Display Menu Guide
│
Tx I&O Manual
70
Code
Description
Err 87
Reset Button Error
– controller has sensed that the “Reset” button (see Figure 17.2) is stuck, inspect
button, try pressing and releasing it to “unstick” it, if necessary remove plastic overlay from display.
Turn power off and on, if problem persists, replace display.
Err 88-92
Controller Malfunction
– contact NTI, check field wiring, replace controller.
Err 93
Appliance Type –
the appliance type stored in the display does not match the appliance type stored in the
controller. Set the appropriate appliance type using the procedure described under “Controller
Replacement Instructions”; see page 73.
Err 94 & up
Controller Malfunction
– contact NTI, check field wiring, replace controller.
Afro
Anti-Frost –
indicates that the boiler is in Frost Protection. When the controller has sensed a supply or
return temperature below 50
°
F, the Boiler and CH Pumps are switched ON. If the temperature drops
below 41
°
F the burner is started and operates at minimum modulation until both the supply and return
temperatures reach 60
°
F.
Att 2
Outdoor Sensor Shorted –
controller has sensed a short circuit at the Outdoor sensor; check wiring to
terminals 3 and 5 and outdoor sensor.
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. If the
indicated temperature reading does not match the actual outdoor temperature, inspect the outdoor sensor
wiring. If wiring is fine, disconnect the outdoor sensor, menu reading 1-08 should indicate “OPEn”, if
not, replace the controller, if “OPEn” is indicated replace the outdoor sensor.
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 12 PSI. If water pressure reading
at the external pressure gauge exceeds 15 PSI, inspect water pressure sensor and cable; if water pressure
sensor is dirty, gently clean with a calcium/rust remover. If necessary, replace water pressure sensor
[see Figure 19-1(a), 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.
