NTI TRX II Series Installation Start-Up Maintenance page 99

Display Error code Error Description
106
Return temperature is hotter
1 06*
than the supply temperature
by 18F
1 07 Controller Software problem
1 08 Water pressure too low.
Supply sensor short circuit or
1 10
open circuit
TRX Series 2 - Installation - Startup - Maintenance Instructions
Possible cause
based on priority
Reset the error by tapping the reset button
Ensure boiler is free of air and pressurized to at least
Air in the system
20PSI
If the problem occurs during heating and hot water
Failed internal circulator/ demands, ensure return filter is clear, and the internal
internal circulator not pump is operating properly (blue light on solid) Verify
powered the pump has 120VAC with the heating or hot water
call is active
Plugged plate heat If problem occurs during hot water demands only,
exchanger(combi only)/ check the plate exchanger (combi boilers only) or
indirect hot water tank 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
Improper piping or boiler
(upper position) See diverting valve stuck, ensure the
commissioning
piping matches the instructions in the installation
manual for that specific model.
Swap the inlet and outlet sensors and verify that the
Damaged/ Malfunctioning sensors read correctly in both positions. If the sensors
temperature sensor differ by more than 5F, replace the sensors, check for
water damage or corrosion on sensors.
Reset the error by tapping the reset button. Check
Control versions prior to
menu 8.5.5. if the software version is 00.44.03 or
00.85.00
00.44.01 replace the PCB.
Raise the system pressure, with the boiler and heating
Water Pressure too low
circulators off, to a minimum of 20PSI.
Air in the system / lack of Ensure boiler is free of air and pressurized to at least
water pressure 20PSI
Ensure there are no pumps or check valves in the hot
Improper boiler piping water or heating system piping unless they are shown
in the installation manual.
Improper expansion tank Ensure the expansion tank is in the correct location
location according to the piping diagram in the manual.
If the system is filled to at least 20 PSI and the problem
Malfunctioning pressure
persists test the pressure switch wires for continuity
switch or bad wire harness
and good connections, replace the pressure switch.
Check for proper flow during heating an hot water
Blocked plate exchanger or demands, when the piping is clear the boiler can
return filter maintain a delta of 40F or lower at full fire. A higher
delta T indicates a lack of water flow.
Ensure the supply sensor (near the top of the heat
Temperature sensor
exchanger) is connected to the two red wires and it
disconnected
securely clipped on the outlet pipe.
Check the supply sensor for water damage, try
swapping the supply and return temperature sensors.
Faulty Temperature Sensor
Check sensor resistance see temperature/ resistance
chart.
Inspect the wiring between the supply sensor and
Damaged sensor wiring PCB, check for continuity, corrosion and water
damage, ensure connectors are plugged in properly
Part 13 - Troubleshooting
Possible Remedies
Error
Type
Blocking
(Manual
Reset)
Blocking
(Manual
Reset)
Blocking
(Auto
Reset)
Blocking
(Auto
Reset)
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