Whirlpool AC Error Codes & Troubleshooting Guide [Finder Tool]

Whirlpool AC showing an error code? Use our error finder tool to see what it means, get troubleshooting steps, and know when to call an AC expert. Free checklist included.

Whirlpool AC error codes appear on your indoor display, or as blinking LED patterns on the outdoor unit, whenever the system detects a malfunction. These alphanumeric codes act as an early warning system, flagging problems before they cause bigger damage.

An error code points to a faulty system, not always the exact broken part. Some causes are simple, like loose wiring or a dirty sensor. Others, like PCB or refrigerant issues, need a trained technician. This guide gives you the full error code table, common causes, safe DIY checks, and clear signs of when to call a professional.

Whirlpool AC Error Code Chart: Meaning & Quick Solutions

Here is a quick-scan chart of all major Whirlpool inverter AC error codes and their fixes.

Error Code	What It Means	Quick Fix / Next Step
UA	Indoor and outdoor unit mismatch	Confirm matching model/capacity, replace mismatched unit
E6	Indoor-outdoor communication failure	Check wiring, power supply, inspect PCB
PL	Outdoor DC voltage too low	Measure DC voltage, repair/replace inverter PCB
PH	Outdoor DC voltage too high	Check DC output, repair/replace inverter PCB
F0 / P0	Refrigerant shortage or blocked flow	Check pressure, inspect for leaks, recharge gas
P7	Indoor temperature sensor fault	Check wiring, measure resistance, replace sensor
F2	Indoor coil/pipe sensor fault	Reconnect sensor, check refrigerant, replace if faulty
F3	Outdoor ambient sensor fault	Clean sensor, check wiring, replace if defective
F4	Outdoor condenser sensor/compressor fault	Check sensor, fan, refrigerant, and compressor
F5	Compressor discharge sensor fault	Clean sensor, check wiring, replace if defective
F6	Outdoor suction temperature sensor fault	Check wiring, measure resistance, replace sensor
F7	Outdoor ambient/condenser coil sensor fault	Check wiring, replace sensor or outdoor PCB
F8	Outdoor ambient sensor fault	Inspect sensor and wiring, replace if defective
F9	Outdoor DC fan motor fault	Check motor, wiring, voltage; replace fan motor
E0	Outdoor PCB fault	Verify power supply, repair/replace outdoor PCB
E1	Indoor fan motor fault	Check blower, wiring, PCB output; replace fan motor
E3	Indoor coil/gas pipe sensor fault	Inspect sensor, measure resistance, replace sensor
E4	Indoor room temperature sensor fault	Check wiring, measure resistance, replace sensor
EE	Indoor PCB fault	Check fan/sensors first, repair/replace indoor PCB
H6	Indoor fan feedback failure	Check fan wiring, replace fan motor or inspect PCB
P5	System overload protection	Check refrigerant, outdoor fan, compressor current
P6	Startup failure	Verify voltage, wiring, and indoor/outdoor PCBs
P8	Four-way/reversing valve fault	Check valve coil, replace valve if faulty

Outdoor LED Blink Codes (No Indoor Display)

For units without a code display, count the LED blink pattern on the outdoor unit.

LED1	LED2	LED3	Fault
X	X	X	Normal operation
★	X	★	Outdoor coil temperature sensor fault
★	X	X	Compressor exhaust temperature sensor fault
X	X	○	Indoor-outdoor communication failure
★	○	X	Current overload protection
★	○	★	Maximum current protection
★	★	★	Outdoor EEPROM fault
X	○	★	Compressor exhaust temperature too high
★	★	X	Outdoor ambient temperature sensor fault
X	★	○	Compressor shell temperature too high
X	○	○	Anti-freeze/overload protection (indoor unit)
○	X	○	Compressor drive fault
○	○	★	Outdoor fan motor locked rotor
X	★	X	Outdoor coil anti-overload protection
X	○	X	IPM module protection
○	X	X	PFC protection
★	★	○	AC voltage higher/lower protection
○	○	X	DC compressor start failure
★	○	○	Outdoor ambient temp too low/high

★ = Light on, ○ = Flashing, X = Off

How to Identify the Error Code on Your Whirlpool AC?

