Salus
Salus 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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E1
Thermostat display shows E1 and will not control heating; set temperature changes have no effect.
Room Temperature Sensor Fault
E2
Thermostat shows E2 and heating does not respond correctly; temperature reading may be frozen or unrealistic.
Floor / External Sensor Fault
E3
Thermostat displays E3 and heating output is disabled or erratic; may occur on models with multiple sensors (room + floor).
Sensor Range / Calibration Error
E4
Thermostat shows E4 and will not operate heating; may be accompanied by blank or flickering temperature display.
Internal Power Supply / Voltage Fault
E5
Thermostat displays E5 and fails to control heating; may occur after a power surge or wiring change.
Relay / Output Driver Fault
E6
Thermostat shows E6 and cannot complete normal operation; may be accompanied by frozen screen or unresponsive buttons.
Firmware / Internal Memory Error
E7
Thermostat displays E7 and may shut down or refuse to operate; often associated with high ambient temperature or poor ventilation.
Overtemperature Protection / Internal Overheat
E8
Thermostat shows E8 and cannot communicate with associated devices or complete setup.
Internal Communication Bus Error
E9
Thermostat displays E9 and refuses to operate; may occur after incorrect wiring or short circuit.
Hardware Protection / Short-Circuit Detected
ERR
Thermostat shows generic 'ERR' on the display and does not follow programmed schedule.
General Configuration / Internal Error
FLOOR HI
Thermostat shows 'FLOOR HI' or similar warning and shuts off heating in underfloor mode.
Floor Temperature High Limit Exceeded
FLOOR LO
Thermostat shows 'FLOOR LO' or similar and may prevent heating from starting in floor-protection mode.
Floor Temperature Low / Sensor Under-range
GATEWAY
Thermostat shows 'GATEWAY' or similar error; cannot connect to Salus Smart Home system even though Wi-Fi is working.
Gateway Association / Registration Error
LOW BAT
Thermostat displays 'LOW BAT', battery icon, or flashes a battery symbol; heating may become intermittent or RF range reduced.
Low Battery Voltage
NO LINK
Smart thermostat app or display shows 'NO LINK' or link icon flashing; system cannot connect to Salus gateway or internet.
Gateway / Cloud Connectivity Loss
RF
Thermostat shows RF error icon or 'RF' message; heating does not respond because the thermostat cannot communicate with the receiver.
Radio Frequency Communication Loss
WIFI
Thermostat or app shows 'WIFI' error or Wi-Fi icon flashing; remote control via app not available.
Wi-Fi Connection Fault
Symptom
Battery-powered Salus thermostat will not turn on; screen remains off even with new batteries.
Battery Power / Internal Fault
Symptom
Heating does not turn on even though the thermostat is calling for heat (flame icon or 'ON' shown).
No Heat Output from Thermostat to Boiler
Symptom
Heating stays on constantly and does not turn off even when the thermostat is satisfied or turned down.
Stuck Relay / Permanent Call for Heat
Symptom
Thermostat backlight flickers or the display intermittently dims and brightens.
Unstable Internal Power / Backlight Driver Issue
Symptom
Thermostat cannot be added to the Salus app; pairing fails repeatedly.
Smart Registration / Pairing Failure
Symptom
Thermostat display completely blank; heating does not respond.
No Power to Thermostat
Symptom
Thermostat display is on but buttons or touchscreen are unresponsive.
Keypad / Touch Interface Failure
Symptom
Thermostat emits a burning smell or shows visible scorch marks.
Overheating / Component Failure
Symptom
Thermostat frequently loses connection to receiver; heating cuts in and out unpredictably.
Intermittent RF Communication
Symptom
Thermostat frequently overshoots the set temperature, making the room too warm.
Poor Temperature Control / Overshoot
Symptom
Thermostat frequently undershoots the set temperature; room never reaches the desired warmth.
Poor Temperature Control / Undershoot
Symptom
Thermostat makes loud clicking or buzzing noises when switching.
Mechanical Relay Noise / Coil Chatter
Symptom
Thermostat or receiver enclosure vibrates or hums when heating is on.
Mechanical Vibration / Mounting Issue
Symptom
Thermostat plastic housing becomes noticeably warm to the touch during normal operation.
Excessive Internal Heat Generation
Symptom
Thermostat randomly resets or restarts, losing time or settings.
Intermittent Power / Internal Reset
Symptom
Thermostat schedule does not follow programmed times; heating turns on/off at wrong times.
Clock / Schedule Misconfiguration
Symptom
Thermostat shows a temperature that is clearly incorrect (e.g. 5°C or 40°C in a normal room).
Room Sensor Misreading / Calibration Drift
Symptom
Thermostat shows Wi-Fi connected but app commands are delayed or not executed.
Cloud / Server Communication Latency
Symptom
Underfloor heating zones controlled by Salus manifold controller do not heat, even though thermostat calls for heat.
