Roca
Roca Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Furnace does not ignite, burner does not light, ignition sequence aborts after a few seconds.
Ignition Failure / No Flame Detection
E02
Furnace locks out shortly after ignition; flame appears unstable or goes out repeatedly.
Flame Loss During Operation
E03
Furnace attempts to start but shuts down with an overheat indication; heat exchanger very hot, circulation pump may be off.
Overheat / High Limit Tripped
E04
Furnace displays a water pressure fault, will not fire; pressure gauge shows low or zero.
Low System Water Pressure
E05
Furnace shows a temperature sensor error; it may run briefly then shut down, or not start at all.
Flow Temperature Sensor (NTC) Fault
E06
Return temperature sensor error; furnace may cycle erratically or shut down with a code.
Return Temperature Sensor (NTC) Fault
E07
Furnace indicates flue or exhaust fault; burner stops, fan may continue to run.
Flue Gas Overtemperature / Flue Sensor Fault
E08
Furnace shows fan or air pressure error; burner does not light, fan may not start or runs briefly.
Combustion Fan / Air Pressure Switch Fault
E09
Furnace indicates gas valve or gas supply fault; no ignition despite fan and spark operating.
Gas Valve Control Fault
E10
Furnace control panel unresponsive or shows a communication error between the display and main board.
Control Board Communication Fault
E11
Furnace displays a domestic hot water (DHW) sensor error on combination models, resulting in unstable or unavailable hot water.
DHW Temperature Sensor Fault
E12
Furnace indicates a circulation pump fault; the unit overheats or shuts down quickly after firing.
Heating Circulation Pump Failure
E13
Furnace displays a flame detection error even when the burner is off, or indicates a false flame.
False Flame Detection / Ionization Circuit Fault
E14
Furnace indicates a condensate fault, shuts down during operation, and may show water under the unit.
Condensate Drain Blockage
E15
Furnace displays an external thermostat or room sensor error; heating does not respond correctly to room demand.
Room Thermostat / External Control Fault
E16
Furnace indicates a power supply or voltage error; it may reset randomly or fail to start.
Mains Supply / Low Voltage Fault
E17
Furnace displays a sensor calibration or configuration error after a board replacement or reset.
Configuration / Parameter Fault
E18
Furnace indicates an expansion vessel or pressure fluctuation fault; pressure rises rapidly when heating.
Expansion Vessel / Pressure Control Fault
E19
Furnace displays a sensor short-circuit error, often immediately at power-up.
NTC Sensor Short Circuit
E20
Furnace displays a sensor open-circuit error; the temperature reading is extremely low or missing.
NTC Sensor Open Circuit
Symptom
Domestic hot water temperature fluctuates between hot and cold during use.
Unstable DHW Temperature
Symptom
Furnace display is on but completely blank or unreadable (no characters or garbled text).
Display Module Failure
Symptom
Furnace runs, but radiators stay lukewarm; the home does not reach the set temperature.
Insufficient Heat Output / Underfiring
Symptom
Radiators on upper floors remain cold while lower ones heat normally.
Airlock / Poor Circulation to Upper Levels
Symptom
The furnace emits a strong gas smell around the unit, especially near the gas train.
Gas Leak at Furnace
Symptom
The furnace fan runs continuously even when there is no heat demand.
Fan Stuck On
Symptom
The furnace flame is yellow or orange and soots up the flue terminal.
Incomplete Combustion / Sooting
Symptom
The furnace frequently loses pressure over days or weeks without visible leaks.
Hidden System Leak / Microleak
Symptom
The furnace frequently short-cycles, turning on and off every few minutes.
Short Cycling / Control Instability
Symptom
The furnace ignites with a loud boom or pop, especially after a long off period.
Delayed Ignition
Symptom
The furnace is very noisy during operation, with humming, rattling, or vibration transmitted through the house.
Mechanical Vibration / Noise
Symptom
The furnace makes loud banging or knocking noises when starting or stopping.
Kettling / Water Hammer in Heat Exchanger
Symptom
The furnace produces a burning smell or plastic odor when running.
Overheating Electrical Components
Symptom
The furnace starts but shuts down when the thermostat is satisfied, then will not restart for a long time.
Lockout After Demand / Anti-Cycle Delay
Symptom
The furnace will not start at all; there is no display or lights on the control panel.
No Power / Dead Furnace
Symptom
The pressure relief valve frequently discharges water through the safety pipe.
Overpressure / Safety Valve Discharge
Symptom
Water is leaking from the bottom of the Roca furnace cabinet.