Whirlpool inverter ACs show faults in two ways. Newer models display a direct alphanumeric code on the indoor unit, while others use a blinking LED pattern on the outdoor unit’s PCB. Follow these steps to find yours:

1. Check the indoor unit display first for a direct alphanumeric code, such as E6, F2, PL, or UA.
2. If there is no indoor display code, open the outdoor unit and locate the three LEDs (LED1, LED2, LED3) on the PCB.
3. Note whether each LED is steady ON (★), flashing (○), or OFF (X).
4. Match the ON, OFF, and flashing combination to the LED blink pattern table in the chart above to find the exact fault.
5. Write down the exact code or pattern before power-cycling the unit, since some faults clear on restart and become harder to diagnose later.

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Whirlpool AC Error Codes Explained: Causes and Step-by-Step Fixes?

UA – Setting Error (Indoor & Outdoor Unit Mismatch)

Possible Causes

• The indoor and outdoor units are not the same model or capacity, which prevents them from working together correctly.
• Incorrect pairing happened during the original installation, linking units that were never designed to match.

What to Do

• Verify that both the indoor and outdoor units share the exact same model and capacity rating.
• If a mismatch is confirmed, the incorrect unit will need to be replaced with a matching one.

E6 – Communication Failure

Possible Causes

• The indoor and outdoor units have lost communication with each other, often due to a faulty communication cable.
• One of the two PCBs (indoor or outdoor) may not be receiving power, or the PCB itself may have failed.

What to Do

• Check that both indoor and outdoor PCBs are receiving proper power supply.
• Inspect the communication wiring for loose, broken, or incorrectly connected wires, and measure the communication voltage, which should typically read 13–24 VDC.
• If voltage is missing at the indoor PCB, inspect it directly; if the indoor output is normal but the outdoor unit shows no signal, inspect or replace the outdoor PCB.

Voltage & Power Supply Errors (PL, PH)

PL – DC Input Voltage Too Low

Possible Causes

• The outdoor inverter PCB is failing to supply the correct DC voltage to the system.

What to Do

• Measure the DC voltage coming from the inverter PCB and inspect its output to the compressor and fan motor.
• Repair or replace the outdoor inverter PCB if the voltage reading stays low.

Safety note: voltage-related faults involve the inverter PCB and are not safe for DIY repair. Call a qualified technician.

PH – DC Input Voltage Too High

Possible Causes

• The inverter PCB is supplying excessively high DC voltage to the system.

What to Do

• Check the DC voltage output and inspect the inverter PCB for damage.
• Repair or replace the faulty PCB, since incorrect voltage can damage other components.

Safety note: voltage-related faults involve the inverter PCB and are not safe for DIY repair. Call a qualified technician.

Refrigerant-Related Errors (F0/P0)

F0 (or P0 on some models) – Refrigerant Shortage / Flow Protection

This error signals a refrigerant leak, low gas charge, or blocked refrigerant flow inside the system. Whirlpool ACs trigger this code to protect the compressor from running without proper cooling gas.

Possible Causes

• Refrigerant leakage or a low refrigerant charge.
• A blocked capillary tube or restricted refrigerant piping.

What to Do

1. Check the refrigerant pressure using proper gauges.
2. Inspect the entire system for leaks.
3. Check for any blockage in the capillary tube or copper piping.
4. Flush and vacuum the refrigerant lines before recharging.
5. Recharge the refrigerant strictly to the manufacturer’s specifications.
6. If you are from Kolkata or nearby areas, contact us for a low cost AC gas refilling service.

Safety note: refrigerant handling requires certified tools and training, and should never be attempted as a DIY repair.

Sensor Fault Errors (P7, F2, F3, F4, F5, F6, F7, F8)

Code	Sensor Affected	Common Cause	Fix
P7	Indoor temperature sensor	Faulty sensor, loose connection, or damaged wiring	Check wiring, measure resistance, replace sensor if defective
F2	Indoor coil/pipe sensor	Sensor malfunction or disconnection after servicing	Reconnect sensor, verify position, check refrigerant level
F3	Outdoor ambient sensor	Damaged, dirty, or disconnected sensor	Clean sensor, check wiring, replace if defective
F4	Outdoor condenser sensor / compressor	Sensor fault, compressor overheating, or low refrigerant	Check sensor, fan operation, and refrigerant charge
F5	Compressor discharge sensor	Sensor failure or damaged wiring	Clean sensor, check wiring, replace if defective
F6	Outdoor suction sensor	Suction pipe sensor malfunction	Check wiring, measure resistance, replace faulty sensor
F7	Outdoor ambient/condenser coil sensor	Sensor malfunction (model dependent)	Verify placement, measure resistance, replace sensor
F8	Outdoor ambient sensor	Sensor failure	Inspect sensor and wiring, replace if defective

Most sensor faults can be checked at home by cleaning the sensor and inspecting the wiring for damage. However, resistance testing and sensor replacement need a trained technician to avoid further PCB damage.

