TSBC Instruction Manual Page 37 of 48
Trouble Shooting
Alarm Messages (continued)
LCD Display
Alarm Message
Recommended Action Explanation
Remote Input
Fail
Red Alarm Light
Check wiring and
Remote System
Remote Control Input Fail
The Remote Control Input is configured and is not connected or is above
or below a valid range. When the remote control input fails the following
control mode changes are taken automatically:
Selected Modes Resulting Control Mode
Remote Mod Outlet sensor and Local Setpoint
Remote Mod & Remote Sensor Remote Sensor and Local Setpoint
Remote SP Outlet Sensor and Local Setpoint
Remote SP & Remote Sensor Remote Sensor and Local Setpoint
Comm Failure
Red Alarm Light
Check wiring and
Remote System
Confirm each boiler has
a unique address
Communication Failure
The Modbus or Peer-To-Peer network has failed. When the Modbus
network fails the following control mode changes are taken
automatically:
Selected Modes Resulting Control Mode
Modbus Mod Outlet sensor and Local Setpoint
Modbus Mod & Remote Sensor Remote Sensor and Local Setpoint
Modbus SP Outlet Sensor and Local Setpoint
Modbus SP & Remote Sensor Remote Sensor and Local Setpoint
After a Modus communication failure, the ‘Comm Failure’ alarm is not
cleared until communication is restored and a successful writes to both
the Remote On / Off Modbus Command (00004) and Remote Firing
Rate or Remote Setpoint (40006) points have been completed, power is
cycled or the protocol parameter is changed to Peer-To-Peer and then
back to Modbus.
When a Peer-To-Peer network has failed the boilers begin operation as
stand alone boilers using the selected parameters.
After a Peer-To-Peer communication failure the ‘Comm Failure’ alarm is
not cleared until communication is restored and the boiler rejoins a
network with at least one other boiler, power is cycled or the protocol
parameter is changed to Modbus and then back to Peer-To-Peer.
Low Inlet Temp
Red Alarm Light
Check wiring and
sensor
Check return water
temperature. Consider
system or operational
changes to avoid low
temperature events
Low Boiler Inlet Temperature
If the boiler inlet temperature is below the Low boiler inlet temperature
setpoint, the “Low Inlet Temp” Message is displayed and the boiler inlet
temperature history is stored. See following page for additional
information on Low boiler inlet temperature history storage and retrieval.
Memory Failure
Red Alarm Light
Call Factory;
Reset all memories in
System menu:
Clr BIT History
Clr Alarm Hist
Clr Run Time Cnt
Clr Cycle Cnt
Factory Defaults
(Factory Level
Password is required)
Memory Failure
New software has been installed in the TSBC or a power interruption
has caused a memory failure. The Call For Heat will be prevented until
the condition is cleared.
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