Riello
Riello Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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A01
Burner locks out shortly after start attempt, red lockout light on burner control, furnace does not ignite
Failed Ignition Lockout
A02
Burner locks out during operation after flame has been established, red lockout light on, furnace stops mid-cycle
Flame Loss During Run
A03
Burner locks out with pre-ventilation but no flame attempt, control indicates safety lockout before ignition
Pre-ignition Safety Lockout
A04
Burner locks out with indication of overheat or safety thermostat trip, furnace very hot to the touch
High Limit or Overheat Lockout
A05
Burner control indicates lockout due to internal fault, no start sequence, red light on immediately
Internal Control Box Failure
A06
Burner attempts to start but shuts down with code indicating ignition failure or no flame detected
Ignition Failure / No Flame Signal
A07
Burner locks out with indication of flame present at wrong time (flame signal before or after allowed window)
False Flame Detection
A08
Burner stops with code indicating air pressure or fan fault during operation
Combustion Air Fan / Pressure Fault
A09
Burner locks out with indication of too many restart attempts or repeated flame failures
Repeated Flame Failure Lockout
A10
Burner control indicates lockout due to low or missing line voltage during operation
Low Voltage / Power Supply Fault
A11
Burner locks out with code indicating safety chain open (limit, door switch, or external safety open)
Open Safety Circuit
A12
Burner indicates lockout due to internal temperature sensor or control overheating
Control Overtemperature Fault
A13
Burner locks out with code indicating pre-purge or post-purge timing error
Purge Cycle Fault
A14
Burner indicates lockout due to incorrect sequence of safety inputs (e.g., limit opens at wrong time)
Safety Sequence Error
A15
Burner locks out with code indicating photocell short circuit or sensor failure
Flame Sensor Circuit Fault
A16
Burner indicates lockout due to too many resets or manual interventions in a short period
Excessive Reset Lockout
E01
Electronic display on Riello furnace shows E01, burner does not start, lockout condition
General Ignition Failure (Electronic Code)
E02
Display shows E02, burner starts then stops, indicating flame loss during run
Flame Loss During Operation (Electronic Code)
E03
Display shows E03, indicating overheat or high limit trip on Riello furnace
Overheat / High Limit Trip (Electronic Code)
E04
Display shows E04, indicating flue gas or draft fault
Flue Gas / Draft Fault
E05
Display shows E05, indicating air pressure switch or fan proving fault
Air Pressure / Fan Proving Fault
E06
Display shows E06, indicating flame sensor or photocell error
Flame Detection Error
E07
Display shows E07, indicating communication error between furnace control and Riello burner
Control Communication Fault
E08
Display shows E08, indicating low water or flow fault on hydronic Riello furnace/boiler
Low Water / Flow Fault
E09
Display shows E09, indicating sensor error (supply temperature sensor or return sensor)
Temperature Sensor Fault
Symptom
Burner ignites but flame is very yellow and unstable
Poor Combustion / Incorrect Air-Fuel Mix
Symptom
Burner lockout occurs mostly in very cold weather, furnace struggles to start
Cold Weather Fuel / Combustion Issue
Symptom
Burner starts and stops repeatedly within a few seconds, never establishing stable flame
Failed Flame Stabilization
Symptom
Furnace blower runs but burner does not fire, air from vents is cool
Blower-Only Operation
Symptom
Furnace burner fan runs but there is no oil flow (no sound of combustion, no pressure at nozzle)
Fuel Pump / Oil Supply Failure
Symptom
Furnace is very noisy during operation, with whistling or high-pitched sounds from burner
Combustion Air Noise / Resonance
Symptom
Furnace makes loud rumbling or booming noise at startup
Delayed Ignition / Combustion Instability
Symptom
Furnace produces a strong oil smell around the burner or in the room
Oil Leakage / Incomplete Combustion Odor
Symptom
Furnace runs but carbon monoxide detector in home alarms
Unsafe Combustion / CO Production
Symptom
Furnace runs but house does not heat adequately, burner cycles frequently
Insufficient Heat Output
Symptom
Furnace short cycles (turns on and off frequently) without reaching set temperature
Short Cycling
Symptom
Furnace starts but produces no flame, you hear the fan and possibly the pump, then it shuts down
No Flame on Start
Symptom
Furnace trips the household circuit breaker when burner starts
Electrical Short / Overcurrent
Symptom
Furnace vibrates excessively when burner is running
Vibration / Imbalance
Symptom
Furnace will not start at all, no burner operation, no attempt to ignite, but power is present
No-Start Condition
Symptom
Visible black smoke from chimney or flue terminal
Sooting / Rich Combustion
Symptom
Water or condensation dripping from furnace or flue connection
Condensation / Drainage Issue
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| A01 |
Burner locks out shortly after start attempt, red lockout light on burner control, furnace does not ignite
|
Failed Ignition Lockout | View Details |
| A02 |
Burner locks out during operation after flame has been established, red lockout light on, furnace stops mid-cycle
|
Flame Loss During Run | View Details |
| A03 |
Burner locks out with pre-ventilation but no flame attempt, control indicates safety lockout before ignition
