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Mitsubishi Electric Mini-Split Error Codes

Mitsubishi Electric ductless units show a code such as E6, P8 or U2 on the remote controller, and wall units also blink the OPERATION lamp a set number of times. Below are 34 Mitsubishi Electric codes across 2 model series. Each one says what it means, which series it applies to, what you can safely check, and when to call a licensed pro, with a link to the Mitsubishi Electric document it comes from.

The same code can mean different things on different series, so match the series column to your unit. Your unit's manual is the final word. Reviewed October 2026.

🔎 Enter the code, blink count or model shown on your unit

34 codes

All Mitsubishi Electric error codes

Code	Meaning	Applies to	Safety
P1 Wireless remote: the OPERATION INDICATOR lamp flashes 1 times in a self-check; wired remote shows the code	Intake (room) sensor error	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🧭 Check first
P2 Wireless remote: the OPERATION INDICATOR lamp flashes 2 times in a self-check; wired remote shows the code	Pipe (liquid) sensor error	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🧭 Check first
P9 Wireless remote: the OPERATION INDICATOR lamp flashes 2 times in a self-check; wired remote shows the code	Pipe (condenser/evaporator) sensor error	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🧭 Check first
E6 Wireless remote: the OPERATION INDICATOR lamp flashes 3 times in a self-check; wired remote shows the code	Indoor/outdoor unit communication error	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🧭 Check first
P4 Wireless remote: the OPERATION INDICATOR lamp flashes 4 times in a self-check; wired remote shows the code	Float switch connector open	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
P5 Wireless remote: the OPERATION INDICATOR lamp flashes 5 times in a self-check; wired remote shows the code	Drain pump error (water leakage abnormality)	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🧭 Check first
PA Wireless remote: the OPERATION INDICATOR lamp flashes 5 times in a self-check; wired remote shows the code	Forced compressor stop	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
P6 Wireless remote: the OPERATION INDICATOR lamp flashes 6 times in a self-check; wired remote shows the code	Freezing or overheating protection operation	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🧭 Check first
EE Wireless remote: the OPERATION INDICATOR lamp flashes 7 times in a self-check; wired remote shows the code	Communication error between indoor and outdoor units	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🧭 Check first
P8 Wireless remote: the OPERATION INDICATOR lamp flashes 8 times in a self-check; wired remote shows the code	Pipe temperature error	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
E4 Wireless remote: the OPERATION INDICATOR lamp flashes 9 times in a self-check; wired remote shows the code	Remote controller signal receiving error	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🧭 Check first
Fb Wireless remote: the OPERATION INDICATOR lamp flashes 12 times in a self-check; wired remote shows the code	Indoor unit control system error	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
PL Wireless remote: the OPERATION INDICATOR lamp flashes 13 times in a self-check; wired remote shows the code	Refrigerant circuit abnormal	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
E1 Shown on the remote controller (no fixed flash count in the table)	Remote controller control board error	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🧭 Check first
E0 Shown on the remote controller (no fixed flash count in the table)	Remote controller transmission error	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🧭 Check first
E9 Wireless remote: second self-check pattern (errors found by the outdoor unit), 1 flash; wired remote shows E9	Indoor/outdoor communication error (transmitting)	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🧭 Check first
UP Second self-check pattern, 2 flashes	Compressor overcurrent interruption	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
U3 Second self-check pattern, 3 flashes	Outdoor unit thermistor open or short	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
UF Second self-check pattern, 4 flashes	Compressor overcurrent (compressor locked)	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
U2 Second self-check pattern, 5 flashes	High discharge temperature or insufficient refrigerant	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
U1 Second self-check pattern, 6 flashes	Abnormal high pressure or overheating protection	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
U5 Second self-check pattern, 7 flashes	Abnormal heat sink temperature	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
U8 Second self-check pattern, 8 flashes	Outdoor unit fan protection stop	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
U6 Second self-check pattern, 9 flashes	Compressor overcurrent or power module abnormal	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
U7 Second self-check pattern, 10 flashes	Superheat abnormality (low discharge temperature)	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
U9 Second self-check pattern, 11 flashes	Overvoltage, voltage shortage or current sensor error	PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)	🛑 Call a pro
Lamp blinks 0.5 s on/off Left OPERATION INDICATOR lamp blinks ON and OFF at 0.5-second intervals	Miswiring or serial signal error	MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual)	🧭 Check first
2 blinks Left OPERATION INDICATOR lamp blinks 2 times, then 2.5-second pause	Indoor coil or room temperature thermistor error	MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual)	🧭 Check first
3 blinks Left OPERATION INDICATOR lamp blinks 3 times, then 2.5-second pause	Indoor fan motor error	MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual)	🧭 Check first
4 blinks Left OPERATION INDICATOR lamp blinks 4 times, then 2.5-second pause	Indoor control system error	MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual)	🛑 Call a pro
5 blinks Left OPERATION INDICATOR lamp blinks 5 times, then 2.5-second pause	Outdoor power system abnormality	MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual)	🛑 Call a pro
6 blinks Left OPERATION INDICATOR lamp blinks 6 times, then 2.5-second pause	Outdoor thermistor error	MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual)	🛑 Call a pro
7 blinks Left OPERATION INDICATOR lamp blinks 7 times, then 2.5-second pause	Outdoor control system error	MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual)	🛑 Call a pro
14 or more blinks Left OPERATION INDICATOR lamp blinks 14 times or more	Other abnormality	MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual)	🛑 Call a pro

