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Troubleshooting
Table 6: N2 Bus Configuration Troubleshooting
Error/Trouble
Condition
TEC2104-1 cycles
online and offline.
TEC2104-1 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 displays at the headend control should the setpoint not be reached
within 45 minutes (there is no indication locally at the TEC1204-1).
18
TEC2104-1 Networked Multi-Stage Economizer Thermostat Installation Instructions
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.
TEC2104-1 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).
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 TEC2104-1.
Locate and correct the wiring.
TEC2104-1 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.
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