NTI VM110 - Page 69

Vmax I&O Manual │Display Menu Guide
69
Code
Description
Err 65
Incorrect Polarity – controller has sensed reversed polarity of the 120VAC power supply; check field
wiring to L2 NEUTRAL (terminals 14 &15) and L1 120VAC (terminal 16). 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, check field wiring, replace controller.
Err 72
Supply Sensor Open – check wiring to supply sensor; replace sensor [see Figure 19-1(a), item 15].
Err 73
Supply Sensor Fault – check wiring to supply sensor; replace sensor [see Figure 19-1(a), item 15].
Err 74-77
Controller Malfunction – contact NTI, check field wiring, replace controller.
Err 78
Flue Sensor Open – check wiring to flue sensor; replace sensor [see Figure 19-1(a), item 20].
Err 79
Controller Malfunction – contact NTI, check field wiring, replace controller.
Err 80
Supply Sensor Shorted – check wiring to supply sensor; replace sensor [see Figure 19-1(a), item 15].
Err 81
Supply Sensor Shorted – check wiring to supply sensor; replace sensor [see Figure 19-1(a), item 15].
Err 82-85
Controller Malfunction – contact NTI, check field wiring, replace controller.
Err 86
Flue Sensor Shorted – see Err 60.
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.
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.