NTI TRX II Series Installation Start-Up Maintenance page 100

Part 13 - Troubleshooting
Display Error code Error Description
CH Return temp. sensor
1 12 circuit open / short
circuit
Outdoor sensor not con-
1 14
nected
115
System sensor Disconnected
Floor Thermostat contact
1 16
open
150 System Sensor Overheat
Boiler temperature rose
1 P1
faster than 12.6F / second
Supply temperate exceeded
1 P2
return by 99F or more
100
Possible cause
based on priority
Ensure the return sensor (near the bottom of the heat
Temperature sensor
exchanger) is connected to the two blue wires and it
disconnected
securely clipped on the outlet pipe.
Check the return 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 return sensor and
Damaged sensor wiring PCB, check for continuity, corrosion and water
damage, ensure connectors are plugged in properly
Outdoor reset turned on (but If not using outdoor reset, ensure Menu 4.2.1, 5.2.1
not used) and 6.2.1 are set to 0.
If using Wi-Fi the boiler gets the outdoor temperature
WIFI disconnected from the web. The website may be down or the WIFI
has become disconnected
In a cascade the system sensor must be connected to
System sensor disconnected the master boiler, connect the system sensor to the
master boiler using the SYS plug connection.
If the boiler is set to work in a cascade the system
Menu 0.46 improperly set sensor must be connected to the master boiler. If not
running in a cascade set parameter 0.4.6 to b-Sin.
Check the system sensor for water damage and
Faulty Temperature Sensor disconnected wiring . Check sensor resistance see
or wiring temperature/ resistance chart. Ensure the system
sensor is connected to the master boiler.
If not using a floor sensor set parameter 223 is set to 0.
Incorrect setting If parameter 223 is set to 1 and a floor safety
thermostat is present reduce the CH set-point.
Verify that the 3 way valve operates freely between
3-way valve stuck
central heat and DHW. See diverting valve stuck.
Floor sensor set too low, adjust setting correctly. If
Floor sensor open circuit the floor sensor is set correctly verify proper system
operation.
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.
Check the system sensor for water damage, Check
Faulty Temperature Sensor
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.
In systems with high and low temperature zones this
error may be displayed for serval minutes as zones
Normal operation
turn on and off. If the error goes away on its own, the
system it working properly.
If there is insufficient circulation a lockout error will
Potential Plumbing problem
result , follow directions for that lockout.
In systems with high and low temperature zones this
error may be displayed for serval minutes as zones
Normal operation
turn on and off. If the error goes away on its own, the
system it working properly.
If there is insufficient circulation a lockout error will
Potential Plumbing problem
result , follow directions for that lockout.
Possible Remedies
420012001300 - Rev. 04 - 031524
Error
Type
Blocking
(Auto
Reset)
Blocking
(Auto
Reset)
Blocking
(AUTO
Reset)
Warning
(Auto
reset)
Warning
Warning