✅ Usually fine to keep running · 🧭 Check a few things first · 🛑 Turn it off and call a licensed pro

Find your Mitsubishi Electric model series

The codes Mitsubishi Electric documents for each series we have checked. If your series is not listed, the code may mean something different on your unit, so check its manual.

MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual)

Lamp blinks 0.5 s on/off 2 blinks 3 blinks 4 blinks 5 blinks 6 blinks 7 blinks 14 or more blinks

PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual)

P1 P2 P9 E6 P4 P5 PA P6 EE P8 E4 Fb PL E1 E0 E9 UP U3 UF U2 U1 U5 U8 U6 U7 U9

More Mitsubishi Electric codes

Mitsubishi Electric P1: Intake (room) sensor error

🧭 Check a few things first

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Wireless remote: the OPERATION INDICATOR lamp flashes 1 times in a self-check; wired remote shows the code

The indoor unit reports an error with the intake air (room temperature) sensor.

When to call a pro: If P1 comes back after a power reset, a technician needs to check the sensor and its connector.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric P2: Pipe (liquid) sensor error

🧭 Check a few things first

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Wireless remote: the OPERATION INDICATOR lamp flashes 2 times in a self-check; wired remote shows the code

The indoor unit reports an error with the pipe (TH2) temperature sensor.

When to call a pro: If it returns after a power reset, a technician needs to test the sensor and wiring.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric P9: Pipe (condenser/evaporator) sensor error

🧭 Check a few things first

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Wireless remote: the OPERATION INDICATOR lamp flashes 2 times in a self-check; wired remote shows the code

The indoor unit reports an error with the pipe (TH5) temperature sensor. It shares the 2-flash pattern with P2.

When to call a pro: If it returns after a power reset, a technician needs to test the sensor and wiring.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric P4: Float switch connector open

🛑 Turn it off and call a licensed pro

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Wireless remote: the OPERATION INDICATOR lamp flashes 4 times in a self-check; wired remote shows the code

The indoor unit reports that the float switch connector is open.

When to call a pro: Turn the unit off and call a technician. The float switch is part of the condensate protection inside the unit.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric PA: Forced compressor stop

🛑 Turn it off and call a licensed pro

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Wireless remote: the OPERATION INDICATOR lamp flashes 5 times in a self-check; wired remote shows the code

The indoor unit reports a forced compressor stop. It shares the 5-flash pattern with P5.

When to call a pro: Turn the unit off and call a licensed technician.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric EE: Communication error between indoor and outdoor units

🧭 Check a few things first

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Wireless remote: the OPERATION INDICATOR lamp flashes 7 times in a self-check; wired remote shows the code

The indoor unit reports a communication error between the indoor and outdoor units.

