NTI INSTALLATION MANUALS

Part 13 - Troubleshooting

General symptoms

Possible cause based on priority

Symptoms

Possible Remedies

Do not hold the reset button, brei y press and relase (TAP) the button to reset a lockout. Remove and reinstall the PCB from the display housing, ensure the PCB is held by the clips. If the 3 way valve becomes stuck, verify the piping per the diagram in the installation manual. Remove any pumps or check valves not shown in the diagram. To unstick the valve: Lower the boiler pressure to 5PSI or less, then unplug the boiler and plug it back in and observe that the valve moves up and down 3/8" WHILE THE BOILER STARTS UP. If not using the DHW connection, remove the diverting valve plug once the valve reaches the top of its stroke. Set Menu 2.10.6 = 1 . If menu 2.10.16 is not available replace the PCB and the Screen. Check menu 8.5.5 if the software version is: 00.44.03 or 00.44.01, 00.85.00, 00.98.00, 01.01.00 replace the PCB for system boiler Check menu 8.5.5 if the software version is: 00.44.03 or 00.44.01, 00.85.00 replace the PCB for combi boiler. Set parameter 2.1.2 = 4. Check menu 8.5.5 if the software version is: 00.44.03 or 00.44.01, 00.85.00, 00.98.00 replace the PCB.

Holding reset button

Lockout will not Reset

Reset button not working

Improper piping or boiler commissioning

3Way valve Stuck

Anti water hammer feature turned o

A harsh bang in the water piping when changing from heating to hot water

Water hammer noise

Old software

The 3 way valve seats at the end of each cycle

3Way Valve noise

Change setting 2.1.2

Heating: Boiler starts without request

Remove wiring from TT1, and TT2, If problem perists perform a factory reset with Menu 2.8.0

Incorect wiring

Table 35 - Boiler Error Codes

Important Contact a quali ed service technician for assistance if a Lockout Error occurs frequently. For safety reasons, the boiler will permit a maximum of ve (5) resets in 15 minutes ( ve [5] presses of the RESET button). A sixth (6th) attempt within this 15 minute period will lock out the boiler permanently. The boiler will only operate again after the electrical supply has been disconnected and reconnected. Repeated Lockout Error conditions could indicate a serious error with the boiler or installation. Failure to contact a quali ed service technician to troubleshoot the error could result in substantial property damage, serious personal injury, or death. *Error is resettable remotely via NTI Tele-Diagnostic Service, NTI Remote Contractor.

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