Remeha
Remeha Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E0
Furnace does not start, display shows E0 immediately after power-up
No communication between main control PCB and user interface
E1
Furnace locks out shortly after start attempt, display shows E1
Ignition failure / no flame detected
E10
Furnace shows E10, no heating or hot water
Domestic hot water (DHW) sensor fault
E11
Furnace shows E11, burner does not start for heating demand
Room thermostat / external control signal fault
E12
Furnace shows E12, burner stops unexpectedly during operation
Gas valve control fault / modulation error
E13
Display shows E13, furnace may run at limited output
Outdoor temperature sensor fault (if fitted)
E14
Furnace shows E14, no burner operation
Ionisation current too low / flame detection error
E15
Display shows E15, furnace shuts down quickly after start
Fan speed control / tachometer fault
E16
Furnace shows E16, intermittent lockouts during operation
Power supply / mains frequency fault
E17
Display shows E17, no heating, pump may run briefly
Flow switch / flow sensor fault (if fitted)
E18
Furnace shows E18, burner does not start for DHW demand
DHW flow detection fault
E19
Display shows E19, furnace may lock out intermittently
Internal communication error between control modules
E2
Furnace attempts to start but shuts down with E2 on display
Flame loss during operation
E20
Furnace shows E20, burner output limited or shut down
Condensate drain fault / condensate level high
E21
Display shows E21, furnace will not start, often after service work
Safety interlock open (e.g., door switch, flue inspection switch)
E22
Furnace shows E22, burner stops and restarts frequently
Return temperature too high / insufficient heat dissipation
E23
Display shows E23, furnace does not respond to external control
OpenTherm communication fault
E24
Furnace shows E24, no burner operation, fan may run
Flue gas recirculation / CO₂ out of range
E25
Display shows E25, furnace may continue at reduced power
Internal temperature sensor fault (PCB or casing sensor)
E3
Furnace shows E3 and will not start, fan may run briefly
Flue gas temperature too high / flue gas sensor fault
E4
Display shows E4, furnace does not fire, pump may run
Flow temperature sensor fault (open or short circuit)
E5
Furnace shows E5 and stops heating, may restart intermittently
Return temperature sensor fault (open or short circuit)
E6
Furnace locks out with E6, no ignition sequence starts
Air pressure / fan proving fault
E7
Display shows E7, furnace may run at reduced output or shut down
Flow/return temperature difference too high (poor circulation)
E8
Furnace shows E8 and stops, often after running for a short time
Overheat / safety temperature limiter (STB) tripped
E9
Display shows E9, furnace will not operate
Low water pressure / water pressure sensor fault
Symptom
Condensate water dripping from flue joints or outside the condensate pipe
Condensate leakage from flue or trap
Symptom
Furnace display shows normal operation but radiators are only warm at the top and cold at the bottom
Sludge accumulation in radiators
Symptom
Furnace does not power on at all, display is blank
No power / dead appliance
Symptom
Furnace emits a burning smell or plastic smell during operation
Overheating of electrical or plastic components
Symptom
Furnace frequently starts and stops (short cycling) without maintaining stable temperature
Short cycling due to oversizing or control issues
Symptom
Furnace is running but there is no domestic hot water at taps
No DHW production
Symptom
Furnace is very noisy during operation (whistling, roaring, or droning sound)
Combustion or fan noise
Symptom
Furnace makes loud banging or knocking noises when starting or stopping
Kettling / rapid boiling in heat exchanger
Symptom
Furnace runs but room temperature overshoots setpoint significantly
Poor temperature control / overshoot
Symptom
Furnace runs but some radiators stay cold or only lukewarm
Poor circulation / system imbalance
Symptom
Furnace starts but shuts down after a few seconds without showing an error code
Unstable flame / marginal ignition
Symptom
Radiators get hot even when the room thermostat is turned down or off
Uncontrolled heating / boiler firing without demand
Symptom
System pressure rises rapidly when heating and relief valve discharges water
Expansion vessel failure
Symptom
Water leaking from the bottom of the furnace casing
Internal water leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E0 |
Furnace does not start, display shows E0 immediately after power-up
|
No communication between main control PCB and user interface | View Details |
| E1 |
Furnace locks out shortly after start attempt, display shows E1
|
Ignition failure / no flame detected | View Details |
| E10 |
Furnace shows E10, no heating or hot water
|
Domestic hot water (DHW) sensor fault | View Details |
| E11 |
