NTI INSTALLATION MANUALS

Part 13 - Troubleshooting

Display Error code

Possible cause based on priority

Error Type

Error Description

Possible Remedies

Reset the error by tapping the reset button

Air in the system

Ensure boiler is free of air and pressurized to at least 20PSI

"If the problem occurs during heating and hot water demands, ensure return lter is clear, and the internal pump is operating properly (blue light on solid) Verify the pump has 120VAC with the heating or hot water call is active" If problem occurs during hot water demands only, check the plate exchanger (combi boilers only) or indirect hot water tank and plumbing for a blockage. If not using the DHW connection ensure the diverting valve is moving freely and is in the heating position (upper position) See diverting valve stuck, ensure the piping matches the instructions in the installation manual for that speci c model. Swap the inlet and outlet sensors and verify that the sensors read correctly in both positions. If the sensors di er by more than 5F, replace the sensors, check for water damage or corrosion on sensors. If the problem occurs during heating and hot water demands, ensure return lter is clear, and the internal pump is operating properly (blue light on solid) Verify the pump has 120VAC with the heating or hot water call is active If problem occurs during hot water demands only, check the plate exchanger (combi boilers only) or indirect hot water tank and plumbing for a blockage. If not using the DHW connection ensure the diverting valve is moving freely and is in the heating position (upper position) See diverting valve stuck, ensure the piping matches the instructions in the installation manual for that speci c model. Swap the inlet and outlet sensors and verify that the sensors read correctly in both positions. If the sensors di er by more than 5F, replace the sensors, check for water damage or corrosion on sensors. Compare the resistance of the sensor to the temperature resistance chart. Check menu 8.5.5. if the software version is 00.44.03 or 00.44.01 replace the PCB. If the problem occurs during heating and hot water demands, ensure return lter is clear, and the internal pump is operating properly (blue light on solid) Verify the pump has 120VAC with the heating or hot water call is active If problem occurs during hot water demands only, check the plate exchanger (combi boilers only) or indirect hot water tank and plumbing for a blockage. If not using the DHW connection ensure the diverting valve is moving freely and is in the heating position (upper position) See diverting valve stuck, ensure the piping matches the instructions in the installation manual for that speci c model. Swap the inlet and outlet sensors and verify that the sensors read correctly in both positions. If the sensors di er by more than 5F, replace the sensors, check for water damage or corrosion on sensors. Reset the error by tapping the reset button Ensure boiler is free of air and pressurized to at least 20PSI Reset the error by tapping the reset button Ensure boiler is free of air and pressurized to at least 20PSI

Failed internal circulator/ internal circulator not powered

Plugged plate heat exchanger(combi only)/ indirect hot water tank

"Blocking (Manual Reset)"

104- Supply temperature rose faster than 27 degrees per second

1 04*

Improper piping or boiler commissioning

Damaged/ Malfunctioning temperature sensor

Air in the system

Failed internal circulator/ internal circulator not powered

Plugged plate heat exchanger(combi only)/ indirect hot water tank

105- Supply temperature exceeded return tempera ture by more than 99F three times in a row.

Blocking (Manual Reset)

1 05*

Improper piping or boiler commissioning

Damaged/ Malfunctioning temperature sensor

PCB failure

Air in the system

Failed internal circulator/ internal circulator not powered Plugged plate heat exchanger(combi only)/ indirect hot water tank

Blocking (Manual Reset)

106- Return temperature is hotter than the supply temperature by 18F

1 06*

Improper piping or boiler commissioning

Damaged/ Malfunctioning temperature sensor

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