When to call a pro: If it returns, a technician needs to check the connecting wiring and control boards.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric E4: Remote controller signal receiving error

🧭 Check a few things first

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Wireless remote: the OPERATION INDICATOR lamp flashes 9 times in a self-check; wired remote shows the code

The indoor unit reports an error receiving the remote controller signal. The manual lists E4 and E5 together.

When to call a pro: If it returns, a technician needs to check the remote controller and indoor board.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric Fb: Indoor unit control system error

🛑 Turn it off and call a licensed pro

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Wireless remote: the OPERATION INDICATOR lamp flashes 12 times in a self-check; wired remote shows the code

The indoor unit reports a control system error such as a memory error. A PAR-30MAA remote shows it as FB.

When to call a pro: The indoor control board likely needs service. Call a licensed technician.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric PL: Refrigerant circuit abnormal

🛑 Turn it off and call a licensed pro

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Wireless remote: the OPERATION INDICATOR lamp flashes 13 times in a self-check; wired remote shows the code

The indoor unit reports an abnormal refrigerant circuit.

When to call a pro: Turn the unit off and call a licensed technician. Refrigerant must only be handled by a technician.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric E1: Remote controller control board error

🧭 Check a few things first

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Shown on the remote controller (no fixed flash count in the table)

The remote controller reports a control board error. The manual lists E1 and E2 together.

When to call a pro: If it returns, the remote controller or its board needs replacing by a technician.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric E0: Remote controller transmission error

🧭 Check a few things first

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Shown on the remote controller (no fixed flash count in the table)

The remote controller reports a transmission error. The manual lists E0 and E3 together.

When to call a pro: If it returns, a technician needs to check the remote controller wiring.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric UP: Compressor overcurrent interruption

🛑 Turn it off and call a licensed pro

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Second self-check pattern, 2 flashes

The outdoor side reports a compressor overcurrent interruption.

When to call a pro: Have a licensed HVAC technician diagnose and repair it. The service manual treats this as a service repair.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric U3: Outdoor unit thermistor open or short

🛑 Turn it off and call a licensed pro

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Second self-check pattern, 3 flashes

The outdoor side reports an open or short in the outdoor unit thermistors. The manual lists U3 and U4 together.

When to call a pro: Have a licensed HVAC technician diagnose and repair it. The service manual treats this as a service repair.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric UF: Compressor overcurrent (compressor locked)

🛑 Turn it off and call a licensed pro

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Second self-check pattern, 4 flashes

The outdoor side reports compressor overcurrent interruption when the compressor is locked.

When to call a pro: Have a licensed HVAC technician diagnose and repair it. The service manual treats this as a service repair.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric U5: Abnormal heat sink temperature

🛑 Turn it off and call a licensed pro

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Second self-check pattern, 7 flashes

The outdoor side reports an abnormal temperature of the heat sink.

When to call a pro: Have a licensed HVAC technician diagnose and repair it. The service manual treats this as a service repair.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric U8: Outdoor unit fan protection stop

🛑 Turn it off and call a licensed pro

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Second self-check pattern, 8 flashes

The outdoor side reports an outdoor unit fan protection stop.

When to call a pro: Have a licensed HVAC technician diagnose and repair it. The service manual treats this as a service repair.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric U6: Compressor overcurrent or power module abnormal

🛑 Turn it off and call a licensed pro

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Second self-check pattern, 9 flashes

The outdoor side reports compressor overcurrent interruption or an abnormal power module.

When to call a pro: Have a licensed HVAC technician diagnose and repair it. The service manual treats this as a service repair.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric U7: Superheat abnormality (low discharge temperature)

🛑 Turn it off and call a licensed pro

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Second self-check pattern, 10 flashes

The outdoor side reports an abnormality of superheat due to low discharge temperature.

