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
The furnace does not start; the display shows E0 immediately after power-up.
No communication between main control PCB and user interface
E1
The furnace locks out shortly after a start attempt; the 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; the burner does not start for a heating demand.
Room thermostat / External control signal fault
E12
Furnace shows E12; the burner stops unexpectedly during operation.
Gas valve control fault / Modulation error
E13
Display shows E13; the furnace may run at limited output.
Outdoor temperature sensor fault (if installed)
E14
The furnace shows E14; no burner operation.
Ionisation current too low / flame detection error
E15
Display shows E15; the furnace shuts down quickly after starting.
Fan speed control / tachometer fault
E16
The furnace shows E16; intermittent lockouts occur during operation.
Power supply / mains frequency fault
E17
Display shows E17; no heating, and the pump may run briefly.
Flow switch / flow sensor fault (if installed)
E18
The furnace shows E18; the burner does not start for DHW demand.
DHW flow detection fault
E19
Display shows E19; the furnace may lock out intermittently.
Internal communication error between control modules
E2
The furnace attempts to start but shuts down with E2 on the display.
Flame loss during operation
E20
The furnace shows E20; burner output is limited or shut down.
Condensate drain fault / condensate level high
E21
Display shows E21; the furnace will not start, often after service work.
Safety interlock open (e.g., door switch, flue inspection switch)
E22
The furnace shows E22; the 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; the fan may run.
Flue gas recirculation / CO₂ out of range.
E25
Display shows E25; the furnace may continue at reduced power.
Internal temperature sensor fault (PCB or casing sensor).
E3
Furnace shows E3 and will not start; the fan may run briefly.
Flue gas temperature too high / Flue gas sensor fault
E4
Display shows E4; the furnace does not fire, but the pump may run.
Flow temperature sensor fault (open or short circuit)
E5
Furnace shows E5 and stops heating; it 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; the 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; the 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 does not power on at all; the display is blank.
No power / dead appliance
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 the relief valve discharges water.
Expansion vessel failure
Symptom
The furnace display shows normal operation, but radiators are only warm at the top and cold at the bottom.
Sludge accumulation in radiators
Symptom
The furnace emits a burning or plastic smell during operation.
Overheating of electrical or plastic components
Symptom
The furnace frequently starts and stops (short cycling) without maintaining a stable temperature.
Short cycling due to oversizing or control issues.
Symptom
The furnace is running, but there is no domestic hot water at the taps.
No DHW production.
Symptom
The furnace is very noisy during operation (whistling, roaring, or droning sound).
Combustion or fan noise.
Symptom
The furnace makes loud banging or knocking noises when starting or stopping.
Kettling / rapid boiling in the heat exchanger.
Symptom
The furnace runs, but some radiators stay cold or only lukewarm.
Poor circulation / system imbalance.
Symptom
The furnace runs, but the room temperature overshoots the setpoint significantly.
Poor temperature control / overshoot
Symptom
The furnace starts but shuts down after a few seconds without showing an error code.
Unstable flame / marginal ignition
Symptom
Water leaking from the bottom of the furnace casing.
Internal water leak.
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E0 |
The furnace does not start; the display shows E0 immediately after power-up.
|
No communication between main control PCB and user interface | View Details |
| E1 |
The furnace locks out shortly after a start attempt; the 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; the burner does not start for a heating demand.
|
Room thermostat / External control signal fault | View Details |
| E12 |
Furnace shows E12; the burner stops unexpectedly during operation.
|
Gas valve control fault / Modulation error | View Details |
| E13 |
Display shows E13; the furnace may run at limited output.
|
Outdoor temperature sensor fault (if installed) | View Details |
| E14 |
The furnace shows E14; no burner operation.
|
Ionisation current too low / flame detection error | View Details |
| E15 |
Display shows E15; the furnace shuts down quickly after starting.
|
Fan speed control / tachometer fault | View Details |
| E16 |
The furnace shows E16; intermittent lockouts occur during operation.
|
Power supply / mains frequency fault | View Details |
| E17 |
Display shows E17; no heating, and the pump may run briefly.
|
Flow switch / flow sensor fault (if installed) | View Details |
| E18 |
The furnace shows E18; the burner does not start for DHW demand.
|
DHW flow detection fault | View Details |
| E19 |
Display shows E19; the furnace may lock out intermittently.
|
Internal communication error between control modules | View Details |
| E2 |
The furnace attempts to start but shuts down with E2 on the display.
|
Flame loss during operation | View Details |
| E20 |
The furnace shows E20; burner output is limited or shut down.
|
Condensate drain fault / condensate level high | View Details |
| E21 |
Display shows E21; the furnace will not start, often after service work.
|
Safety interlock open (e.g., door switch, flue inspection switch) | View Details |
| E22 |
The furnace shows E22; the 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; the fan may run.
|
Flue gas recirculation / CO₂ out of range. | View Details |
| E25 |
Display shows E25; the furnace may continue at reduced power.
|
Internal temperature sensor fault (PCB or casing sensor). | View Details |
| E3 |
Furnace shows E3 and will not start; the fan may run briefly.
|
Flue gas temperature too high / Flue gas sensor fault | View Details |
| E4 |
Display shows E4; the furnace does not fire, but the pump may run.
|
Flow temperature sensor fault (open or short circuit) | View Details |
| E5 |
Furnace shows E5 and stops heating; it 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; the 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; the 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 does not power on at all; the display is blank.
|
No power / dead appliance | 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 the relief valve discharges water.
|
Expansion vessel failure | View Details |
| – |
The furnace display shows normal operation, but radiators are only warm at the top and cold at the bottom.
|
Sludge accumulation in radiators | View Details |
| – |
The furnace emits a burning or plastic smell during operation.
|
Overheating of electrical or plastic components | View Details |
| – |
The furnace frequently starts and stops (short cycling) without maintaining a stable temperature.
|
Short cycling due to oversizing or control issues. | View Details |
| – |
The furnace is running, but there is no domestic hot water at the taps.
|
No DHW production. | View Details |
| – |
The furnace is very noisy during operation (whistling, roaring, or droning sound).
|
Combustion or fan noise. | View Details |
| – |
The furnace makes loud banging or knocking noises when starting or stopping.
|
Kettling / rapid boiling in the heat exchanger. | View Details |
| – |
The furnace runs, but some radiators stay cold or only lukewarm.
|
Poor circulation / system imbalance. | View Details |
| – |
The furnace runs, but the room temperature overshoots the setpoint significantly.
|
Poor temperature control / overshoot | View Details |
| – |
The furnace starts but shuts down after a few seconds without showing an error code.
|
Unstable flame / marginal ignition | View Details |
| – |
Water leaking from the bottom of the furnace casing.
|
Internal water leak. | View Details |
No matching codes found
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