 red flashes is the main limit and does list a dirty filter. Do not use that filter step on 5 red flashes.

The [limit and rollout switches](https://thefaultcode.com/parts/limit-and-rollout-switches/) page explains the parts and does not sell replacements. A rollout switch is not a maintenance item.

## High limit is related, and it is not rollout
An open high limit often means the heat exchanger got too hot because air was not moving across it. That can be a dirty filter. It is still a safety shutdown, and it is not the same sentence as "flames rolled out of the heat exchanger."

[Goodman EE3](https://thefaultcode.com/goodman/ee3/) is an open primary limit. The circulator blower runs continuously and there is no heat. Causes include blocked filters, restrictive ductwork, a blower that is the wrong speed or has failed, and wiring in the limit circuit. The homeowner steps are the filter and open registers. If those do not clear it, call. EE3 is the code the [furnace filter guide](https://thefaultcode.com/guides/furnace-air-filter-guide/) and the [cold air guide](https://thefaultcode.com/guides/furnace-blowing-cold-air/) already discuss.

[Trane E04](https://thefaultcode.com/trane/e04/) covers both the thermal limit and the rollout switch, which is why the filter check and the "call if rollout tripped" instruction are on the same page. Read the technician's finding. Do not assume a filter fixed a rollout.

The DOE Energy Saver guide says to clean or replace furnace filters once a month or as recommended. That is the maintenance that prevents a large share of limit trips. It does not prevent a cracked heat exchanger or a wrong gas pressure, which are the rollout causes Goodman lists.

## Condensate is not rollout either
[Rheem 59](https://thefaultcode.com/rheem/59/) means water was sensed in the collector box, and gas heat will not run. Causes include a blocked condensate drain or trap, and sensor wiring problems. The homeowner step is to turn off power and check the drain and the trap for a blockage. If that does not fix it, call. People land on 59 while chasing 33 because both stop the furnace. The display is two different numbers. A blocked drain is not flames in the burner box. Do not reset a rollout switch because you also found water in a hose.

## What to do, in order
1. If anyone has the symptoms CPSC lists, or a CO alarm is sounding, get everyone outside and call 911. Do not ventilate the house and go back in to watch the furnace.
2. If you smell gas, leave and call the gas utility from outside. Do not operate switches.
3. If the display or the flash code is a rollout code, turn the furnace off at its switch or the breaker and leave it off. Call a licensed HVAC technician. Tell them which code it is.
4. If the code is a high-limit code and the manual's only homeowner step is the filter, change the filter, open the registers, and try one more call for heat. If the code returns, call. Do not jumper the switch to finish the night. Carrier, Trane and the other manuals on these pages forbid that.
5. Install CO alarms the way CPSC describes if you do not already have them, on every level and outside sleeping areas, with battery backup, and test them. That step is for the air in the house. It is not a furnace repair.

How to read the light in the first place is the [flash code guide](https://thefaultcode.com/guides/how-to-read-furnace-led-flash-codes/). Why the light is blinking at all, including ignition and pressure codes that are not rollout, is [why the furnace is blinking](https://thefaultcode.com/guides/why-is-my-furnace-blinking/). How resets work, and which lockouts reset themselves, is [how to reset a furnace](https://thefaultcode.com/guides/how-to-reset-a-furnace/). None of those guides tell you to reset a rollout switch that has not been diagnosed.

## Alarms and filters are the shop links
The buttons search Amazon for a carbon monoxide alarm and for a furnace air filter. Match the filter size to the one you are removing. Choose an alarm that is a CO alarm, follow its instructions for placement, and keep CPSC's generator rule in mind: a generator in the garage is not made safe by an alarm in the hallway. The alarm is there so you wake up. The generator still has to be outside, at least 20 feet away, exhaust pointed away.

A cracked heat exchanger is something ENERGY STAR notes can make heating equipment operate less safely. It is on the [repair or replace](https://thefaultcode.com/guides/furnace-repair-or-replace/) page as a technician's finding, not as a code you can confirm from the hallway. If a technician reports one, stop using the furnace until it is repaired or replaced. Do not run it because the CO alarm has not gone off yet. CPSC's point is that you cannot see or smell the gas.

> **Safety first:** Smell gas? Leave the building and call the gas utility from outside. Do not reset a rollout switch. Do not jumper a limit. Gas, venting and heat-exchanger work belongs to a licensed HVAC technician. If a CO alarm sounds or people are sick, go outside and call 911.

## FAQ
### Does a rollout code mean carbon monoxide is in the house?

The manuals do not say that. They say flame rolled out of the burner area or a limit switch is open. That is a combustion problem, which is why you stop using the furnace. CO can be present with no code at all. CPSC's protection is a CO alarm, not a furnace light.

### What are the symptoms CPSC lists?

Headache, dizziness, weakness, nausea, vomiting, sleepiness and confusion. CPSC says if you suspect CO poisoning, get outside to fresh air immediately, and then call 911.

### Can I reset a rollout switch once?

Carrier says a flame rollout switch requires manual reset only after the cause is found. Goodman E11's steps are all technician checks of gas pressure, burner alignment and burner restriction. Rheem says to repair code 33 before operation continues. Do not reset it to get heat tonight.

## Sources
- [CPSC Carbon Monoxide Information Center](https://www.cpsc.gov/Safety-Education/Safety-Education-Centers/Carbon-Monoxide-Information-Center)
- [NFPA carbon monoxide safety](https://www.nfpa.org/education-and-research/home-fire-safety/carbon-monoxide)
- [Goodman GR9S96/GD9S96 installation and operating guide (IOG-2037B)](https://cdn.daikincloud.io/PIM/Assets/Documents/IM-IOG-2037B.pdf)
- [Carrier 59SC5 installation, start-up and operating instructions](https://hvactechgroup.com/files/59sc5.pdf)
- [Rheem R96V installation instructions (92-24161-124-03)](https://pts.rheem.com/docstore/webdocs/Public/ServicePublic/Trouble2a/pdfs/Gas_Furnace/R96V/92-24161-124-03_R96V.pdf)
- [Trane S9V2 Service Facts (S9V2-SF-2A-EN)](https://www.wbmemphis.com/customer/docs/skudocs/s9v2-sf-2a-en-03052021.pdf)
- [U.S. Department of Energy, Energy Saver guide (PDF)](https://www.energy.gov/sites/default/files/2022-08/energy-saver-guide-2022.pdf)
- [York TG9S installation manual (Johnson Controls 1083287-UIM-C-0715)](https://www.hvacdiscounters.com/customer/docs/skudocs/coltg9s-iom-manual.pdf)
- [Bryant 926TB installation, start-up, operating and service instructions](https://www.shareddocs.com/hvac/docs/1009/Public/06/II926TB-04.pdf)
- [Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02)](https://www.shareddocs.com/hvac/docs/1009/Public/0D/TG-GFB80-02.pdf)
- [American Standard S9V2 installer's guide (18-CE01D1-1E-EN)](https://americanstandardair.com/content/dam/Trane/Commercial/global/products-systems/equipment/unitary/split-systems/Small%20Splits/Furnaces/18-CE01D1-1E-EN_11112016.pdf)
- [Lennox SL280DFNV installation instructions 508150-02](https://www.lennox.com/dA/78477aadd3/508150-02a.pdf)

Canonical page: https://thefaultcode.com/guides/furnace-carbon-monoxide-and-rollout/