Trinity
│
Installation and Operation Instructions
Tx Series
70
Code
Description
Loc 28
Flame present before ignition
– check flame sensor (replace); check condensate drain for blockages;
increase post purge setting (Installer Menu setting 2-30).
Loc 29 & up
Controller Malfunction
– contact NTI, replace controller.
Err 45-51
Controller Malfunction
– contact NTI, replace controller.
Err 52
Incorrect Field Wiring –
check electrical connections to field terminal strip; ensure the Thermostat is
connected to terminals 7 and 8.
Err 53
Controller Malfunction
– contact NTI, replace controller.
Err 54
Flame detected out of sequence
– check/replace flame sensor; check flame sensor wiring; check
condensate drain for blockages; replace controller.
Err 55-60
Controller Malfunction
– contact NTI, replace controller.
Err 61
Return Sensor Error
– check wiring to return sensor; replace sensor [see Figure 19-1(d), item 24].
Err 62-64
Controller Malfunction
– contact NTI, replace controller.
Err 65
Incorrect Polarity
– controller has sensed reversed polarity of the 120VAC power supply; check field
wiring to L2 NEUTRAL (terminals 12 &13) and L1 120VAC (terminal 14). There should be 120VAC
potential between L1 120VAC and ground, and 0VAC potential between L2 NEUTRAL and ground.
Err 66
Incorrect Frequency –
the controller accepts a line voltage frequency of 60Hz ± 2%; if outside this range
the controller may be damaged or function incorrectly. If using a generator as a power source, install a UPS
(uninterruptible power supply) between the generator and boiler.
Err 67
Faulty Earth Ground
– check grounding of boiler and power supply; replace controller.
Err 68-71
Controller Malfunction
– contact NTI, replace controller.
Err 72
Supply Sensor Open
– check wiring to supply sensor; replace sensor [see Figure 19-1(a), item 15].
Err 73
Return Sensor Open
– check wiring to return sensor; replace sensor [see Figure 19-1(d), item 24].
Err 74-77
Controller Malfunction
– contact NTI, replace controller.
Err 78
Flue Sensor Open –
check wiring to flue sensor; replace sensor [see Figure 19-1(d), item 24].
Err 79
Controller Malfunction
– contact NTI, replace controller.
Err 80
Supply Sensor Shorted
– check wiring to supply sensor; replace sensor [see Figure 19-1(a), item 15].
Err 81
Return Sensor Shorted
– check wiring to return sensor; replace sensor [see Figure 19-1(d), item 24].
Err 82-85
Controller Malfunction
– contact NTI, replace controller.
Err 86
Flue Sensor Shorted
– check wiring to flue sensor; replace sensor [see Figure 19-1(d), item 24].
Err 87 & up
Controller Malfunction
– contact NTI, replace controller.
Att 3
DHW Sensor Open –
controller has sensed an open circuit at the DHW tank sensor; check wiring to
terminals 3 and 6 and tank sensor. If no tank sensor is being used, set DHW Mode (setting 2-08) to the
appropriate setting; see Table 17-2.
Att 4
DHW Sensor Shorted –
controller has sensed a short circuit at the DHW tank sensor; check wiring to
terminals 3 and 6 and tank sensor. If no tank sensor is being used, set DHW Mode (setting 2-08) to the
appropriate setting; see Table 17-2.
Att 6
Warm Weather Shutdown (WWSD) Active –
when the outdoor temperature (menu reading 1-08)
exceeds the WWSD setting (menu setting 2-04), “Att 6” is displayed during central heat demands, and the
boiler only responds to DHW demands. To avoid this error, increase menu setting 2-04.
Att 7
Service Reminder –
occurs every 365 days; service the boiler and clear the warning by adjusting menu
setting 2-16 to “OFF”.
FILL
Low Water Pressure
– increase system water pressure to a minimum of 12psi. If water pressure reading at
the external pressure gauge exceeds 15psi, inspect water pressure sensor and cable – replace water pressure
sensor [see Figure 19-1(d), item 24].
Notes:
1
While displaying a lockout or blocking error, the User and Installer Menus can be accessed to view the status of boiler
sensors and settings.
2
Blocking errors (Err) and some lockouts (Loc) will not clear until the fault is correct.
3
Some lockouts (Loc) can only be cleared by holding the RESET button on the display console.
