Triangle Tube
Triangle Tube Water Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E02
Water heater locks out with E02 on display, burner does not ignite, circulator may run briefly then stop.
Ignition Failure / No Flame Detected
E03
Unit displays E03 and shuts down; burner stops shortly after ignition attempt or will not light at all.
Flame Loss During Operation
E04
Display shows E04 and the water heater will not fire; fan may run briefly then stop.
Air Pressure Switch / Combustion Air Proving Fault
E05
E05 displayed, unit shuts down or will not start; may occur after overheating or poor circulation.
High Limit Temperature Lockout
E06
E06 on display, unit will not fire; temperature readings may be erratic or show unrealistic values.
Supply Temperature Sensor Fault (NTC Open/Short)
E07
E07 displayed, unit may run briefly then shut down; return temperature reading appears incorrect.
Return Temperature Sensor Fault (NTC Open/Short)
E08
E08 error, unit shuts down; may occur during domestic hot water draw or high load conditions.
Domestic Hot Water (DHW) Sensor Fault
E09
E09 displayed, unit may not respond to thermostat or control inputs correctly.
Flow Sensor / Flow Switch Fault
E10
E10 on display, unit will not fire; pressure gauge may read low or zero.
Low Water Pressure / Low System Fill
E11
E11 displayed, unit may shut down unexpectedly; pressure reading may be abnormally high.
High Water Pressure / Overpressure Fault
E12
E12 error, unit may not respond to thermostat or may run without proper control.
External Control / Thermostat Input Fault
E13
E13 displayed, unit may lock out; often associated with flue or combustion issues.
Flue Gas Overtemperature / Flue Sensor Fault
E14
E14 error, unit may not modulate correctly or may shut down under high load.
Fan Speed / Combustion Blower Fault
E15
E15 displayed, unit may not fire or may shut down intermittently.
Gas Valve Control Fault
E16
E16 error, unit may lock out; often associated with condensate or blocked heat exchanger.
Condensate Drain / Blocked Heat Exchanger Fault
E17
E17 displayed, unit may not modulate correctly or may shut down under certain conditions.
Modulation / Fan-Gas Ratio Control Fault
E18
E18 error, unit may not start; often associated with internal communication issues.
Internal Control Communication Fault
E19
E19 displayed, unit may lock out; often related to sensor calibration or configuration.
Configuration / Parameter Error
E20
E20 error, unit may shut down during operation; often associated with return temperature or delta-T issues.
Excessive Temperature Differential / Flow Imbalance
Symptom
Condensate drain repeatedly clogs, causing water to back up into the Triangle Tube water heater.
Recurring Condensate Blockage
Symptom
Display shows normal operation but radiators or space heating zones remain cold while DHW works correctly.
No Space Heating / DHW Only Operation
Symptom
Domestic hot water runs out quickly; Triangle Tube water heater recovers slowly or cannot keep up with demand.
Insufficient DHW Capacity / Recovery
Symptom
No hot water at taps, Triangle Tube water heater appears powered but burner does not run when hot water is demanded.
Domestic Hot Water Demand Not Detected
Symptom
Noticeable banging, knocking, or kettling noises from the Triangle Tube water heater during firing.
Boiling / Kettling Due to Scale or Poor Flow
Symptom
Odor of rotten eggs or sulfur from hot water taps supplied by the Triangle Tube system.
Bacterial Growth / Anode Reaction in DHW Tank
Symptom
Pressure relief valve on the Triangle Tube water heater drips or discharges water periodically.
Relief Valve Discharge / Overpressure or Overtemperature
Symptom
Strong exhaust or burning smell near the Triangle Tube water heater, especially during operation.
Combustion Gas Leakage / Incomplete Combustion
Symptom
Triangle Tube water heater display shows temperature but buttons do not respond or respond erratically.
Unresponsive User Interface
Symptom
Triangle Tube water heater frequently reaches high limit and shuts down when multiple zones call for heat.
Flow Imbalance / Piping Design Issue
Symptom
Triangle Tube water heater locks out intermittently without a clear pattern; sometimes resets and runs normally.
Intermittent Lockout / Nuisance Shutdown
Symptom
Triangle Tube water heater runs but hot water output is lukewarm or cooler than setpoint.
Insufficient DHW Temperature
Symptom
Triangle Tube water heater will not power on; display is blank and no lights are visible.
No Power / Control Not Energized
Symptom
Visible corrosion or rust on piping and fittings around the Triangle Tube water heater.
External Corrosion / Atmospheric Attack
Symptom
Water heater frequently short cycles, turning on and off rapidly even with demand present.
Short Cycling / Oversized or Miscontrolled System
Symptom
Water heater produces hot water but temperature fluctuates, alternating between very hot and lukewarm during a shower.
Inconsistent DHW Temperature / Short Cycling
Symptom
Water heater vibrates excessively or makes loud humming or rattling noises during operation.
Mechanical Vibration / Mounting Issue
Symptom
Water leaking from the bottom of the Triangle Tube water heater cabinet or from piping connections.
