# The Fault Code

> Error and flash codes for gas furnaces, washing machines, dishwashers, AC / heat pumps, mini-splits and tankless water heaters, explained in plain English. Each code page gives the meaning, likely causes, safe homeowner checks, when to call a qualified technician, and a link to the manufacturer manual or official support page the information came from. Codes we could not verify in a manual are not published.

Information only; not professional advice. Gas, venting, refrigerant, high-voltage wiring and control-board work should be done by a licensed technician. Written by The Fault Code. Questions: contact@thefaultcode.com.

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## Full text

- [Full site text](https://thefaultcode.com/llms-full.txt): every guide, every published code (meaning, causes, checks, and source), and the parts guides, in one Markdown file.

## Guides
- [AC High and Low Pressure Codes](https://thefaultcode.com/guides/ac-high-and-low-pressure-codes.md): What Carrier 31, 32, 83 and 84 and Goodman 01, L1, 02 and L2 mean on an AC or heat pump, and which airflow checks the service manuals leave with the homeowner.
- [AC Voltage and Power Codes: Brownout, L8, H8, E5](https://thefaultcode.com/guides/ac-voltage-and-power-codes.md): What Carrier 46, Goodman L8, H8 and E5 mean when an AC or heat pump reports low voltage, high voltage, or an open low-voltage fuse, and what is safe to check.
- [Dishwasher Leak Codes: E15, AE, LC and Suds](https://thefaultcode.com/guides/dishwasher-leak-codes.md): What Bosch E15, LG AE, LG bE and Samsung dishwasher LC mean when a dishwasher reports a leak or oversuds, and which of those codes tell you to stop and call.
- [Dishwasher Temperature, Detergent and Limescale Codes](https://thefaultcode.com/guides/dishwasher-temperature-and-detergent.md): What GE C6 and C8, Samsung 3E and 1E, LG HE, and Bosch E12 mean: incoming water temperature, a blocked detergent cup, a heater fault, and limescale.
- [Dishwasher Will Not Drain: E24, C1, OE and 5C](https://thefaultcode.com/guides/dishwasher-will-not-drain.md): What Bosch E24 and E25, GE C1 and C3, LG dishwasher OE and Samsung 5C mean when a dishwasher will not drain, including filters, air gaps and the disposal knockout.
- [Dishwasher Will Not Fill: E16, H2O, IE and 4C](https://thefaultcode.com/guides/dishwasher-will-not-fill.md): What Bosch E16, E17 and E18, GE H2O, LG dishwasher IE, and Samsung 4C and 9E mean when a dishwasher is not getting water.
- [Furnace Air Filters: How Often to Change and Why It Matters](https://thefaultcode.com/guides/furnace-air-filter-guide.md): How a dirty furnace filter causes limit and short-cycling faults, how often to check it, and what MERV ratings mean.
- [Furnace Blowing Cold Air: Common Causes](https://thefaultcode.com/guides/furnace-blowing-cold-air.md): Why a gas furnace blows cold or room-temperature air, from thermostat fan settings to limit and ignition faults, and what to check.
- [Furnace Flame Sensor: Symptoms, Codes and Cleaning](https://thefaultcode.com/guides/furnace-flame-sensor-cleaning.md): What a furnace flame sensor does, the codes that point to it, what the manuals say about cleaning it, and safety cautions.
- [Furnace Ignition Lockout: It Tried to Light and Stopped](https://thefaultcode.com/guides/furnace-ignition-lockout.md): What an ignition lockout means on York, Amana, American Standard, Bryant, Carrier, Goodman and Trane, and which checks the manuals leave with a homeowner.
- [Furnace Limit Switch Open: Blower Runs, No Heat](https://thefaultcode.com/guides/furnace-open-limit.md): What an open furnace limit means on York, Amana, American Standard and Bryant, which manuals name the filter, and why a rollout switch is a different shutdown.
- [Furnace No Heat: Winter 2026 Checklist](https://thefaultcode.com/guides/furnace-no-heat-winter-2026.md): Winter 2026 checklist for a gas furnace with no heat. Each step cites the manufacturer manual and links the matching fault-code page.
- [Furnace Pressure Switch Error: What It Means](https://thefaultcode.com/guides/furnace-pressure-switch-error.md): What a gas furnace pressure switch does, common pressure switch codes by brand, likely causes from the manuals and what to check.
- [Furnace Repair or Replace: How to Decide](https://thefaultcode.com/guides/furnace-repair-or-replace.md): Factors to weigh when deciding whether to repair or replace a gas furnace, based on U.S. Department of Energy and ENERGY STAR guidance.
- [Furnace Rollout Codes and Carbon Monoxide Safety](https://thefaultcode.com/guides/furnace-carbon-monoxide-and-rollout.md): 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.
- [Furnace Short Cycling: Causes and What to Check](https://thefaultcode.com/guides/furnace-short-cycling.md): Why a gas furnace turns on and off too often, the fault codes that often go with it, and safe checks before calling a technician.
- [Heat Pump Not Heating in the Cold](https://thefaultcode.com/guides/heat-pump-not-heating-in-the-cold.md): Why a heat pump can blow cool air or stop heating in cold weather, from Carrier's defrost rules and the outdoor-sensor codes, plus the American Standard balance-point setting.
- [How to Read a Bryant Evolution Outdoor Status Light](https://thefaultcode.com/guides/how-to-read-bryant-evolution-status-light.md): How the amber status LED on a Bryant 288BNV heat pump or 189BNV air conditioner flashes a two-digit fault, including the timing and the technician recall step.
- [How to Read a Bryant Furnace LED Code](https://thefaultcode.com/guides/how-to-read-bryant-furnace-led-codes.md): How the amber LED on a Bryant 80% two-stage variable-speed furnace flashes a two-digit status code, and how the troubleshooting guide says to recall stored codes.
- [How to Read a Furnace LED Flash Code](https://thefaultcode.com/guides/how-to-read-furnace-led-flash-codes.md): How to find and read the blinking LED or display code on a gas furnace control board, with brand-by-brand examples from the manuals.
- [How to Reset a Gas Furnace Safely](https://thefaultcode.com/guides/how-to-reset-a-furnace.md): When and how to reset a gas furnace after a lockout, what the manuals say about automatic resets, and when not to reset.
- [Washer Door Will Not Lock: dE and F5 E2](https://thefaultcode.com/guides/washer-door-will-not-lock.md): What LG dE and dE2, Samsung dE, and Whirlpool F5 E2 mean when a washer door will not lock, and why you should not bypass the lock.
- [Washer Suds Codes: HE Detergent and Too Many Suds](https://thefaultcode.com/guides/washer-suds-and-detergent.md): What LG Sud, Samsung SUd and Whirlpool Sud mean, how much detergent those pages allow, and how suds also cause drain and leak codes.
- [Washer Unbalanced Load, Overfill and Leak Codes](https://thefaultcode.com/guides/washer-unbalanced-and-leaks.md): What LG UE, Samsung UE, LG FE and Samsung washer LC mean, and the load, level, hose and detergent checks those support pages publish.
- [Washer Will Not Drain: OE, 5C and F9 E1](https://thefaultcode.com/guides/washer-will-not-drain.md): What LG OE, Samsung 5C and Whirlpool F9 E1 mean when a washer will not drain, and the hose, filter and suds checks each brand publishes.
- [Washer Will Not Fill: IE, 4C and F8 E1](https://thefaultcode.com/guides/washer-will-not-fill.md): Why a washer shows LG IE, Samsung 4C or 4C2, or Whirlpool F8 E1, and the faucet, hose and inlet-filter checks each brand publishes.
- [Why Is My Furnace Blinking a Code?](https://thefaultcode.com/guides/why-is-my-furnace-blinking.md): What a blinking light on your furnace means, which faults are most often behind it, and what you can safely check yourself.

