Utica
Utica Boilers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E0
Boiler control display shows E0 and burner will not start
Outdoor Sensor Circuit Fault
E1
Boiler locks out with E1 code, no ignition, circulator may run briefly
Ignition Failure / Flame Not Established
E10
Boiler shows E10 and locks out, often after several failed ignition attempts
Ignition Lockout (Exceeded Retry Limit)
E11
Boiler displays E11 and shuts down immediately after call for heat
Blocked Air Intake / Combustion Air Fault
E12
Boiler shows E12 and will not start the burner fan
Fan / Blower Failure
E13
Boiler displays E13 and shuts down during operation
Condensate Drain Blocked
E14
Boiler shows E14 and will not fire, often after venting work
Air Pressure Switch Open / Proving Failure
E15
Boiler displays E15 and locks out, often with very high temperature reading
Overheat / Safety Thermostat Trip
E16
Boiler shows E16 and will not respond to thermostat, display may show abnormal room temperature
Room / Indoor Sensor Fault (if equipped)
E17
Boiler displays E17 and locks out, often after a power surge or lightning storm
Internal Control Board Fault
E18
Boiler shows E18 and may continue to run at reduced output
Modulation / Gas Valve Control Fault
E19
Boiler displays E19 and will not start, often after wiring changes
Thermostat / Call for Heat Input Fault
E2
Boiler shows E2 and shuts down shortly after ignition attempt
Flame Loss During Run
E20
Boiler shows E20 and may shut down intermittently
Power Supply / Line Voltage Fault
E3
Boiler displays E3 and will not fire, circulator may run
High Limit Temperature Lockout
E4
Boiler shows E4 and shuts down before or during ignition
Exhaust / Flue Temperature Fault
E5
Boiler control displays E5 and unit will not start
Low Water Pressure / Low System Water
E6
Boiler shows E6 and shuts down, often accompanied by gurgling sounds in piping
Low Water Flow / Flow Switch Open
E7
Boiler displays E7 and will not respond to thermostat calls
Communication Error Between User Interface and Main Control
E8
Boiler shows E8 and shuts down, often after running for a short period
Return Water Temperature Sensor Fault
E9
Boiler displays E9 and will not fire, may show abnormal supply temperature reading
Supply Water Temperature Sensor Fault
Symptom
Boiler burner makes a roaring or rumbling noise during operation
Combustion Noise / Improper Combustion
Symptom
Boiler circulator pump is very hot to the touch and system is not heating
Seized or Failed Circulator Pump
Symptom
Boiler cycles on and off when only domestic hot water is used (combi models), with temperature swings at taps
DHW Flow Control / Minimum Flow Issue
Symptom
Boiler display is on but unresponsive, buttons do not change settings
User Interface / Keypad Failure
Symptom
Boiler emits a burning plastic or electrical smell during operation
Overheating Electrical Component
Symptom
Boiler frequently locks out during very cold weather, then restarts after reset
Cold Weather / Freeze-Related Issues
Symptom
Boiler ignites with a loud bang or pop (delayed ignition)
Delayed Ignition
Symptom
Boiler makes loud banging or knocking noises when firing or shortly after
Kettling / Boiling in Heat Exchanger
Symptom
Boiler operates but flue gases or exhaust smell are noticeable in the boiler room
Flue Gas Leakage
Symptom
Boiler or nearby piping emits a constant gurgling or trickling water sound
Air in System / Air Lock
Symptom
Boiler pressure rises excessively when heating, relief valve opens and discharges water
Over-Pressurization of Hydronic System
Symptom
Boiler runs but does not heat the house adequately, radiators lukewarm
Insufficient Boiler Output / Underfiring
Symptom
Boiler runs but domestic hot water is insufficient or fluctuates (on Utica combi or with indirect tank)
Domestic Hot Water Performance Issue
Symptom
Boiler runs continuously and overshoots thermostat setting, house becomes too warm
Boiler Fails to Shut Off on Temperature
Symptom
Boiler short cycles, turning on and off frequently without long run times
Short Cycling / Control or System Imbalance
Symptom
Boiler will not start at all, no display or lights on Utica control
No Power to Boiler
Symptom
Strong gas smell near the Utica boiler, especially during or after ignition attempts
Gas Leak or Incomplete Ignition
Symptom
Water leaking from the bottom of the Utica boiler cabinet
Boiler or Piping Water Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E0 |
Boiler control display shows E0 and burner will not start
|
Outdoor Sensor Circuit Fault | View Details |
| E1 |
Boiler locks out with E1 code, no ignition, circulator may run briefly
|
Ignition Failure / Flame Not Established | View Details |
| E10 |
Boiler shows E10 and locks out, often after several failed ignition attempts
|
Ignition Lockout (Exceeded Retry Limit) | View Details |
