Triangle Tube
Triangle Tube Boilers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
Advertisements
E01
Boiler will not fire, display shows E01 lockout
Ignition Failure Lockout
E02
Boiler shuts down with E02; no flame is proven after an ignition attempt.
Flame Detection Failure
E03
Boiler locks out with E03; no ignition spark is observed.
Ignition Spark Circuit Failure
E04
Boiler displays E04 and will not start; the fan may run briefly then stop.
Air Pressure Switch / Combustion Air Fault
E05
Boiler shows E05; the fan runs but the burner does not light.
Fan Speed / Combustion Blower Fault
E06
Boiler locks out with E06; the temperature reading is erratic or out of range.
Supply Temperature Sensor (NTC) Fault
E07
Boiler displays E07; the return temperature reading is invalid.
Return Temperature Sensor (NTC) Fault
E08
Boiler shows E08; the domestic hot water (DHW) temperature reading is incorrect or missing.
DHW Temperature Sensor Fault
E09
Boiler locks out with E09; the high limit temperature has been exceeded.
High Limit Overheat Trip
E10
Boiler shows E10; low water pressure or lack of water in the system.
Low Water Pressure / Low Water Cutoff
E11
Boiler displays E11; flue gas temperature is too high.
Flue Gas Overtemperature
E12
Boiler displays E12: communication error between display and main control.
Control Board Communication Fault
E13
Boiler displays E13: outdoor temperature sensor reading is invalid.
Outdoor Sensor Fault
E14
Boiler displays E14: domestic hot water flow is detected, but the burner does not modulate correctly.
DHW Flow Sensor / Flow Switch Fault
E15
Boiler locks out with E15: condensate system fault detected.
Condensate Drain Blockage
E16
Boiler displays E16: gas valve or gas train fault.
Gas Valve Control Error
E17
Boiler displays E17: internal pump or primary circulator fault.
Internal Circulator Pump Failure
E18
Boiler displays E18: flame present when there should be no flame.
False Flame Detection
E19
Boiler displays E19: supply/return temperature difference too high.
Delta-T Too High / Insufficient Flow
E20
Boiler displays E20: supply/return temperature difference too low.
Delta-T Too Low / Excessive Flow or Sensor Error
Symptom
Boiler cabinet is very hot to the touch; insulation may smell or discolor.
Overheating Cabinet / Insulation Issue
Symptom
Boiler cycles on and off rapidly when only a small zone is calling for heat.
Micro-Zoning / Minimum Firing Rate Mismatch
Symptom
Boiler display is blank; no lights or response from controls.
No Power to Boiler
Symptom
Boiler display is on but unresponsive; buttons do not change settings.
User Interface / Keypad Failure
Symptom
Boiler emits a strong exhaust or burning smell near the unit.
Combustion / Venting Odor Issue
Symptom
Boiler fan runs continuously even when there is no call for heat.
Fan Stuck On / Post-Purge Control Issue
Symptom
Boiler frequently locks out during very cold weather but runs fine in mild temperatures.
Cold Weather Performance / Intake or Condensate Issue
Symptom
Boiler frequently releases water from the pressure relief valve.
Overpressure / Expansion Problem
Symptom
Boiler ignites with a loud boom or puff back.
Delayed Ignition
Symptom
Boiler leaking water from the bottom of the cabinet.
Internal Water Leak
Symptom
Boiler makes loud banging or knocking noises when starting or stopping.
Kettling / Water Hammer in Hydronic System
Symptom
Boiler runs but makes a high-pitched whine from the fan area.
Combustion Fan Bearing or Airflow Noise
Symptom
Boiler runs but the house does not reach the set temperature; radiators are lukewarm.
Insufficient Heat Output
Symptom
Boiler short cycles, turning on and off frequently without maintaining steady operation.
Short Cycling / Control or Sizing Issue
Symptom
Domestic hot water temperature fluctuates, alternating between hot and cold.
Inconsistent DHW Temperature
Symptom
No domestic hot water, but space heating works normally.
DHW Priority / Diverter Fault
Symptom
No heat to radiators or underfloor loops, but the boiler appears to run.