## Parts and tools guides
- [All parts and tools guides](https://thefaultcode.com/parts/): what each part, tool or supply named in the manuals is, how to choose and test it
- [Furnace flame sensor](https://thefaultcode.com/parts/flame-sensor/): What a furnace flame sensor does, which codes point to it, how manuals say to clean it, how to choose a replacement and how a technician tests it.
- [Furnace hot surface igniter](https://thefaultcode.com/parts/hot-surface-igniter/): What a hot surface igniter does, the furnace codes that name it, the resistance range Trane gives, and how to choose a replacement.
- [Furnace pressure switch](https://thefaultcode.com/parts/pressure-switch/): What a furnace pressure switch proves, codes that point to it, why you should never jumper it, and how to choose a replacement.
- [Furnace pressure switch hose](https://thefaultcode.com/parts/pressure-switch-hose/): The small hose between the inducer housing and the pressure switch: why it matters, and which codes name it.
- [Furnace inducer (draft) motor](https://thefaultcode.com/parts/inducer-motor/): What the inducer motor does, the codes that name it, and what to know before buying an inducer assembly.
- [Furnace blower (circulator) motor](https://thefaultcode.com/parts/blower-motor/): The furnace circulator blower motor: codes that name it, why airflow comes first, and what to know before buying a replacement.
- [Run capacitor (furnace blower and AC)](https://thefaultcode.com/parts/run-capacitor/): What a run capacitor does, which furnace and AC codes mention it, the testing method in the Goodman service manual and its discharge warning.
- [Furnace control board and low-voltage fuse](https://thefaultcode.com/parts/control-board/): What an integrated furnace control board does, the codes that name it, why a blown fuse comes first, and how to buy a board safely.
- [High limit and rollout switches](https://thefaultcode.com/parts/limit-and-rollout-switches/): What furnace high limit and flame rollout switches protect, which codes mention them and why we do not link replacements.
- [Thermostat](https://thefaultcode.com/parts/thermostat/): How a thermostat fits into furnace and AC codes, how to check compatibility, and where your manual covers the wiring.
- [Furnace and AC air filter](https://thefaultcode.com/parts/hvac-air-filter/): How a dirty filter triggers furnace and AC codes, how often to change it, how to read the size and what the MERV rating means.
- [Furnace filter sizes: how to read and match yours](https://thefaultcode.com/parts/furnace-filter-sizes/): How to read the nominal size on a furnace filter, why actual size is smaller, and links for common 1-inch sizes.
- [AC and heat pump coil cleaning supplies](https://thefaultcode.com/parts/coil-cleaning/): Why Carrier and Goodman AC codes tell you to check the coils for debris or ice, and the soft-touch supplies for gentle cleaning.
- [Multimeter for appliance and HVAC diagnosis](https://thefaultcode.com/parts/multimeter/): What a multimeter measures, which manual steps call for one, how to choose one and the rules for using it safely.
- [Non-contact voltage tester](https://thefaultcode.com/parts/voltage-tester/): How a non-contact voltage tester works, how to choose a dual-range model and why it never replaces switching power off.
- [Nut driver set](https://thefaultcode.com/parts/nut-driver-set/): Why nut drivers suit appliance and furnace panels, which sizes a common set covers and what insulated means.
- [Level and wrench for levelling a washer or dishwasher](https://thefaultcode.com/parts/leveling-tools/): LG and Samsung say an unlevel washer can cause UE and drain faults. What to use to check and adjust levelling.
- [Washer drain pump filter](https://thefaultcode.com/parts/washer-drain-pump-filter/): How a clogged front-load washer pump filter causes OE, 5C and similar drain faults, what LG and Samsung say to do and what to have on hand.
- [Washer drain hose](https://thefaultcode.com/parts/washer-drain-hose/): Drain hose rules from LG, Samsung and Whirlpool: kinks, how far into the standpipe, the U-shaped form and standpipe height.
- [Washer water inlet hoses](https://thefaultcode.com/parts/washer-inlet-hoses/): Hot/cold connections, kinks and inlet filters from Samsung and Whirlpool, and what to know before buying washer supply hoses.
- [Washing machine cleaner (Tub Clean)](https://thefaultcode.com/parts/washer-cleaner/): LG tCL is a reminder to run Tub Clean. What LG says to put in the tub, and how washer cleaner tablets are used.
- [HE laundry detergent](https://thefaultcode.com/parts/he-detergent/): LG Sud, Samsung SUd and Whirlpool Sud all point to detergent. What HE detergent is and how much the manufacturers say to use.
- [Dishwasher filter cleaning](https://thefaultcode.com/parts/dishwasher-filter-cleaning/): Bosch E22, E24 and E25, LG OE and Samsung 1E all start with the dishwasher filter. What the manufacturers say and what to use.
- [Dishwasher drain hose](https://thefaultcode.com/parts/dishwasher-drain-hose/): Drain hose, air gap and high loop checks from GE, LG, Samsung and Bosch, and what to buy if the hose is damaged.
- [Dishwasher water supply line](https://thefaultcode.com/parts/dishwasher-supply-line/): Bosch E16 to E18, LG IE and GE H2O all start with a kinked inlet hose or closed valve. What to check and what to buy.
- [Dishwasher descaler and cleaner](https://thefaultcode.com/parts/dishwasher-descaler/): Bosch E12 is limescale in the heat pump. What Bosch says and how dishwasher cleaner tablets are used.
- [Dishwasher softening salt](https://thefaultcode.com/parts/dishwasher-salt/): Bosch says to use softening salt, if the dishwasher has a water softener, to help prevent E12 limescale.
- [Dishwasher detergent](https://thefaultcode.com/parts/dishwasher-detergent/): LG bE and AE point to the wrong detergent. What LG says to use and not use.