System or DHW Water Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E02 |
Water heater locks out with E02 on display, burner does not ignite, circulator may run briefly then stop.
|
Ignition Failure / No Flame Detected | View Details |
| E03 |
Unit displays E03 and shuts down; burner stops shortly after ignition attempt or will not light at all.
|
Flame Loss During Operation | View Details |
| E04 |
Display shows E04 and the water heater will not fire; fan may run briefly then stop.
|
Air Pressure Switch / Combustion Air Proving Fault | View Details |
| E05 |
E05 displayed, unit shuts down or will not start; may occur after overheating or poor circulation.
|
High Limit Temperature Lockout | View Details |
| E06 |
E06 on display, unit will not fire; temperature readings may be erratic or show unrealistic values.
|
Supply Temperature Sensor Fault (NTC Open/Short) | View Details |
| E07 |
E07 displayed, unit may run briefly then shut down; return temperature reading appears incorrect.
|
Return Temperature Sensor Fault (NTC Open/Short) | View Details |
| E08 |
E08 error, unit shuts down; may occur during domestic hot water draw or high load conditions.
|
Domestic Hot Water (DHW) Sensor Fault | View Details |
| E09 |
E09 displayed, unit may not respond to thermostat or control inputs correctly.
|
Flow Sensor / Flow Switch Fault | View Details |
| E10 |
E10 on display, unit will not fire; pressure gauge may read low or zero.
|
Low Water Pressure / Low System Fill | View Details |
| E11 |
E11 displayed, unit may shut down unexpectedly; pressure reading may be abnormally high.
|
High Water Pressure / Overpressure Fault | View Details |
| E12 |
E12 error, unit may not respond to thermostat or may run without proper control.
|
External Control / Thermostat Input Fault | View Details |
| E13 |
E13 displayed, unit may lock out; often associated with flue or combustion issues.
|
Flue Gas Overtemperature / Flue Sensor Fault | View Details |
| E14 |
E14 error, unit may not modulate correctly or may shut down under high load.
|
Fan Speed / Combustion Blower Fault | View Details |
| E15 |
E15 displayed, unit may not fire or may shut down intermittently.
|
Gas Valve Control Fault | View Details |
| E16 |
E16 error, unit may lock out; often associated with condensate or blocked heat exchanger.
|
Condensate Drain / Blocked Heat Exchanger Fault | View Details |
| E17 |
E17 displayed, unit may not modulate correctly or may shut down under certain conditions.
|
Modulation / Fan-Gas Ratio Control Fault | View Details |
| E18 |
E18 error, unit may not start; often associated with internal communication issues.
|
Internal Control Communication Fault | View Details |
| E19 |
E19 displayed, unit may lock out; often related to sensor calibration or configuration.
|
Configuration / Parameter Error | View Details |
| E20 |
E20 error, unit may shut down during operation; often associated with return temperature or delta-T issues.
|
Excessive Temperature Differential / Flow Imbalance | View Details |
| – |
Condensate drain repeatedly clogs, causing water to back up into the Triangle Tube water heater.
|
Recurring Condensate Blockage | View Details |
| – |
Display shows normal operation but radiators or space heating zones remain cold while DHW works correctly.
|
No Space Heating / DHW Only Operation | View Details |
| – |
Domestic hot water runs out quickly; Triangle Tube water heater recovers slowly or cannot keep up with demand.
|
Insufficient DHW Capacity / Recovery | View Details |
| – |
No hot water at taps, Triangle Tube water heater appears powered but burner does not run when hot water is demanded.
|
Domestic Hot Water Demand Not Detected | View Details |
| – |
Noticeable banging, knocking, or kettling noises from the Triangle Tube water heater during firing.
|
Boiling / Kettling Due to Scale or Poor Flow | View Details |
| – |
Odor of rotten eggs or sulfur from hot water taps supplied by the Triangle Tube system.
|
Bacterial Growth / Anode Reaction in DHW Tank | View Details |
| – |
Pressure relief valve on the Triangle Tube water heater drips or discharges water periodically.
|
Relief Valve Discharge / Overpressure or Overtemperature | View Details |
| – |
Strong exhaust or burning smell near the Triangle Tube water heater, especially during operation.
|
Combustion Gas Leakage / Incomplete Combustion | View Details |
| – |
Triangle Tube water heater display shows temperature but buttons do not respond or respond erratically.
|
Unresponsive User Interface | View Details |
| – |
Triangle Tube water heater frequently reaches high limit and shuts down when multiple zones call for heat.
|
Flow Imbalance / Piping Design Issue | View Details |
| – |
Triangle Tube water heater locks out intermittently without a clear pattern; sometimes resets and runs normally.
|
Intermittent Lockout / Nuisance Shutdown | View Details |
| – |
Triangle Tube water heater runs but hot water output is lukewarm or cooler than setpoint.
|
Insufficient DHW Temperature | View Details |
| – |
Triangle Tube water heater will not power on; display is blank and no lights are visible.
|
No Power / Control Not Energized | View Details |
| – |
Visible corrosion or rust on piping and fittings around the Triangle Tube water heater.
|
External Corrosion / Atmospheric Attack | View Details |
| – |
Water heater frequently short cycles, turning on and off rapidly even with demand present.
|
Short Cycling / Oversized or Miscontrolled System | View Details |
| – |
Water heater produces hot water but temperature fluctuates, alternating between very hot and lukewarm during a shower.
|
Inconsistent DHW Temperature / Short Cycling | View Details |
| – |
Water heater vibrates excessively or makes loud humming or rattling noises during operation.
|
Mechanical Vibration / Mounting Issue | View Details |
| – |
Water leaking from the bottom of the Triangle Tube water heater cabinet or from piping connections.
|
System or DHW Water Leak | View Details |
No matching codes found
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