Daikin Air Conditioner Code 00: What It Means

What error 00 means

Code 00 on a Daikin air conditioner is not an error. Daikin India's own error-code page and the Daikin room air conditioner operation manual both list 00 at the top of the fault diagnosis table, under SYSTEM, with the meaning NORMAL. It is also the first thing you see when you start the diagnosis procedure: Daikin's instructions say that when the CANCEL button on the remote is held down for about 5 seconds, 00 blinks in the temperature display section. From there you press CANCEL repeatedly to step through the codes; a long beep means the code on the display is the one the indoor unit has logged, and a short beep means that code does not apply. So if you searched for Daikin AC error 00, one of two things is true: either you entered fault diagnosis and saw 00 blinking before stepping to the real code, or the unit has no fault stored and 00 with a long beep is the answer. Either way, 00 itself is Daikin's word for normal.

Why error 00 happens on a Daikin Air Conditioner

On a Daikin Air Conditioner, error 00typically resolves to one of three root-cause categories. They’re ordered cheapest-to-verify first — start at the top and only escalate if the first cause is ruled out.

• Mechanical: blockage, obstruction, or worn moving part. A common cause across Daikin Air Conditioners in India — air filters clog and fan bearings and drain lines collect dust and sludge. Our step-by-step fix below targets this category first because it’s the cheapest to verify and resolvereports.
• Electrical: voltage spike, sensor fault, or PCB anomaly. India’s grid carries more voltage fluctuation than many appliance design tolerances assume, and a routine surge or sag can be enough to throw 00. If you’ve had recent voltage events (lights flickering, AC tripping), start your investigation here. A working stabilizer prevents this entire category.
• Software / configuration: stuck child-lock, demo-mode, or pending firmware reset.Less common but the cheapest fix when it applies — a 60-second factory reset clears it. We list this last because it’s rarely the actual cause, but check it before disassembling anything.

Safety first

Step-by-step fix

1. 1

   Step 1

   Understand what 00 is telling you

   Daikin's fault diagnosis table lists 00 as NORMAL. It is the starting point of the diagnosis procedure, not a fault. If you held CANCEL and saw 00 blinking, you have simply opened the diagnosis mode and have not yet stepped to the stored code. If you pressed through the codes and the long beep sounded at 00, the indoor unit is reporting that it has no fault to show.

   Pro tip: Daikin's table groups codes as SYSTEM (00, UA, U0, U2, U4), INDOOR UNIT (A1, A5, A6, C4, C9) and OUTDOOR UNIT (E1 onwards). 00 is the only entry that means nothing is wrong.

2. 2

   Step 2

   Step through to the real code

   Point the remote at the indoor unit. Hold CANCEL for about 5 seconds until 00 blinks. Now press CANCEL once at a time. Each press changes the two-character code on the display. Listen after each press: a short beep means that code does not match what the unit has stored, a long beep means it does. Stop at the long beep and write that code down. If you get back round to 00 with only short beeps in between, or the long beep sounds at 00, the unit has no stored fault.

   Pro tip: Hold CANCEL for about 5 seconds again to leave the display, or just wait: Daikin's manual says the code display cancels itself if no button is pressed for 1 minute.

3. 3

   Step 3

   If the unit has no fault stored but is not cooling, do Daikin's basic checks

   Daikin's troubleshooting for an AC that stops or will not cool starts with the ordinary causes: dirty air filters, something blocking the air inlet or outlet of the indoor or outdoor unit, a window or door left open, the set temperature not low enough, or the unit sitting in a timer or sleep mode. Switch off at the breaker, clean the filters, clear the air paths at both units, then restart with the remote.

   Caution: Switch off at the breaker before opening the front panel or going near the outdoor unit.

4. 4

   Step 4

   Switch off at the circuit breaker and restart

   Switch the AC off with the remote, then switch off its circuit breaker (MCB) and leave it off for at least 5 minutes so both boards fully discharge. Switch the breaker back on and start the AC in Cool mode with the remote. Daikin's own troubleshooting for an indoor unit whose operation lamp is blinking is exactly this: clean the filters, clear any obstruction at the air inlet or outlet of either unit, then restart with the remote, and if the lamp is still blinking, check the error code and consult the service centre. The manual also notes that lightning or radio waves can upset the unit, and that turning the breaker off and on is the remedy.

   Caution: Do not keep resetting the AC over and over if the code returns each time. Each restart puts the same component through the same fault.

