Payne
Payne Smart Thermostats Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E0
Thermostat display shows E0 and will not communicate with the indoor unit or outdoor unit; system does not respond to mode or temperature changes.
Communication Bus Failure
E1
Thermostat displays E1 and system will not run in heating or cooling; may show indoor temperature as -- or very high/low.
Indoor Temperature Sensor Open/Short
E2
Thermostat shows E2 and may lock out cooling operation; outdoor temperature reading is missing or incorrect if displayed.
Outdoor Temperature Sensor Fault
E3
Thermostat displays E3 and may disable heating; auxiliary or backup heat may not engage correctly.
Auxiliary Heat Sensor or Circuit Fault
E4
Thermostat shows E4 and cooling or heating stages do not energize correctly; may indicate a shorted output.
Output Stage Short or Overcurrent
E5
Thermostat displays E5 and backlight may dim or flicker; system may intermittently reboot or shut down.
Low Voltage / Power Supply Fault
E6
Thermostat shows E6 and Wi‑Fi or app connectivity is disabled; local HVAC control may still function.
Wi‑Fi Module Failure or Network Error
E7
Thermostat displays E7 and may not recognize the connected HVAC equipment type; some modes may be unavailable.
Equipment Configuration Error
E8
Thermostat shows E8 and may shut down heating or cooling due to detected high internal temperature.
Thermostat Overheat Protection
E9
Thermostat displays E9 and may not respond to touch or button presses reliably.
User Interface / Touchscreen Failure
F1
Thermostat shows F1 and indicates a fan control fault; indoor blower may not run or may run continuously.
Indoor Fan Control Circuit Error
F2
Thermostat displays F2 and may disable compressor operation; cooling or heating (for heat pump) will not start.
Compressor Control Fault
F3
Thermostat shows F3 and indicates a dehumidification or humidity sensor fault; humidity readings may be inaccurate or blank.
Indoor Humidity Sensor Failure
F4
Thermostat displays F4 and may disable remote access or advanced smart features while basic temperature control still works.
Cloud / Server Communication Error
F5
Thermostat shows F5 and schedules or learned behaviors do not operate; device may revert to default temperature settings.
Internal Memory / Schedule Storage Error
H1
Thermostat displays H1 and indicates high indoor temperature beyond normal operating range; system may run continuously or shut down on safety.
High Temperature Limit at Thermostat
H2
Thermostat shows H2 and indicates low indoor temperature beyond normal range; heating may run continuously or lock out.
Low Temperature Limit at Thermostat
L1
Thermostat displays L1 and indicates low battery or backup power fault (for models with internal battery).
Internal Backup Battery Failure
L2
Thermostat shows L2 and indicates a C‑wire or common power fault; device may be running on battery only (if equipped) or may reboot frequently.
Common Wire / Power Reference Loss
W1
Thermostat displays W1 and indicates a first‑stage heat call fault; furnace may not start or may short‑cycle.
First‑Stage Heat Call Error
W2
Thermostat shows W2 and second‑stage heat does not engage; home may struggle to reach setpoint in very cold weather.
Second‑Stage Heat Call Error
Symptom
Thermostat backlight flickers or display brightness changes unexpectedly.
Display Power Regulation Issue
Symptom
Thermostat calls for cooling but only the indoor blower runs; outdoor Payne condenser does not start.
Outdoor Unit Not Energized
Symptom
Thermostat calls for heat but furnace does not start; no error code on thermostat, but furnace may show its own fault code.
Heating Equipment Lockout or Ignition Failure
Symptom
Thermostat clicks or relays chatter rapidly when calling for heat or cool; equipment may short‑cycle.
Unstable Control Signal / Relay Chatter
Symptom
Thermostat display is completely blank and unresponsive; HVAC system does not run.
No Power to Thermostat
Symptom
Thermostat display is on but does not respond to touch or button presses; temperature and mode cannot be changed.
Frozen User Interface
Symptom
Thermostat does not detect or control whole‑home dehumidifier or over‑cooling dehumidification feature.
Dehumidification Control Fault
Symptom
Thermostat does not detect or control whole‑home humidifier connected to Payne system.
Humidifier Control Wiring / Configuration Fault
Symptom
Thermostat does not follow programmed schedule; remains at one temperature all day.
Schedule Configuration or Software Fault
Symptom
Thermostat emits a burning smell or feels unusually hot to the touch.
Thermostat Overheating / Component Failure
Symptom
Thermostat fan setting does not work as expected; fan runs continuously even when set to AUTO, or never runs in ON mode.
Fan Control Misconfiguration or Wiring Fault
Symptom
Thermostat frequently overshoots or undershoots the set temperature; room feels too hot or too cold compared to the setpoint.
Poor Temperature Control / Calibration Error
Symptom
Thermostat loses time, date, or schedule settings after a power outage.
Backup Power / Memory Retention Failure
Symptom
Thermostat randomly reboots or restarts several times a day.
Intermittent Power or Firmware Instability
Symptom
Thermostat shows incorrect outdoor temperature or does not display it even though an outdoor sensor is installed.
Outdoor Sensor Misread / Configuration Error
Symptom
Thermostat shows normal operation but HVAC system does not turn on in any mode (heat, cool, or fan).
Control Signal Not Reaching Equipment
Symptom
Thermostat shows Wi‑Fi connected but mobile app cannot control or see the thermostat.
