What causes a hvac blinking lights?

A hvac blinking lights can be caused by blink, flash, LED, light issues. We track 100 error codes across 3 brands related to this symptom.

How do I fix a hvac blinking lights?

There are 200 community-ranked fixes for this symptom across 3 brands. The average fix success rate is 89%. Find your specific error code below for step-by-step instructions.

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HVAC Blinking Lights

Blinking LED lights on your HVAC unit? Decode error blink patterns for Carrier, Lennox, Trane, Goodman, Rheem, and more.

100

Error Codes

Brands

200

DIY Fixes

89%

Avg Success

Mitsubishi

67 codes

All Mitsubishi codes

Installation Error Detected

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Replace Faulty Wiring or Control Board Components

M-NET Communication Line Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 85% success

Test M-NET Communication Bus Wiring and Replace Faulty Components

Initial Startup Not Completed

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Perform Full System Commissioning Including Refrigerant Charge Verification

Indoor-to-Indoor Communication Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Replace Faulty Indoor Unit Communication Board

Main/Sub Remote Controller Communication Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 85% success

Replace Remote Controller Communication Interface Board

Outdoor-to-Outdoor Communication Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 88% success

Replace Outdoor Unit Communication Interface Board

Indoor-to-Outdoor Serial Communication Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Replace Indoor Unit Communication Board

Indoor/Outdoor Unit Communication Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 85% success

Test Signal Wire Voltage and Replace Damaged Wiring or PCB

Inter-Outdoor-Unit Transmission Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Replace Damaged Inter-Unit Communication Wiring

Power Supply Phase / Momentary Power Failure

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Install Dedicated Circuit and Surge Protector

Pipe Temperature Sensor (TC3) Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Replace Pipe Temperature Sensor (TC3)

Sub-Cool Pipe Temperature Sensor Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Replace Sub-Cool Pipe Temperature Sensor (TC2)

Indoor Coil Freeze or Overheating Protection

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 85% success

Inspect and Clean Blower Wheel; Check Fan Motor Operation

Drain Pump Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Replace the Condensate Drain Pump Assembly

Drain Sensor / Float Switch Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Flush and Repair the Drain Line and Replace Float Switch if Needed

Discharge Air Temperature Sensor Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Replace the Discharge Air Temperature Thermistor Sensor

Indoor Pipe/Coil Temperature Sensor Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 88% success

Test and Replace Indoor Coil Temperature Thermistor Sensor

Intake Air Temperature Sensor Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 85% success

Test and Replace Intake Air Temperature Thermistor

Centralized Controller Communication Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Repair M-NET Bus Wiring and Replace Indoor Unit PCB if Needed

Indoor External Thermostat Communication Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 85% success

Test and Replace Thermostat Interface Adapter

Indoor Unit Address Duplication Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 85% success

Replace Indoor Unit PCB to Resolve Address Conflicts

Indoor Vane/Louver Motor Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Replace Vane Motor Assembly

Indoor/Outdoor Serial Communication Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 85% success

Replace Damaged Communication Wiring and Terminals

Indoor Fan Motor Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test Motor Windings and Replace Indoor Fan Motor

Indoor Unit EEPROM Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Reflash or Replace Indoor Unit Control Board

Indoor/Outdoor Communication Error (Legacy)

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Replace Communication Cable or Terminal Blocks

Indoor Unit PCB Processor Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Replace the Indoor Unit PCB Control Board

Remote Controller Communication Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 85% success

Check and Repair Wired Remote Controller Cable Connections

Remote Controller Signal Receiving Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Replace the Indoor Unit IR Receiver Module

Remote Controller PCB Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 85% success

Test and Replace Remote Controller PCB or Communication Cable

Installation Error Detected

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Replace Faulty Wiring or Control Board Components

M-NET Communication Line Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 85% success

Test M-NET Communication Bus Wiring and Replace Faulty Components

Initial Startup Not Completed

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Perform Full System Commissioning Including Refrigerant Charge Verification

Indoor-to-Indoor Communication Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Replace Faulty Indoor Unit Communication Board

Main/Sub Remote Controller Communication Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 85% success

Replace Remote Controller Communication Interface Board

Outdoor-to-Outdoor Communication Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 88% success

Replace Outdoor Unit Communication Interface Board

Indoor-to-Outdoor Serial Communication Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Replace Indoor Unit Communication Board