No Space Heating Circulation
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Boiler will not fire, display shows E01 lockout
|
Ignition Failure Lockout | View Details |
| E02 |
Boiler shuts down with E02; no flame is proven after an ignition attempt.
|
Flame Detection Failure | View Details |
| E03 |
Boiler locks out with E03; no ignition spark is observed.
|
Ignition Spark Circuit Failure | View Details |
| E04 |
Boiler displays E04 and will not start; the fan may run briefly then stop.
|
Air Pressure Switch / Combustion Air Fault | View Details |
| E05 |
Boiler shows E05; the fan runs but the burner does not light.
|
Fan Speed / Combustion Blower Fault | View Details |
| E06 |
Boiler locks out with E06; the temperature reading is erratic or out of range.
|
Supply Temperature Sensor (NTC) Fault | View Details |
| E07 |
Boiler displays E07; the return temperature reading is invalid.
|
Return Temperature Sensor (NTC) Fault | View Details |
| E08 |
Boiler shows E08; the domestic hot water (DHW) temperature reading is incorrect or missing.
|
DHW Temperature Sensor Fault | View Details |
| E09 |
Boiler locks out with E09; the high limit temperature has been exceeded.
|
High Limit Overheat Trip | View Details |
| E10 |
Boiler shows E10; low water pressure or lack of water in the system.
|
Low Water Pressure / Low Water Cutoff | View Details |
| E11 |
Boiler displays E11; flue gas temperature is too high.
|
Flue Gas Overtemperature | View Details |
| E12 |
Boiler displays E12: communication error between display and main control.
|
Control Board Communication Fault | View Details |
| E13 |
Boiler displays E13: outdoor temperature sensor reading is invalid.
|
Outdoor Sensor Fault | View Details |
| E14 |
Boiler displays E14: domestic hot water flow is detected, but the burner does not modulate correctly.
|
DHW Flow Sensor / Flow Switch Fault | View Details |
| E15 |
Boiler locks out with E15: condensate system fault detected.
|
Condensate Drain Blockage | View Details |
| E16 |
Boiler displays E16: gas valve or gas train fault.
|
Gas Valve Control Error | View Details |
| E17 |
Boiler displays E17: internal pump or primary circulator fault.
|
Internal Circulator Pump Failure | View Details |
| E18 |
Boiler displays E18: flame present when there should be no flame.
|
False Flame Detection | View Details |
| E19 |
Boiler displays E19: supply/return temperature difference too high.
|
Delta-T Too High / Insufficient Flow | View Details |
| E20 |
Boiler displays E20: supply/return temperature difference too low.
|
Delta-T Too Low / Excessive Flow or Sensor Error | View Details |
| – |
Boiler cabinet is very hot to the touch; insulation may smell or discolor.
|
Overheating Cabinet / Insulation Issue | View Details |
| – |
Boiler cycles on and off rapidly when only a small zone is calling for heat.
|
Micro-Zoning / Minimum Firing Rate Mismatch | View Details |
| – |
Boiler display is blank; no lights or response from controls.
|
No Power to Boiler | View Details |
| – |
Boiler display is on but unresponsive; buttons do not change settings.
|
User Interface / Keypad Failure | View Details |
| – |
Boiler emits a strong exhaust or burning smell near the unit.
|
Combustion / Venting Odor Issue | View Details |
| – |
Boiler fan runs continuously even when there is no call for heat.
|
Fan Stuck On / Post-Purge Control Issue | View Details |
| – |
Boiler frequently locks out during very cold weather but runs fine in mild temperatures.
|
Cold Weather Performance / Intake or Condensate Issue | View Details |
| – |
Boiler frequently releases water from the pressure relief valve.
|
Overpressure / Expansion Problem | View Details |
| – |
Boiler ignites with a loud boom or puff back.
|
Delayed Ignition | View Details |
| – |
Boiler leaking water from the bottom of the cabinet.
|
Internal Water Leak | View Details |
| – |
Boiler makes loud banging or knocking noises when starting or stopping.
|
Kettling / Water Hammer in Hydronic System | View Details |
| – |
Boiler runs but makes a high-pitched whine from the fan area.
|
Combustion Fan Bearing or Airflow Noise | View Details |
| – |
Boiler runs but the house does not reach the set temperature; radiators are lukewarm.
|
Insufficient Heat Output | View Details |
| – |
Boiler short cycles, turning on and off frequently without maintaining steady operation.
|
Short Cycling / Control or Sizing Issue | View Details |
| – |
Domestic hot water temperature fluctuates, alternating between hot and cold.
|
Inconsistent DHW Temperature | View Details |
| – |
No domestic hot water, but space heating works normally.
|
DHW Priority / Diverter Fault | View Details |
| – |
No heat to radiators or underfloor loops, but the boiler appears to run.
|
No Space Heating Circulation | View Details |
No matching codes found
Advertisements