Furnace shows E11, burner does not start for heating demand
|
Room thermostat / external control signal fault | View Details |
| E12 |
Furnace shows E12, burner stops unexpectedly during operation
|
Gas valve control fault / modulation error | View Details |
| E13 |
Display shows E13, furnace may run at limited output
|
Outdoor temperature sensor fault (if fitted) | View Details |
| E14 |
Furnace shows E14, no burner operation
|
Ionisation current too low / flame detection error | View Details |
| E15 |
Display shows E15, furnace shuts down quickly after start
|
Fan speed control / tachometer fault | View Details |
| E16 |
Furnace shows E16, intermittent lockouts during operation
|
Power supply / mains frequency fault | View Details |
| E17 |
Display shows E17, no heating, pump may run briefly
|
Flow switch / flow sensor fault (if fitted) | View Details |
| E18 |
Furnace shows E18, burner does not start for DHW demand
|
DHW flow detection fault | View Details |
| E19 |
Display shows E19, furnace may lock out intermittently
|
Internal communication error between control modules | View Details |
| E2 |
Furnace attempts to start but shuts down with E2 on display
|
Flame loss during operation | View Details |
| E20 |
Furnace shows E20, burner output limited or shut down
|
Condensate drain fault / condensate level high | View Details |
| E21 |
Display shows E21, furnace will not start, often after service work
|
Safety interlock open (e.g., door switch, flue inspection switch) | View Details |
| E22 |
Furnace shows E22, burner stops and restarts frequently
|
Return temperature too high / insufficient heat dissipation | View Details |
| E23 |
Display shows E23, furnace does not respond to external control
|
OpenTherm communication fault | View Details |
| E24 |
Furnace shows E24, no burner operation, fan may run
|
Flue gas recirculation / CO₂ out of range | View Details |
| E25 |
Display shows E25, furnace may continue at reduced power
|
Internal temperature sensor fault (PCB or casing sensor) | View Details |
| E3 |
Furnace shows E3 and will not start, fan may run briefly
|
Flue gas temperature too high / flue gas sensor fault | View Details |
| E4 |
Display shows E4, furnace does not fire, pump may run
|
Flow temperature sensor fault (open or short circuit) | View Details |
| E5 |
Furnace shows E5 and stops heating, may restart intermittently
|
Return temperature sensor fault (open or short circuit) | View Details |
| E6 |
Furnace locks out with E6, no ignition sequence starts
|
Air pressure / fan proving fault | View Details |
| E7 |
Display shows E7, furnace may run at reduced output or shut down
|
Flow/return temperature difference too high (poor circulation) | View Details |
| E8 |
Furnace shows E8 and stops, often after running for a short time
|
Overheat / safety temperature limiter (STB) tripped | View Details |
| E9 |
Display shows E9, furnace will not operate
|
Low water pressure / water pressure sensor fault | View Details |
| – |
Condensate water dripping from flue joints or outside the condensate pipe
|
Condensate leakage from flue or trap | View Details |
| – |
Furnace display shows normal operation but radiators are only warm at the top and cold at the bottom
|
Sludge accumulation in radiators | View Details |
| – |
Furnace does not power on at all, display is blank
|
No power / dead appliance | View Details |
| – |
Furnace emits a burning smell or plastic smell during operation
|
Overheating of electrical or plastic components | View Details |
| – |
Furnace frequently starts and stops (short cycling) without maintaining stable temperature
|
Short cycling due to oversizing or control issues | View Details |
| – |
Furnace is running but there is no domestic hot water at taps
|
No DHW production | View Details |
| – |
Furnace is very noisy during operation (whistling, roaring, or droning sound)
|
Combustion or fan noise | View Details |
| – |
Furnace makes loud banging or knocking noises when starting or stopping
|
Kettling / rapid boiling in heat exchanger | View Details |
| – |
Furnace runs but room temperature overshoots setpoint significantly
|
Poor temperature control / overshoot | View Details |
| – |
Furnace runs but some radiators stay cold or only lukewarm
|
Poor circulation / system imbalance | View Details |
| – |
Furnace starts but shuts down after a few seconds without showing an error code
|
Unstable flame / marginal ignition | View Details |
| – |
Radiators get hot even when the room thermostat is turned down or off
|
Uncontrolled heating / boiler firing without demand | View Details |
| – |
System pressure rises rapidly when heating and relief valve discharges water
|
Expansion vessel failure | View Details |
| – |
Water leaking from the bottom of the furnace casing
|
Internal water leak | View Details |
No matching codes found
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