Indoor/Outdoor Unit Communication Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 85% success

Test Signal Wire Voltage and Replace Damaged Wiring or PCB

Inter-Outdoor-Unit Transmission Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Replace Damaged Inter-Unit Communication Wiring

Power Supply Phase / Momentary Power Failure

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Install Dedicated Circuit and Surge Protector

Pipe Temperature Sensor (TC3) Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Replace Pipe Temperature Sensor (TC3)

Sub-Cool Pipe Temperature Sensor Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Replace Sub-Cool Pipe Temperature Sensor (TC2)

Indoor Coil Freeze or Overheating Protection

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 85% success

Inspect and Clean Blower Wheel; Check Fan Motor Operation

Drain Pump Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Replace the Condensate Drain Pump Assembly

Drain Sensor / Float Switch Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Flush and Repair the Drain Line and Replace Float Switch if Needed

Discharge Air Temperature Sensor Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Replace the Discharge Air Temperature Thermistor Sensor

Indoor Pipe/Coil Temperature Sensor Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 88% success

Test and Replace Indoor Coil Temperature Thermistor Sensor

Intake Air Temperature Sensor Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 85% success

Test and Replace Intake Air Temperature Thermistor

Centralized Controller Communication Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Repair M-NET Bus Wiring and Replace Indoor Unit PCB if Needed

Indoor External Thermostat Communication Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 85% success

Test and Replace Thermostat Interface Adapter

Indoor Unit Address Duplication Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 85% success

Replace Indoor Unit PCB to Resolve Address Conflicts

Indoor Vane/Louver Motor Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Replace Vane Motor Assembly

Indoor/Outdoor Serial Communication Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 85% success

Replace Damaged Communication Wiring and Terminals

Indoor Fan Motor Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test Motor Windings and Replace Indoor Fan Motor

Indoor Unit EEPROM Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Reflash or Replace Indoor Unit Control Board

Indoor/Outdoor Communication Error (Legacy)

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Replace Communication Cable or Terminal Blocks

Indoor Unit PCB Processor Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Replace the Indoor Unit PCB Control Board

Remote Controller Communication Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 85% success

Check and Repair Wired Remote Controller Cable Connections

Remote Controller Signal Receiving Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Replace the Indoor Unit IR Receiver Module

Remote Controller PCB Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 85% success

