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, 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 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 communication error between display and main board
Control Board Communication Fault
E11
Furnace shows domestic hot water (DHW) sensor error on combination models, hot water unstable or not available
DHW Temperature Sensor Fault
E12
Furnace indicates circulation pump fault, unit overheats or shuts down quickly after firing
Heating Circulation Pump Failure
E13
Furnace shows flame detection error even when burner is off, or indicates false flame
False Flame Detection / Ionization Circuit Fault
E14
Furnace indicates condensate fault, shuts down during operation, may show water under unit
Condensate Drain Blockage
E15
Furnace shows external thermostat or room sensor error, heating does not respond to room demand correctly
Room Thermostat / External Control Fault
E16
Furnace indicates power supply or voltage error, may reset randomly or not start
Mains Supply / Low Voltage Fault
E17
Furnace shows sensor calibration or configuration error after board replacement or reset
Configuration / Parameter Fault
E18
Furnace indicates expansion vessel or pressure fluctuation fault, pressure rises rapidly when heating
Expansion Vessel / Pressure Control Fault
E19
Furnace shows sensor short-circuit error, often immediately at power-up
NTC Sensor Short Circuit
E20
Furnace shows sensor open-circuit error, temperature reading 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 emits a strong gas smell around the unit, especially near the gas train
Gas Leak at Furnace
Symptom
Furnace fan runs continuously even when there is no heat demand
Fan Stuck On
Symptom
Furnace flame is yellow or orange and soots up the flue terminal
Incomplete Combustion / Sooting
Symptom
Furnace frequently loses pressure over days or weeks without visible leaks
Hidden System Leak / Microleak
Symptom
Furnace frequently short-cycles, turning on and off every few minutes
Short Cycling / Control Instability
Symptom
Furnace ignites with a loud boom or pop, especially after a long off period
Delayed Ignition
Symptom
Furnace is very noisy during operation, with humming, rattling, or vibration transmitted through the house
Mechanical Vibration / Noise
Symptom
Furnace makes loud banging or knocking noises when starting or stopping
Kettling / Water Hammer in Heat Exchanger
Symptom
Furnace produces a burning smell or plastic odor when running
Overheating Electrical Components
Symptom
Furnace runs but radiators stay lukewarm, home does not reach set temperature
Insufficient Heat Output / Underfiring
Symptom
Furnace starts but shuts down when thermostat is satisfied, then will not restart for a long time
Lockout After Demand / Anti-Cycle Delay
Symptom
Furnace will not start at all, no display or lights on the control panel
No Power / Dead Furnace
Symptom
Pressure relief valve discharges water frequently through the safety pipe
Overpressure / Safety Valve Discharge
Symptom
Radiators on upper floors remain cold while lower ones heat normally
Airlock / Poor Circulation to Upper Levels
Symptom
Water 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, 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 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 communication error between display and main board
|
Control Board Communication Fault | View Details |
| E11 |
Furnace shows domestic hot water (DHW) sensor error on combination models, hot water unstable or not available
|
DHW Temperature Sensor Fault | View Details |
| E12 |
Furnace indicates circulation pump fault, unit overheats or shuts down quickly after firing
|
Heating Circulation Pump Failure | View Details |
| E13 |
Furnace shows flame detection error even when burner is off, or indicates false flame
|
False Flame Detection / Ionization Circuit Fault | View Details |
| E14 |
Furnace indicates condensate fault, shuts down during operation, may show water under unit
|
Condensate Drain Blockage | View Details |
| E15 |
Furnace shows external thermostat or room sensor error, heating does not respond to room demand correctly
|
Room Thermostat / External Control Fault | View Details |
| E16 |
Furnace indicates power supply or voltage error, may reset randomly or not start
|
Mains Supply / Low Voltage Fault | View Details |
| E17 |
Furnace shows sensor calibration or configuration error after board replacement or reset
|
Configuration / Parameter Fault | View Details |
| E18 |
Furnace indicates expansion vessel or pressure fluctuation fault, pressure rises rapidly when heating
|
Expansion Vessel / Pressure Control Fault | View Details |
| E19 |
Furnace shows sensor short-circuit error, often immediately at power-up
|
NTC Sensor Short Circuit | View Details |
| E20 |
Furnace shows sensor open-circuit error, temperature reading 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 emits a strong gas smell around the unit, especially near the gas train
|
Gas Leak at Furnace | View Details |
| – |
Furnace fan runs continuously even when there is no heat demand
|
Fan Stuck On | View Details |
| – |
Furnace flame is yellow or orange and soots up the flue terminal
|
Incomplete Combustion / Sooting | View Details |
| – |
Furnace frequently loses pressure over days or weeks without visible leaks
|
Hidden System Leak / Microleak | View Details |
| – |
Furnace frequently short-cycles, turning on and off every few minutes
|
Short Cycling / Control Instability | View Details |
| – |
Furnace ignites with a loud boom or pop, especially after a long off period
|
Delayed Ignition | View Details |
| – |
Furnace is very noisy during operation, with humming, rattling, or vibration transmitted through the house
|
Mechanical Vibration / Noise | View Details |
| – |
Furnace makes loud banging or knocking noises when starting or stopping
|
Kettling / Water Hammer in Heat Exchanger | View Details |
| – |
Furnace produces a burning smell or plastic odor when running
|
Overheating Electrical Components | View Details |
| – |
Furnace runs but radiators stay lukewarm, home does not reach set temperature
|
Insufficient Heat Output / Underfiring | View Details |
| – |
Furnace starts but shuts down when thermostat is satisfied, then will not restart for a long time
|
Lockout After Demand / Anti-Cycle Delay | View Details |
| – |
Furnace will not start at all, no display or lights on the control panel
|
No Power / Dead Furnace | View Details |
| – |
Pressure relief valve discharges water frequently through the safety pipe
|
Overpressure / Safety Valve Discharge | View Details |
| – |
Radiators on upper floors remain cold while lower ones heat normally
|
Airlock / Poor Circulation to Upper Levels | View Details |
| – |
Water leaking from the bottom of the Roca furnace cabinet
|
Internal Water Leak | View Details |
No matching codes found
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