When to call a pro: Have a licensed HVAC technician diagnose and repair it. The service manual treats this as a service repair.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric U9: Overvoltage, voltage shortage or current sensor error

🛑 Turn it off and call a licensed pro

Applies to: PLA-RP35/50/60/71/100/125/140BA ceiling cassette indoor units (Mr. Slim, OCH416 service manual). Shows as: Second self-check pattern, 11 flashes

The outdoor side reports an abnormality such as overvoltage or voltage shortage, an abnormal synchronous signal to the main circuit, or a current sensor error. The manual lists U9 and UH together.

When to call a pro: Have a licensed HVAC technician diagnose and repair it. The service manual treats this as a service repair.

Source: Mitsubishi Electric PLA-RP BA Service Manual OCH416 Rev. D, p.22

Mitsubishi Electric 2 blinks: Indoor coil or room temperature thermistor error

🧭 Check a few things first

Applies to: MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual). Shows as: Left OPERATION INDICATOR lamp blinks 2 times, then 2.5-second pause

The indoor coil or the room temperature thermistor is short or open circuit.

When to call a pro: If it returns, a technician needs to check the thermistors.

Source: Mitsubishi Electric MSZ-AP15/20VG Indoor Service Manual OBH838, p.22 (10-4 Troubleshooting check table)

Mitsubishi Electric 4 blinks: Indoor control system error

🛑 Turn it off and call a licensed pro

Applies to: MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual). Shows as: Left OPERATION INDICATOR lamp blinks 4 times, then 2.5-second pause

The indoor unit cannot properly read data in the nonvolatile memory of the indoor electronic control P.C. board.

When to call a pro: The manual says to replace the indoor control board. Call a licensed technician.

Source: Mitsubishi Electric MSZ-AP15/20VG Indoor Service Manual OBH838, p.22 (10-4 Troubleshooting check table)

Mitsubishi Electric 6 blinks: Outdoor thermistor error

🛑 Turn it off and call a licensed pro

Applies to: MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual). Shows as: Left OPERATION INDICATOR lamp blinks 6 times, then 2.5-second pause

The outdoor thermistors are short or open circuit during compressor operation.

When to call a pro: Call a licensed technician to check the outdoor thermistors.

Source: Mitsubishi Electric MSZ-AP15/20VG Indoor Service Manual OBH838, p.22 (10-4 Troubleshooting check table)

Mitsubishi Electric 7 blinks: Outdoor control system error

🛑 Turn it off and call a licensed pro

Applies to: MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual). Shows as: Left OPERATION INDICATOR lamp blinks 7 times, then 2.5-second pause

The outdoor unit cannot properly read data in the nonvolatile memory of its inverter or control P.C. board.

When to call a pro: The manual says to replace the inverter or control board. Call a licensed technician.

Source: Mitsubishi Electric MSZ-AP15/20VG Indoor Service Manual OBH838, p.22 (10-4 Troubleshooting check table)

Mitsubishi Electric 14 or more blinks: Other abnormality

🛑 Turn it off and call a licensed pro

Applies to: MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual). Shows as: Left OPERATION INDICATOR lamp blinks 14 times or more

An abnormality other than those listed is detected. The manual lists checking the stop valve and the 4-way valve.

When to call a pro: Call a licensed technician to read the detailed outdoor unit failure recall.

Source: Mitsubishi Electric MSZ-AP15/20VG Indoor Service Manual OBH838, p.22 (10-4 Troubleshooting check table)

Safe first steps for any code

Write down the exact code and how it shows (remote display or number of lamp blinks). Similar codes mean different things on different series.
Turn the system off at the remote, switch off the breaker or disconnect for the unit, wait a few minutes, then turn it back on.
Clean or replace the indoor unit air filters, and make sure nothing blocks the indoor or outdoor unit.
Check that the condensate drain line is not blocked or kinked where you can see it.
Replace the remote controller batteries if the display is dim or the unit does not respond.

🛑 Stop and call a licensed pro if

Any code pointing to refrigerant, the compressor, high pressure or the outdoor unit board. Refrigerant work legally needs a certified technician.
Burning smell, sparks, or a breaker that trips again after a reset.
Water leaking from the indoor unit that does not stop after the drain is clear.

Shaun Cain · Certified HVAC & Refrigeration Technician · Ask an HVAC technician

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