Test and Replace Remote Controller PCB or Communication Cable

Installation Error Detected

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 90% success

Test and Replace Faulty Wiring or Control Board Components

M-NET Communication Line Error

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 85% success

Test M-NET Communication Bus Wiring and Replace Faulty Components

Initial Startup Not Completed

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 90% success

Perform Full System Commissioning Including Refrigerant Charge Verification

Indoor-to-Indoor Communication Error

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 90% success

Test and Replace Faulty Indoor Unit Communication Board

Main/Sub Remote Controller Communication Error

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 85% success

Replace Remote Controller Communication Interface Board

Outdoor-to-Outdoor Communication Error

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 88% success

Replace Outdoor Unit Communication Interface Board

Indoor-to-Outdoor Serial Communication Error

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 90% success

Test and Replace Indoor Unit Communication Board

Rheem

28 codes

All Rheem codes

FAN MOTOR FAIL

Condenser Fan Motor Failure

❄️ Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner· 2 fixes· 90% success

Replace the Condenser Fan Motor

CAPACITOR FAIL

Run/Start Capacitor Failure

❄️ Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner· 2 fixes· 90% success

Replace the Dual Run Capacitor

SHORT CYCLING

AC Turns On and Off Rapidly

❄️ Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner· 2 fixes· 85% success

Test and Replace the Condenser Fan Motor

NOT STARTING

Outdoor Unit Won't Start

❄️ Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner· 2 fixes· 85% success

Test and Replace Run Capacitor

NOT COOLING

AC Not Cooling — Outdoor Unit Running

❄️ Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner· 2 fixes· 90% success

Diagnose and Repair Refrigerant Leak or Replace Metering Device

INDUCER NOISE

Inducer Motor Noise or Failure

🔥 Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace· 2 fixes· 90% success

Replace Inducer Motor Assembly

NO HEAT

Furnace Not Producing Heat

🔥 Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace· 2 fixes· 85% success

Inspect IFC Board Fuse and Diagnostic Codes

RAPID FLASH

Control Board Failure

🔥 Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace· 2 fixes· 90% success

Replace IFC Control Board

4 FLASH

Pressure Switch Stuck Open

🔥 Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace· 2 fixes· 90% success

Test and Replace Pressure Switch or Inducer Motor

2 FLASH

System Lockout — Ignition Failed

🔥 Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace· 2 fixes· 90% success

Replace Hot Surface Igniter and Clean Flame Sensor

1 FLASH

Normal — Heat Call Active

🔥 Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace· 2 fixes· 90% success

Inspect and Test Furnace Ignition System and Gas Valve

LED ON

Normal Operation — System Idle

🔥 Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace· 2 fixes· 100% success

Confirm Thermostat and System Status

LED OFF

No Power to Control Board

🔥 Rheem R801T 80% AFUE Single-Stage Upflow Gas Furnace· 2 fixes· 90% success

Test and Replace 3-Amp Fuse and 24VAC Transformer

INDUCER NOISE

Inducer Motor Noise or Failure

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 90% success

Replace Inducer Motor Assembly

NOISY OPERATION

Unusual Furnace Noises

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 90% success

Replace Blower Motor Bearings or Igniter Assembly

BLOWER CONTINUOUS

Blower Motor Runs Continuously

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 90% success

Test and Replace IFC Board Fan Relay if Needed

SHORT CYCLE

Furnace Short Cycling — Shuts Off Too Soon

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 85% success

Test and Replace Blower Motor Capacitor or Evaluate Furnace Sizing

NO HEAT

Furnace Not Producing Heat

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 85% success

Inspect IFC Board Fuse and Diagnostic Codes

RAPID FLASH

Control Board Failure / Communication Error

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 90% success

Replace IFC Control Board

11 FLASH

High-Stage Pressure Switch Open (Two-Stage Only)

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 85% success

Test and Replace High-Stage Pressure Switch

8 FLASH

Igniter Circuit Failure

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 90% success

Test and Replace the Hot Surface Igniter

7 FLASH

Low Flame Signal

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 90% success

Test and Replace Flame Sensor Assembly

5 FLASH

Flame Sensed Without Gas Valve Command

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 100% success

Turn Off Gas Supply and Inspect Flame Sensor

4 FLASH

Pressure Switch Stuck Open

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 90% success

Test and Replace Pressure Switch or Inducer Motor

2 FLASH

System Lockout — Ignition Failed

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 90% success

Replace Hot Surface Igniter and Clean Flame Sensor

1 FLASH

Normal — Heat Call Active

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 90% success

Inspect and Test Furnace Ignition System and Gas Valve

LED ON

Normal Operation — System Idle

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 100% success

Confirm Thermostat and System Status

LED OFF

No Power to Control Board

🔥 Rheem R96V 96% AFUE Two-Stage Variable Speed Upflow Gas Furnace· 2 fixes· 90% success

Test and Replace 3-Amp Fuse and 24VAC Transformer

Samsung

5 codes

All Samsung codes

Compressor Start Failure

❄️ Samsung AW06ECB7A 6,000 BTU Window Air Conditioner· 2 fixes· 90% success

Test and Replace the Compressor Start Relay and Capacitor

Outdoor Fan Motor Error

❄️ Samsung AW06ECB7A 6,000 BTU Window Air Conditioner· 2 fixes· 90% success

Replace Outdoor Fan Motor Assembly

Indoor Fan Motor Error

❄️ Samsung AW06ECB7A 6,000 BTU Window Air Conditioner· 2 fixes· 90% success

Replace Indoor Fan Motor Assembly

Condenser Temperature Sensor Error

❄️ Samsung AW06ECB7A 6,000 BTU Window Air Conditioner· 2 fixes· 90% success

Test and Replace the Condenser Temperature Sensor

Evaporator Temperature Sensor Error

❄️ Samsung AW06ECB7A 6,000 BTU Window Air Conditioner· 2 fixes· 90% success

Test and Replace the Evaporator Temperature Sensor

Related Symptoms

❄️AC Not Cooling 🌡️AC Blowing Warm 🧊AC Freezing Up 🔥Furnace Won't Ignite 🔁HVAC Short Cycling 💨Weak Airflow

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