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Fan Motor & PCB Errors (E0, E1, E3, E4, EE, H6, F9)

Code	Component Affected	Common Cause	Fix
E0	Outdoor PCB	Outdoor control board malfunction	Verify power supply, repair or replace outdoor PCB
E1	Indoor fan motor	Motor failure or jammed blower	Ensure blower rotates freely, check wiring, replace motor
E3	Indoor coil/gas pipe sensor	Sensor malfunction	Inspect sensor, measure resistance, replace if faulty
E4	Indoor room temperature sensor	Sensor failure	Check wiring, measure resistance, replace sensor
EE	Indoor PCB	PCB unable to communicate or provide output	Verify fan and sensors first, repair or replace indoor PCB
H6	Indoor fan feedback	Fan RPM signal missing	Check fan wiring, replace fan motor or inspect PCB
F9	Outdoor DC fan motor	Fan motor failure	Check motor operation, wiring, and supply voltage

Compressor & System Protection Errors (P5, P6, P8)

P5 – System Overload Protection

Possible Causes

• The compressor is overloaded, or the outdoor fan has stopped operating correctly.
• Low refrigerant, or the PCB is not supplying power to the compressor correctly.

What to Do

• Check the refrigerant charge and verify that the outdoor fan is operating normally.
• Inspect the compressor current and check the inverter PCB outputs for faults.

P6 – Startup Failure

Possible Causes

• The compressor or system fails to start due to a communication issue between units.
• Low mains voltage or a PCB failure can also prevent startup.

What to Do

• Verify the input voltage and check the communication wiring between units.
• Inspect both indoor and outdoor PCBs, and confirm the compressor is receiving proper power supply.

P8 – Four-Way/Reversing Valve Fault

Possible Causes

• The reversing valve is malfunctioning, which is typically noticed while the unit runs in heating mode.

What to Do

• Check the four-way valve coil and verify the valve is operating correctly.
• Replace the faulty valve or coil if testing confirms the fault.

No Indoor Display? How to Read Whirlpool Outdoor Unit LED Error Codes

Some Whirlpool AC models don’t show an alphanumeric code on the indoor display. Instead, they use three LEDs on the outdoor unit’s PCB to signal a fault.

LED Status Legend

• ★ = Steady ON
• ○ = Flashing
• X = OFF

How to Use This Method?

1. Open the outdoor unit and observe the three LEDs (LED1, LED2, LED3) on the PCB.
2. Note the exact status of each LED: ON, OFF, or flashing.
3. Match the pattern to the LED blink code table in Section 3 to identify the fault.

Worked Examples

• LED1 = ★, LED2 = X, LED3 = ★ → Outdoor coil temperature sensor fault
• LED1 = X, LED2 = X, LED3 = ○ → Indoor-outdoor communication failure
• LED1 = ★, LED2 = ○, LED3 = X → Current overload protection
• LED1 = ○, LED2 = ○, LED3 = ★ → Outdoor fan motor locked rotor protection

LED patterns can vary slightly by model or PCB revision, so cross-check with the sticker on the outdoor unit’s PCB cover if available.

Which Whirlpool AC Errors Can You Fix Yourself?

Use this quick checklist to decide if your Whirlpool AC error needs a DIY check or a professional visit.

You Can Try Yourself	Call a Professional
Power-cycle the unit for 5–10 minutes, then restart	PCB replacement or repair (indoor or outdoor)
Check remote batteries and settings	Refrigerant leak detection, flushing, or recharging
Clean visible dust from sensors	Compressor or fan motor replacement
Check for loose external wiring (only with power OFF)	Voltage or inverter PCB faults (PL, PH)
	Communication wiring faults inside the unit
	Four-way valve replacement

Final Thoughts

Whirlpool AC error codes are a fast diagnostic tool, not just an annoying beep. Understanding them saves you time and unnecessary repair costs.

Simple issues like loose wiring, dirty sensors, or low remote batteries can often be checked safely at home. PCB, refrigerant, and compressor faults always need certified help. Note down the exact code or LED pattern, then contact Urban Service Plaza for fast, doorstep AC diagnosis in Kolkata.