Air conditioner faults common to all brands
Most air conditioning problems arrive without a code, because a domestic split has nothing to display one on. These pages start from what you can actually see — water dripping, no cold air, a unit that has stopped — and tell you how to get the stored fault out of it.
Do not treat this as Daikin, Mitsubishi Electric or Toshiba's retrieval procedure. Each one is different, and Toshiba's technical handbook says switching the power off can clear the diagnostic memory. The instinct to reset first is the wrong first move on that equipment. Get the code, then open the brand hub.
A blocked indoor filter presents as freezing or poor cooling, and on some systems as a reading that looks like a refrigerant fault. Cleaning it is yours. The sealed circuit is not: pressures, charge and the compressor are certified refrigerant work. Water dripping from the indoor unit is usually a blocked drain, not a failed pump — Mitsubishi say so directly. If you can smell burning at the outdoor isolator, leave it off and call an electrician.
Named-brand hubs in this category: Daikin, Mitsubishi Electric and Toshiba. Those pages carry the manufacturer’s own table; this one does not replace them.
How these displays appear
There is almost never a screen. The fault sits in memory and comes out through the remote controller or as a pattern of flashing lights on the indoor unit, and the procedure differs by manufacturer. One warning before you start: Toshiba’s technical handbook says that switching the power off clears the diagnostic memory on their equipment, and although their current service manual says the newest units keep the code, you cannot tell which yours does from the room — so read the code before you try anything else.
What a reset actually does
The only reset worth attempting is switching off at the isolator or the breaker, leaving it for a minute, and switching back on — and on some brands that is potentially the wrong first move because it may wipe the stored fault. Get the code first if your unit can give you one. The manufacturers do publish that power cycle in narrow terms: Daikin for a unit that has stopped with its lamp flashing, after cleaning the filters and clearing the inlets and outlets, and for misbehaviour after lightning or radio interference; Mitsubishi for their non-defined noise error, thirty seconds off. Beyond that there is no owner reset: the refrigerant circuit is certified work by law and the electrical enclosures on both the indoor and outdoor units carry mains voltage.
Most common shared air conditioning faults
The air conditioner displays people look up most, whichever badge is on the appliance.
- Water dripping from the indoor unitGet it checkedUsually a blocked drain rather than a failed pump. Mitsubishi say so directly: their pump runs constantly in cooling and rarely fails.
- Not blowing coldGet it checkedCheck the filter before anything else. A blocked one does not look like a dirty filter — it looks like poor cooling, icing, or a refrigerant fault.
- How to get the fault codeUsually simple to fixThere is no display, so you have to ask the unit. Every brand does it differently, and Toshiba's handbook says to read the code before cutting the power.
- Outdoor unit not runningGet it checkedUsually not dead at all. A restart delay, a defrost or a satisfied room stops the outdoor unit by design, and on a domestic split a lit indoor unit means the supply is on.
Every shared air conditioner fault
4 published shared pages. Filtering happens in the page — every one is in the HTML.
Showing 4 of 4 codes
Air conditioning these pages cover
These pages apply across types. The split is by how the appliance is built, not by badge.