Zone Actuator / Manifold Control Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Thermostat display shows E1 and will not control heating; set temperature changes have no effect.
|
Room Temperature Sensor Fault | View Details |
| E2 |
Thermostat shows E2 and heating does not respond correctly; temperature reading may be frozen or unrealistic.
|
Floor / External Sensor Fault | View Details |
| E3 |
Thermostat displays E3 and heating output is disabled or erratic; may occur on models with multiple sensors (room + floor).
|
Sensor Range / Calibration Error | View Details |
| E4 |
Thermostat shows E4 and will not operate heating; may be accompanied by blank or flickering temperature display.
|
Internal Power Supply / Voltage Fault | View Details |
| E5 |
Thermostat displays E5 and fails to control heating; may occur after a power surge or wiring change.
|
Relay / Output Driver Fault | View Details |
| E6 |
Thermostat shows E6 and cannot complete normal operation; may be accompanied by frozen screen or unresponsive buttons.
|
Firmware / Internal Memory Error | View Details |
| E7 |
Thermostat displays E7 and may shut down or refuse to operate; often associated with high ambient temperature or poor ventilation.
|
Overtemperature Protection / Internal Overheat | View Details |
| E8 |
Thermostat shows E8 and cannot communicate with associated devices or complete setup.
|
Internal Communication Bus Error | View Details |
| E9 |
Thermostat displays E9 and refuses to operate; may occur after incorrect wiring or short circuit.
|
Hardware Protection / Short-Circuit Detected | View Details |
| ERR |
Thermostat shows generic 'ERR' on the display and does not follow programmed schedule.
|
General Configuration / Internal Error | View Details |
| FLOOR HI |
Thermostat shows 'FLOOR HI' or similar warning and shuts off heating in underfloor mode.
|
Floor Temperature High Limit Exceeded | View Details |
| FLOOR LO |
Thermostat shows 'FLOOR LO' or similar and may prevent heating from starting in floor-protection mode.
|
Floor Temperature Low / Sensor Under-range | View Details |
| GATEWAY |
Thermostat shows 'GATEWAY' or similar error; cannot connect to Salus Smart Home system even though Wi-Fi is working.
|
Gateway Association / Registration Error | View Details |
| LOW BAT |
Thermostat displays 'LOW BAT', battery icon, or flashes a battery symbol; heating may become intermittent or RF range reduced.
|
Low Battery Voltage | View Details |
| NO LINK |
Smart thermostat app or display shows 'NO LINK' or link icon flashing; system cannot connect to Salus gateway or internet.
|
Gateway / Cloud Connectivity Loss | View Details |
| RF |
Thermostat shows RF error icon or 'RF' message; heating does not respond because the thermostat cannot communicate with the receiver.
|
Radio Frequency Communication Loss | View Details |
| WIFI |
Thermostat or app shows 'WIFI' error or Wi-Fi icon flashing; remote control via app not available.
|
Wi-Fi Connection Fault | View Details |
| – |
Battery-powered Salus thermostat will not turn on; screen remains off even with new batteries.
|
Battery Power / Internal Fault | View Details |
| – |
Heating does not turn on even though the thermostat is calling for heat (flame icon or 'ON' shown).
|
No Heat Output from Thermostat to Boiler | View Details |
| – |
Heating stays on constantly and does not turn off even when the thermostat is satisfied or turned down.
|
Stuck Relay / Permanent Call for Heat | View Details |
| – |
Thermostat backlight flickers or the display intermittently dims and brightens.
|
Unstable Internal Power / Backlight Driver Issue | View Details |
| – |
Thermostat cannot be added to the Salus app; pairing fails repeatedly.
|
Smart Registration / Pairing Failure | View Details |
| – |
Thermostat display completely blank; heating does not respond.
|
No Power to Thermostat | View Details |
| – |
Thermostat display is on but buttons or touchscreen are unresponsive.
|
Keypad / Touch Interface Failure | View Details |
| – |
Thermostat emits a burning smell or shows visible scorch marks.
|
Overheating / Component Failure | View Details |
| – |
Thermostat frequently loses connection to receiver; heating cuts in and out unpredictably.
|
Intermittent RF Communication | View Details |
| – |
Thermostat frequently overshoots the set temperature, making the room too warm.
|
Poor Temperature Control / Overshoot | View Details |
| – |
Thermostat frequently undershoots the set temperature; room never reaches the desired warmth.
|
Poor Temperature Control / Undershoot | View Details |
| – |
Thermostat makes loud clicking or buzzing noises when switching.
|
Mechanical Relay Noise / Coil Chatter | View Details |
| – |
Thermostat or receiver enclosure vibrates or hums when heating is on.
|
Mechanical Vibration / Mounting Issue | View Details |
| – |
Thermostat plastic housing becomes noticeably warm to the touch during normal operation.
|
Excessive Internal Heat Generation | View Details |
| – |
Thermostat randomly resets or restarts, losing time or settings.
|
Intermittent Power / Internal Reset | View Details |
| – |
Thermostat schedule does not follow programmed times; heating turns on/off at wrong times.
|
Clock / Schedule Misconfiguration | View Details |
| – |
Thermostat shows a temperature that is clearly incorrect (e.g. 5°C or 40°C in a normal room).
|
Room Sensor Misreading / Calibration Drift | View Details |
| – |
Thermostat shows Wi-Fi connected but app commands are delayed or not executed.
|
Cloud / Server Communication Latency | View Details |
| – |
Underfloor heating zones controlled by Salus manifold controller do not heat, even though thermostat calls for heat.
|
Zone Actuator / Manifold Control Failure | View Details |
No matching codes found
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