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Troubleshooting
Table 6: N2 Bus Configuration Troubleshooting
Error/Trouble
Condition
TEC2103-2 thermostat
cycles online and
offline.
TEC2103-2 thermostat
does not come online.
Entire N2 Bus is offline.
Table 7: Alarm Messages
Display
Frost ON
Service
Filter
Note:
There is a temperature alarm message that appears at the headend control should the setpoint not be reached
within 45 minutes (there is no indication locally at the TEC2103-2 thermostat).
Possible Causes
Two or more controllers have the same
address.
There are Y or T taps or the repeater lost
power or is wired incorrectly.
Two or more controllers have the same
address.
N2 Bus contains too many devices.
TEC2103-2 thermostat does not have
power.
N2 cable runs are broken.
Device type is incorrect.
EOL jumpers on MM-CVT101 or NCM are
not installed.
MM-CVT101 is not plugged into the
Personal Computer (PC) or 120 VAC
source.
Wiring near the Bus is broken.
No point mapping entered.
Function
Indicates heating is energized by the low limit frost protection (42°F [5.5°C]).
Indicates there is a service alarm in accordance with one of the programmable Digital
Inputs (DI1 or DI2).
Indicates the filter (or filters) are dirty in accordance with one of the programmable
Digital Inputs (DI1 or DI2).
TEC2103-2 Networked Multi-Stage Thermostat Installation Instructions
Solution
Change each duplicate address to a unique
number.
Refer to the N2 Communications Bus Technical
Bulletin (LIT-636018).
Change each duplicate address to a unique
number.
The maximum of N2 devices allowed on the
N2 Bus is as follows: 100 devices per NCM,
32 devices per N30, 32 devices per N31,
150 devices per the Companion/Facilitator
system.
Apply power to the TEC2103-2 thermostat.
Locate and correct the wiring.
TEC2103-2 thermostat address must be VND
device type.
Install EOL jumpers properly.
Plug MM-CVT101 into PC or plug it into a
120 VAC source.
Repair the wiring.
Define the BAS dataset.
17
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