## Part finder
A code is listed under a part only when that code's manufacturer document names the part. The sentence and the source are on the part page.
- [Part finder](https://thefaultcode.com/part-finder/)
- [Flame sensor](https://thefaultcode.com/part-finder/flame-sensor/): 22 codes name it
- [Hot surface igniter](https://thefaultcode.com/part-finder/igniter/): 14 codes name it
- [Pressure switch](https://thefaultcode.com/part-finder/pressure-switch/): 29 codes name it
- [Pressure switch hose](https://thefaultcode.com/part-finder/pressure-hose/): 17 codes name it
- [Inducer (draft) motor](https://thefaultcode.com/part-finder/inducer/): 21 codes name it
- [Furnace air filter](https://thefaultcode.com/part-finder/filter/): 11 codes name it
- [Limit switch](https://thefaultcode.com/part-finder/limit-switch/): 11 codes name it
- [Rollout switch](https://thefaultcode.com/part-finder/rollout-switch/): 10 codes name it
- [Blower motor](https://thefaultcode.com/part-finder/blower-motor/): 16 codes name it
- [Run capacitor](https://thefaultcode.com/part-finder/capacitor/): 5 codes name it
- [Control board](https://thefaultcode.com/part-finder/control-board/): 22 codes name it
- [Control-board fuse](https://thefaultcode.com/part-finder/fuse/): 7 codes name it
- [Gas valve](https://thefaultcode.com/part-finder/gas-valve/): 20 codes name it
- [Washer inlet hose](https://thefaultcode.com/part-finder/washer-fill-hose/): 3 codes name it
- [Washer drain hose](https://thefaultcode.com/part-finder/washer-drain-hose/): 4 codes name it
- [Dishwasher inlet hose](https://thefaultcode.com/part-finder/dishwasher-fill-hose/): 5 codes name it
- [Dishwasher drain hose](https://thefaultcode.com/part-finder/dishwasher-drain-hose/): 4 codes name it

