Triangle tube boiler troubleshooting

Modern boilers are equipped with sensors and elements, which control their functioning. They activate protective mechanisms, which, in turn, prevent things from getting worse. If a malfunction does occur, please, check the table and troubleshoot it.


CodeLockout MessageDescription
E1Failed IgnitionThe burner failed to light after 5 ignition attempts.
E2False FlameA flame is being detected prior to ignition.
E3High Boiler TemperatureBoiler temperature has reached 210?F [99?C]
E5Blower SpeedBlower is not at correct speed or speed signal is not being received by control module.
E8Flame Circuit ErrorFlame circuit test failed.
E9Gas Valve Circuit ErrorGas valve circuit test failed.
E13Reset Limit ReachedResets are limited to 5 every 15 minutes.
E15Sensor DriftSupply or return sensor reading has drifted.
E16Supply Sensor StuckSupply sensor reading is not changing.
E17Return Sensor StuckReturn sensor reading is not changing.
E18Sensor FailureSupply or return sensor reading changed very rapidly.
E21Internal Control FaultA / D conversion error.
E30Supply Sensor ShortedA short circuit has been detected in the boiler supply temperature sensor circuit.
E31Supply Sensor Open
E43Return Sensor Shorted
E44Return Sensor Open
E80Return > SupplyReturn temperature is higher than supply temperature.
E87External Limit OpenAn external manual reset limit has opened
E7High Flue TemperatureFlue temperature exceeds high limit.
E12Internal Control FaultEEPROM misconfiguration
E25Internal Control FaultCRC check error.
E32DHW Sensor ShortedA short circuit has been detected in the DHW temperature sensor circuit.
E33DHW Sensor OpenAn open circuit has been detected in the DHW temperature sensor circuit.
E34Low VoltageLine voltage has fallen below an acceptable operating level.
E37Low WaterWater level has fallen below an acceptable operating level.
E45Flue Sensor ShortedA short circuit has been detected in the boiler flue temperature sensor circuit.
E46Flue Sensor OpenAn open circuit has been detected in the boiler flue temperature sensor circuit.
E76External Limit OpenAn external automatic reset boiler limit has opened.
E81Sensor DriftSupply and return temperatures are not equal.
E89Incorrect SettingA parameter setting is in conflict with another setting.
E90Firmware MismatchControl module and display firmware versions are incompatible.
E91System Sensor ShortedA short circuit has been detected in the system temperature sensor circuit.
E92System Sensor OpenAn open circuit has been detected in the system temperature sensor circuit.
E93Outdoor Sensor Shorted
E94Internal Display FaultDisplay memory error.
E95Supply Sensor ErrorSupply sensor reading is invalid.
E96Outdoor Sensor OpenAn open circuit has been detected in the outdoor temperature sensor circuit.
E97Cascade MismatchCascade configuration has changed.
E98Cascade Bus ErrorCommunication with other boilers has been lost.
E99Controller Bus ErrorCommunication between boiler display and control module has been lost.