|
Pre-ignition Safety Lockout | View Details |
| A04 |
Burner locks out with indication of overheat or safety thermostat trip, furnace very hot to the touch
|
High Limit or Overheat Lockout | View Details |
| A05 |
Burner control indicates lockout due to internal fault, no start sequence, red light on immediately
|
Internal Control Box Failure | View Details |
| A06 |
Burner attempts to start but shuts down with code indicating ignition failure or no flame detected
|
Ignition Failure / No Flame Signal | View Details |
| A07 |
Burner locks out with indication of flame present at wrong time (flame signal before or after allowed window)
|
False Flame Detection | View Details |
| A08 |
Burner stops with code indicating air pressure or fan fault during operation
|
Combustion Air Fan / Pressure Fault | View Details |
| A09 |
Burner locks out with indication of too many restart attempts or repeated flame failures
|
Repeated Flame Failure Lockout | View Details |
| A10 |
Burner control indicates lockout due to low or missing line voltage during operation
|
Low Voltage / Power Supply Fault | View Details |
| A11 |
Burner locks out with code indicating safety chain open (limit, door switch, or external safety open)
|
Open Safety Circuit | View Details |
| A12 |
Burner indicates lockout due to internal temperature sensor or control overheating
|
Control Overtemperature Fault | View Details |
| A13 |
Burner locks out with code indicating pre-purge or post-purge timing error
|
Purge Cycle Fault | View Details |
| A14 |
Burner indicates lockout due to incorrect sequence of safety inputs (e.g., limit opens at wrong time)
|
Safety Sequence Error | View Details |
| A15 |
Burner locks out with code indicating photocell short circuit or sensor failure
|
Flame Sensor Circuit Fault | View Details |
| A16 |
Burner indicates lockout due to too many resets or manual interventions in a short period
|
Excessive Reset Lockout | View Details |
| E01 |
Electronic display on Riello furnace shows E01, burner does not start, lockout condition
|
General Ignition Failure (Electronic Code) | View Details |
| E02 |
Display shows E02, burner starts then stops, indicating flame loss during run
|
Flame Loss During Operation (Electronic Code) | View Details |
| E03 |
Display shows E03, indicating overheat or high limit trip on Riello furnace
|
Overheat / High Limit Trip (Electronic Code) | View Details |
| E04 |
Display shows E04, indicating flue gas or draft fault
|
Flue Gas / Draft Fault | View Details |
| E05 |
Display shows E05, indicating air pressure switch or fan proving fault
|
Air Pressure / Fan Proving Fault | View Details |
| E06 |
Display shows E06, indicating flame sensor or photocell error
|
Flame Detection Error | View Details |
| E07 |
Display shows E07, indicating communication error between furnace control and Riello burner
|
Control Communication Fault | View Details |
| E08 |
Display shows E08, indicating low water or flow fault on hydronic Riello furnace/boiler
|
Low Water / Flow Fault | View Details |
| E09 |
Display shows E09, indicating sensor error (supply temperature sensor or return sensor)
|
Temperature Sensor Fault | View Details |
| – |
Burner ignites but flame is very yellow and unstable
|
Poor Combustion / Incorrect Air-Fuel Mix | View Details |
| – |
Burner lockout occurs mostly in very cold weather, furnace struggles to start
|
Cold Weather Fuel / Combustion Issue | View Details |
| – |
Burner starts and stops repeatedly within a few seconds, never establishing stable flame
|
Failed Flame Stabilization | View Details |
| – |
Furnace blower runs but burner does not fire, air from vents is cool
|
Blower-Only Operation | View Details |
| – |
Furnace burner fan runs but there is no oil flow (no sound of combustion, no pressure at nozzle)
|
Fuel Pump / Oil Supply Failure | View Details |
| – |
Furnace is very noisy during operation, with whistling or high-pitched sounds from burner
|
Combustion Air Noise / Resonance | View Details |
| – |
Furnace makes loud rumbling or booming noise at startup
|
Delayed Ignition / Combustion Instability | View Details |
| – |
Furnace produces a strong oil smell around the burner or in the room
|
Oil Leakage / Incomplete Combustion Odor | View Details |
| – |
Furnace runs but carbon monoxide detector in home alarms
|
Unsafe Combustion / CO Production | View Details |
| – |
Furnace runs but house does not heat adequately, burner cycles frequently
|
Insufficient Heat Output | View Details |
| – |
Furnace short cycles (turns on and off frequently) without reaching set temperature
|
Short Cycling | View Details |
| – |
Furnace starts but produces no flame, you hear the fan and possibly the pump, then it shuts down
|
No Flame on Start | View Details |
| – |
Furnace trips the household circuit breaker when burner starts
|
Electrical Short / Overcurrent | View Details |
| – |
Furnace vibrates excessively when burner is running
|
Vibration / Imbalance | View Details |
| – |
Furnace will not start at all, no burner operation, no attempt to ignite, but power is present
|
No-Start Condition | View Details |
| – |
Visible black smoke from chimney or flue terminal
|
Sooting / Rich Combustion | View Details |
| – |
Water or condensation dripping from furnace or flue connection
|
Condensation / Drainage Issue | View Details |
No matching codes found
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