Internal Water Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Furnace does not ignite, burner does not light, ignition sequence aborts after a few seconds.
|
Ignition Failure / No Flame Detection | View Details |
| E02 |
Furnace locks out shortly after ignition; flame appears unstable or goes out repeatedly.
|
Flame Loss During Operation | View Details |
| E03 |
Furnace attempts to start but shuts down with an overheat indication; heat exchanger very hot, circulation pump may be off.
|
Overheat / High Limit Tripped | View Details |
| E04 |
Furnace displays a water pressure fault, will not fire; pressure gauge shows low or zero.
|
Low System Water Pressure | View Details |
| E05 |
Furnace shows a temperature sensor error; it may run briefly then shut down, or not start at all.
|
Flow Temperature Sensor (NTC) Fault | View Details |
| E06 |
Return temperature sensor error; furnace may cycle erratically or shut down with a code.
|
Return Temperature Sensor (NTC) Fault | View Details |
| E07 |
Furnace indicates flue or exhaust fault; burner stops, fan may continue to run.
|
Flue Gas Overtemperature / Flue Sensor Fault | View Details |
| E08 |
Furnace shows fan or air pressure error; burner does not light, fan may not start or runs briefly.
|
Combustion Fan / Air Pressure Switch Fault | View Details |
| E09 |
Furnace indicates gas valve or gas supply fault; no ignition despite fan and spark operating.
|
Gas Valve Control Fault | View Details |
| E10 |
Furnace control panel unresponsive or shows a communication error between the display and main board.
|
Control Board Communication Fault | View Details |
| E11 |
Furnace displays a domestic hot water (DHW) sensor error on combination models, resulting in unstable or unavailable hot water.
|
DHW Temperature Sensor Fault | View Details |
| E12 |
Furnace indicates a circulation pump fault; the unit overheats or shuts down quickly after firing.
|
Heating Circulation Pump Failure | View Details |
| E13 |
Furnace displays a flame detection error even when the burner is off, or indicates a false flame.
|
False Flame Detection / Ionization Circuit Fault | View Details |
| E14 |
Furnace indicates a condensate fault, shuts down during operation, and may show water under the unit.
|
Condensate Drain Blockage | View Details |
| E15 |
Furnace displays an external thermostat or room sensor error; heating does not respond correctly to room demand.
|
Room Thermostat / External Control Fault | View Details |
| E16 |
Furnace indicates a power supply or voltage error; it may reset randomly or fail to start.
|
Mains Supply / Low Voltage Fault | View Details |
| E17 |
Furnace displays a sensor calibration or configuration error after a board replacement or reset.
|
Configuration / Parameter Fault | View Details |
| E18 |
Furnace indicates an expansion vessel or pressure fluctuation fault; pressure rises rapidly when heating.
|
Expansion Vessel / Pressure Control Fault | View Details |
| E19 |
Furnace displays a sensor short-circuit error, often immediately at power-up.
|
NTC Sensor Short Circuit | View Details |
| E20 |
Furnace displays a sensor open-circuit error; the temperature reading is extremely low or missing.
|
NTC Sensor Open Circuit | View Details |
| – |
Domestic hot water temperature fluctuates between hot and cold during use.
|
Unstable DHW Temperature | View Details |
| – |
Furnace display is on but completely blank or unreadable (no characters or garbled text).
|
Display Module Failure | View Details |
| – |
Furnace runs, but radiators stay lukewarm; the home does not reach the set temperature.
|
Insufficient Heat Output / Underfiring | View Details |
| – |
Radiators on upper floors remain cold while lower ones heat normally.
|
Airlock / Poor Circulation to Upper Levels | View Details |
| – |
The furnace emits a strong gas smell around the unit, especially near the gas train.
|
Gas Leak at Furnace | View Details |
| – |
The furnace fan runs continuously even when there is no heat demand.
|
Fan Stuck On | View Details |
| – |
The furnace flame is yellow or orange and soots up the flue terminal.
|
Incomplete Combustion / Sooting | View Details |
| – |
The furnace frequently loses pressure over days or weeks without visible leaks.
|
Hidden System Leak / Microleak | View Details |
| – |
The furnace frequently short-cycles, turning on and off every few minutes.
|
Short Cycling / Control Instability | View Details |
| – |
The furnace ignites with a loud boom or pop, especially after a long off period.
|
Delayed Ignition | View Details |
| – |
The furnace is very noisy during operation, with humming, rattling, or vibration transmitted through the house.
|
Mechanical Vibration / Noise | View Details |
| – |
The furnace makes loud banging or knocking noises when starting or stopping.
|
Kettling / Water Hammer in Heat Exchanger | View Details |
| – |
The furnace produces a burning smell or plastic odor when running.
|
Overheating Electrical Components | View Details |
| – |
The furnace starts but shuts down when the thermostat is satisfied, then will not restart for a long time.
|
Lockout After Demand / Anti-Cycle Delay | View Details |
| – |
The furnace will not start at all; there is no display or lights on the control panel.
|
No Power / Dead Furnace | View Details |
| – |
The pressure relief valve frequently discharges water through the safety pipe.
|
Overpressure / Safety Valve Discharge | View Details |
| – |
Water is leaking from the bottom of the Roca furnace cabinet.
|
Internal Water Leak | View Details |
No matching codes found
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