## Equipment categories
- [Furnaces error codes](https://thefaultcode.com/furnaces/): 151 codes
- [Washing machines error codes](https://thefaultcode.com/washers/): 35 codes
- [Dishwashers error codes](https://thefaultcode.com/dishwashers/): 48 codes
- [AC and heat pumps error codes](https://thefaultcode.com/ac/): 67 codes
- [Tankless water heaters error codes](https://thefaultcode.com/water-heaters/): 11 codes

## Brand code lists
- [Amana furnace error codes](https://thefaultcode.com/amana/): 11 codes
- [American Standard furnace error codes](https://thefaultcode.com/american-standard/): 13 codes
- [Bryant furnace error codes](https://thefaultcode.com/bryant/): 19 codes
- [Carrier furnace error codes](https://thefaultcode.com/carrier/): 15 codes
- [Goodman furnace error codes](https://thefaultcode.com/goodman/): 23 codes
- [Lennox furnace error codes](https://thefaultcode.com/lennox/): 14 codes
- [Rheem furnace error codes](https://thefaultcode.com/rheem/): 19 codes
- [Trane furnace error codes](https://thefaultcode.com/trane/): 25 codes
- [York furnace error codes](https://thefaultcode.com/york/): 12 codes
- [LG washing machine error codes](https://thefaultcode.com/washers/lg/): 17 codes
- [Samsung washing machine error codes](https://thefaultcode.com/washers/samsung/): 10 codes
- [Whirlpool washing machine error codes](https://thefaultcode.com/washers/whirlpool/): 8 codes
- [Bosch dishwasher error codes](https://thefaultcode.com/dishwashers/bosch/): 15 codes
- [GE dishwasher error codes](https://thefaultcode.com/dishwashers/ge/): 10 codes
- [LG dishwasher error codes](https://thefaultcode.com/dishwashers/lg/): 9 codes
- [Samsung dishwasher error codes](https://thefaultcode.com/dishwashers/samsung/): 14 codes
- [Bryant AC / heat pump error codes](https://thefaultcode.com/ac/bryant/): 11 codes
- [Carrier AC / heat pump error codes](https://thefaultcode.com/ac/carrier/): 16 codes
- [Daikin AC / heat pump error codes](https://thefaultcode.com/ac/daikin/): 5 codes
- [Fujitsu AC / heat pump error codes](https://thefaultcode.com/ac/fujitsu/): 5 codes
- [Goodman AC / heat pump error codes](https://thefaultcode.com/ac/goodman/): 25 codes
- [Mitsubishi AC / heat pump error codes](https://thefaultcode.com/ac/mitsubishi/): 5 codes
- [Navien tankless water heater error codes](https://thefaultcode.com/water-heaters/navien/): 6 codes
- [Rinnai tankless water heater error codes](https://thefaultcode.com/water-heaters/rinnai/): 5 codes

## Data
- [Fault code dataset](https://thefaultcode.com/data/): every published code with brand, category, meaning and manufacturer source link
- [fault-codes.csv](https://thefaultcode.com/data/fault-codes.csv): the same dataset as CSV
- [fault-codes.json](https://thefaultcode.com/data/fault-codes.json): the same dataset as JSON

## Other
- [About](https://thefaultcode.com/about/): how codes are sourced, and who writes the site
- [Dataset](https://thefaultcode.com/data/)
- [Sitemap](https://thefaultcode.com/sitemap-index.xml)

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