5. 5

   Step 5

   Watch the operation lamp

   After the restart, watch the operation lamp on the indoor unit. Daikin's manual says that if the lamp stops blinking after the filter and obstruction checks, there is no malfunction. If the lamp is still blinking, re-run the diagnosis from step 2: a unit that has just tripped will now hold a real code, and that code is what the service centre needs.

   Pro tip: Note the time of day and what the AC was doing when it stopped; patterns such as every hot afternoon or every evening peak help the technician.

6. 6

   Step 6

   Consult Daikin service if the AC still misbehaves

   If the AC keeps stopping, or never cools properly, yet diagnosis keeps returning 00, the fault is one the indoor unit is not logging, and it needs a technician with Daikin's service tools. Call Daikin India customer care with the model number from the indoor unit label and a description of what happens. If the unit is within its warranty period, use Daikin authorised service only.

   Caution: Do not open either unit's electrical cover yourself.

Fixed it? Protect it next time. See an extended warranty plan for your Air Conditioner →

Common mistakes Daikin Air Conditioner owners make with error 00

These six anti-patterns turn a routine 30-minute fix into a costly repair or warranty void. Read before starting.

• Forcing a stuck door, lid, or panel. Prising open a Daikin Air Conditioner housing while it is in a fault state. Forcing it usually breaks the latch or sensor — turning a small part replacement into a full service call. If the door won’t open, run the safety-disconnect step first, then try again.
• Repeated unplug-and-replug as a “reset” ritual. Cycling power three or four times without diagnosing the underlying cause stresses the PCB and can convert a soft fault into a permanent firmware-corruption code. Reset once, observe whether the error returns immediately, then move to actual diagnosis if it does.
• Pouring water (or any liquid) into electronics-adjacent areas to flush a blockage.Even a small amount near the PCB or main wiring harness can cause permanent damage that voids warranty. The unit’s drainage paths exist for a reason; if a blockage isn’t cleared by the manual procedure, it isn’t getting cleared by improvisation either.
• Skipping the safety-disconnect step.“I’ll just check quickly” is the most expensive sentence in appliance repair. Working live on a 230V circuit (especially with a hot or wet appliance) carries real shock risk and instantly voids any warranty claim. Disconnect, wait two minutes for capacitor drain, then proceed.
• Buying counterfeit replacement parts on Amazon.in. Red flags: price below 60% of Daikin authorised price, generic packaging without a model-compatibility list, seller name that doesn’t match a known Daikin parts distributor, listings dated within the last 30 days with no reviews. Counterfeit parts often work for 2-3 weeks then fail with a different error, costing you double.
• Calling an “independent” technician for a warranty-covered unit. Indian appliances under Daikin warranty must be serviced by authorised technicians or the warranty voids permanently. Even if the warranty is expired, third-party local technicians often replace working parts to inflate the bill — verify each part swap by asking to see the failure on the old part before they install the new one.

Preventing future 00 on your Daikin Air Conditioner

The fix above resolves the current instance. These five maintenance habits prevent it from coming back, specific to Daikin Air Conditioners in Indian operating conditions (hard water, voltage variability, monsoon humidity).

• Monthly: wash the air filters and clear the drain line. Hard-water deposits and everyday debris are a frequent cause of recurring 00 in India, and a few minutes each month is the cheapest way to avoid a repeat.
• Quarterly: descale water-touching components. Use food-grade citric acid or a Daikin approved descaler for hard-water regions (Bangalore, Hyderabad, large parts of Maharashtra and Tamil Nadu). Skipping this in a hard-water zone shortens the life of the heating and water-touching parts.
• Run the unit through a working stabilizer. A mainline stabilizer sized for Air Conditioners is the cheapest protection against voltage-induced 00 occurrences. The MCB on your distribution board is not a substitute — it trips on overload, not on under-voltage or surge.
• Decide AMC vs DIY honestly. Compare the DaikinAMC quote against what you have actually spent on service. If your unit is >5 years old and you’ve had two service calls in the last 18 months, an AMC usually pays for itself. Younger units with no service history: DIY plus stabilizer is cheaper.
• Watch monthly for early-warning signs. Unusual noise during a specific cycle phase, water spotting, mild burning smell — any of these means a service call within a week, not a wait-and-see month. Catching 00-precursor symptoms early turns a major repair into a routine maintenance visit.

If error 00 returns within 30 days of completing the fix above, escalate directly to Daikinauthorised service — repeat patterns within a month indicate a deeper fault (worn bearing, failing PCB, leak that wasn’t fully identified) that surface-level repair won’t resolve. Document the dates and circumstances of each occurrence; the service centre will use this to prioritize root-cause investigation.