Local Network / App Pairing Issue
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E0 |
Thermostat display shows E0 and will not communicate with the indoor unit or outdoor unit; system does not respond to mode or temperature changes.
|
Communication Bus Failure | View Details |
| E1 |
Thermostat displays E1 and system will not run in heating or cooling; may show indoor temperature as -- or very high/low.
|
Indoor Temperature Sensor Open/Short | View Details |
| E2 |
Thermostat shows E2 and may lock out cooling operation; outdoor temperature reading is missing or incorrect if displayed.
|
Outdoor Temperature Sensor Fault | View Details |
| E3 |
Thermostat displays E3 and may disable heating; auxiliary or backup heat may not engage correctly.
|
Auxiliary Heat Sensor or Circuit Fault | View Details |
| E4 |
Thermostat shows E4 and cooling or heating stages do not energize correctly; may indicate a shorted output.
|
Output Stage Short or Overcurrent | View Details |
| E5 |
Thermostat displays E5 and backlight may dim or flicker; system may intermittently reboot or shut down.
|
Low Voltage / Power Supply Fault | View Details |
| E6 |
Thermostat shows E6 and Wi‑Fi or app connectivity is disabled; local HVAC control may still function.
|
Wi‑Fi Module Failure or Network Error | View Details |
| E7 |
Thermostat displays E7 and may not recognize the connected HVAC equipment type; some modes may be unavailable.
|
Equipment Configuration Error | View Details |
| E8 |
Thermostat shows E8 and may shut down heating or cooling due to detected high internal temperature.
|
Thermostat Overheat Protection | View Details |
| E9 |
Thermostat displays E9 and may not respond to touch or button presses reliably.
|
User Interface / Touchscreen Failure | View Details |
| F1 |
Thermostat shows F1 and indicates a fan control fault; indoor blower may not run or may run continuously.
|
Indoor Fan Control Circuit Error | View Details |
| F2 |
Thermostat displays F2 and may disable compressor operation; cooling or heating (for heat pump) will not start.
|
Compressor Control Fault | View Details |
| F3 |
Thermostat shows F3 and indicates a dehumidification or humidity sensor fault; humidity readings may be inaccurate or blank.
|
Indoor Humidity Sensor Failure | View Details |
| F4 |
Thermostat displays F4 and may disable remote access or advanced smart features while basic temperature control still works.
|
Cloud / Server Communication Error | View Details |
| F5 |
Thermostat shows F5 and schedules or learned behaviors do not operate; device may revert to default temperature settings.
|
Internal Memory / Schedule Storage Error | View Details |
| H1 |
Thermostat displays H1 and indicates high indoor temperature beyond normal operating range; system may run continuously or shut down on safety.
|
High Temperature Limit at Thermostat | View Details |
| H2 |
Thermostat shows H2 and indicates low indoor temperature beyond normal range; heating may run continuously or lock out.
|
Low Temperature Limit at Thermostat | View Details |
| L1 |
Thermostat displays L1 and indicates low battery or backup power fault (for models with internal battery).
|
Internal Backup Battery Failure | View Details |
| L2 |
Thermostat shows L2 and indicates a C‑wire or common power fault; device may be running on battery only (if equipped) or may reboot frequently.
|
Common Wire / Power Reference Loss | View Details |
| W1 |
Thermostat displays W1 and indicates a first‑stage heat call fault; furnace may not start or may short‑cycle.
|
First‑Stage Heat Call Error | View Details |
| W2 |
Thermostat shows W2 and second‑stage heat does not engage; home may struggle to reach setpoint in very cold weather.
|
Second‑Stage Heat Call Error | View Details |
| – |
Thermostat backlight flickers or display brightness changes unexpectedly.
|
Display Power Regulation Issue | View Details |
| – |
Thermostat calls for cooling but only the indoor blower runs; outdoor Payne condenser does not start.
|
Outdoor Unit Not Energized | View Details |
| – |
Thermostat calls for heat but furnace does not start; no error code on thermostat, but furnace may show its own fault code.
|
Heating Equipment Lockout or Ignition Failure | View Details |
| – |
Thermostat clicks or relays chatter rapidly when calling for heat or cool; equipment may short‑cycle.
|
Unstable Control Signal / Relay Chatter | View Details |
| – |
Thermostat display is completely blank and unresponsive; HVAC system does not run.
|
No Power to Thermostat | View Details |
| – |
Thermostat display is on but does not respond to touch or button presses; temperature and mode cannot be changed.
|
Frozen User Interface | View Details |
| – |
Thermostat does not detect or control whole‑home dehumidifier or over‑cooling dehumidification feature.
|
Dehumidification Control Fault | View Details |
| – |
Thermostat does not detect or control whole‑home humidifier connected to Payne system.
|
Humidifier Control Wiring / Configuration Fault | View Details |
| – |
Thermostat does not follow programmed schedule; remains at one temperature all day.
|
Schedule Configuration or Software Fault | View Details |
| – |
Thermostat emits a burning smell or feels unusually hot to the touch.
|
Thermostat Overheating / Component Failure | View Details |
| – |
Thermostat fan setting does not work as expected; fan runs continuously even when set to AUTO, or never runs in ON mode.
|
Fan Control Misconfiguration or Wiring Fault | View Details |
| – |
Thermostat frequently overshoots or undershoots the set temperature; room feels too hot or too cold compared to the setpoint.
|
Poor Temperature Control / Calibration Error | View Details |
| – |
Thermostat loses time, date, or schedule settings after a power outage.
|
Backup Power / Memory Retention Failure | View Details |
| – |
Thermostat randomly reboots or restarts several times a day.
|
Intermittent Power or Firmware Instability | View Details |
| – |
Thermostat shows incorrect outdoor temperature or does not display it even though an outdoor sensor is installed.
|
Outdoor Sensor Misread / Configuration Error | View Details |
| – |
Thermostat shows normal operation but HVAC system does not turn on in any mode (heat, cool, or fan).
|
Control Signal Not Reaching Equipment | View Details |
| – |
Thermostat shows Wi‑Fi connected but mobile app cannot control or see the thermostat.
|
Local Network / App Pairing Issue | View Details |
No matching codes found
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