| E11 |
Boiler displays E11 and shuts down immediately after call for heat
|
Blocked Air Intake / Combustion Air Fault | View Details |
| E12 |
Boiler shows E12 and will not start the burner fan
|
Fan / Blower Failure | View Details |
| E13 |
Boiler displays E13 and shuts down during operation
|
Condensate Drain Blocked | View Details |
| E14 |
Boiler shows E14 and will not fire, often after venting work
|
Air Pressure Switch Open / Proving Failure | View Details |
| E15 |
Boiler displays E15 and locks out, often with very high temperature reading
|
Overheat / Safety Thermostat Trip | View Details |
| E16 |
Boiler shows E16 and will not respond to thermostat, display may show abnormal room temperature
|
Room / Indoor Sensor Fault (if equipped) | View Details |
| E17 |
Boiler displays E17 and locks out, often after a power surge or lightning storm
|
Internal Control Board Fault | View Details |
| E18 |
Boiler shows E18 and may continue to run at reduced output
|
Modulation / Gas Valve Control Fault | View Details |
| E19 |
Boiler displays E19 and will not start, often after wiring changes
|
Thermostat / Call for Heat Input Fault | View Details |
| E2 |
Boiler shows E2 and shuts down shortly after ignition attempt
|
Flame Loss During Run | View Details |
| E20 |
Boiler shows E20 and may shut down intermittently
|
Power Supply / Line Voltage Fault | View Details |
| E3 |
Boiler displays E3 and will not fire, circulator may run
|
High Limit Temperature Lockout | View Details |
| E4 |
Boiler shows E4 and shuts down before or during ignition
|
Exhaust / Flue Temperature Fault | View Details |
| E5 |
Boiler control displays E5 and unit will not start
|
Low Water Pressure / Low System Water | View Details |
| E6 |
Boiler shows E6 and shuts down, often accompanied by gurgling sounds in piping
|
Low Water Flow / Flow Switch Open | View Details |
| E7 |
Boiler displays E7 and will not respond to thermostat calls
|
Communication Error Between User Interface and Main Control | View Details |
| E8 |
Boiler shows E8 and shuts down, often after running for a short period
|
Return Water Temperature Sensor Fault | View Details |
| E9 |
Boiler displays E9 and will not fire, may show abnormal supply temperature reading
|
Supply Water Temperature Sensor Fault | View Details |
| – |
Boiler burner makes a roaring or rumbling noise during operation
|
Combustion Noise / Improper Combustion | View Details |
| – |
Boiler circulator pump is very hot to the touch and system is not heating
|
Seized or Failed Circulator Pump | View Details |
| – |
Boiler cycles on and off when only domestic hot water is used (combi models), with temperature swings at taps
|
DHW Flow Control / Minimum Flow Issue | View Details |
| – |
Boiler display is on but unresponsive, buttons do not change settings
|
User Interface / Keypad Failure | View Details |
| – |
Boiler emits a burning plastic or electrical smell during operation
|
Overheating Electrical Component | View Details |
| – |
Boiler frequently locks out during very cold weather, then restarts after reset
|
Cold Weather / Freeze-Related Issues | View Details |
| – |
Boiler ignites with a loud bang or pop (delayed ignition)
|
Delayed Ignition | View Details |
| – |
Boiler makes loud banging or knocking noises when firing or shortly after
|
Kettling / Boiling in Heat Exchanger | View Details |
| – |
Boiler operates but flue gases or exhaust smell are noticeable in the boiler room
|
Flue Gas Leakage | View Details |
| – |
Boiler or nearby piping emits a constant gurgling or trickling water sound
|
Air in System / Air Lock | View Details |
| – |
Boiler pressure rises excessively when heating, relief valve opens and discharges water
|
Over-Pressurization of Hydronic System | View Details |
| – |
Boiler runs but does not heat the house adequately, radiators lukewarm
|
Insufficient Boiler Output / Underfiring | View Details |
| – |
Boiler runs but domestic hot water is insufficient or fluctuates (on Utica combi or with indirect tank)
|
Domestic Hot Water Performance Issue | View Details |
| – |
Boiler runs continuously and overshoots thermostat setting, house becomes too warm
|
Boiler Fails to Shut Off on Temperature | View Details |
| – |
Boiler short cycles, turning on and off frequently without long run times
|
Short Cycling / Control or System Imbalance | View Details |
| – |
Boiler will not start at all, no display or lights on Utica control
|
No Power to Boiler | View Details |
| – |
Strong gas smell near the Utica boiler, especially during or after ignition attempts
|
Gas Leak or Incomplete Ignition | View Details |
| – |
Water leaking from the bottom of the Utica boiler cabinet
|
Boiler or Piping Water Leak | View Details |
No matching codes found
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