Furnace · HVAC · mini-split · dishwasher · washer & dryer · water heater
A free, instant reference for what's flashing on your appliance's control board — what it means, what actually causes it, and whether it's a five-minute fix or a call-a-pro situation. Filter by appliance, filter by brand, or just search.
Reference information only — error code meanings vary by model and year. Always verify against your unit's own label or manual, and use a licensed professional for any gas, electrical, or refrigerant work. Full disclaimer
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Many appliances hide their diagnostics. Here's how each type actually reports faults.
Remove the lower front panel and look for a small LED on the control board — often visible through a peephole in the panel. It reports faults as a blink count (e.g. 3 flashes, pause, 3 flashes). The legend decoding each count is printed on a sticker inside the panel you just removed. Count the blinks between pauses, then search that count plus your brand above.
Codes show on the indoor unit's display, as a blinking pattern of its indicator lights, or on the remote. On many Mitsubishi and Daikin remotes you can hold the temperature or check button to cycle through fault codes. The outdoor unit often has its own board LED too.
Digital models show the code right on the display. Models without a display use blinking light patterns — count the flashes of the clean/start light between pauses (e.g. 2 flashes then 1 flash reads as "2-1"). Your model's tech sheet, usually folded inside the bottom kick panel or control console, decodes them.
Tankless units show codes on their front display or remote controller. Gas tank heaters usually blink an LED on the gas control valve near the bottom — count the flashes and check the legend on the tank's label. Electric tank heaters generally have no display at all: their one "code" is the red reset button popping out under the upper access panel.
A surprising share of error codes are transient. These five steps clear them safely, cost nothing, and are worth doing before ordering parts or booking service.
Never bypass a safety switch (limit switch, rollout switch, float switch, pressure switch) to keep an appliance running. Those switches shutting things down is the system working, not failing. And if you ever smell gas: skip all of this, leave the area, and call your gas utility from outside.
Please read this before acting on anything you find on this site.
Informational purposes only. The information on this site is provided for general informational and educational purposes only, on an "as is" basis, without warranties of any kind, express or implied, including but not limited to warranties of accuracy, completeness, merchantability, or fitness for a particular purpose. Error code meanings, diagnostic procedures, and repair guidance vary between manufacturers, product lines, models, and model years, and may change without notice. Nothing on this site constitutes professional advice, and this site is not a substitute for your appliance's official documentation or for diagnosis by a qualified, licensed technician. Always consult the manual or service documentation for your specific model before acting on anything you read here.
Assumption of risk. Any inspection, maintenance, or repair you perform is undertaken voluntarily and entirely at your own risk. Work involving natural gas, propane, electricity, refrigerants, or pressurized water systems can cause property damage, serious injury, carbon monoxide exposure, fire, or death if performed improperly, and in many jurisdictions may only lawfully be performed by licensed professionals. Refrigerant handling requires EPA certification in the United States. Never bypass or disable a safety device. If you smell gas, leave the area immediately and contact your gas utility or emergency services from a safe location.
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