TSBC Instruction Manual Page 36 of 48
Trouble Shooting
Alarm Messages
Alarm Messages are shown one at a time in priority order. The message closest to the top of this List is displayed first.
Following messages are not shown until the higher priority message has cleared. All alarm messages are also stored in
the Fault History.
LCD Display
Alarm Message
Recommended
Action
Explanation
Low Water Level
Flashing Red
Alarm Light
Manually Reset the
Low Water Cutoff
Low Water Cutoff Switch
When this option is configured and a control is installed, the manual reset
low water safety relay is preventing the boiler from starting. If terminal
(LC) does not receive power and the Call For Heat output (CH) is powered
the “Low Water Level” Message is displayed.
Off Switch Turn Burner Switch
On
Burner Switch is Off
Control switch is in the OFF position and is preventing the boiler from
starting. If terminal (OO) does not receive power and the Call For Heat
output (CH) is powered the “OFF Switch” Message is displayed.
Low Water Flow
Red Alarm Light
Ensure boiler pump is
running and boiler
water flow is
unobstructed
Low Water Flow Switch
Low water flow is preventing the boiler from starting. If terminal (WF) does
not receive power and the Call For Heat output (CH) is powered the “Low
Water Flow” Message is displayed.
Fuel Limit
Flashing Red
Alarm Light
Manually Reset the
Fuel pressure switch
Low or High Gas Pressure Switch
The low or high gas pressure switch is preventing the boiler from starting.
If terminal (GP) does not receive power and the Call For Heat output (CH)
is powered the “Fuel Limit” Message is displayed.
High Temp Limit
Flashing Red
Alarm Light
Manually Reset the
High Temperature
Aquastat
High Limit Temperature
The high temperature limit (HL) (and operational temperature limit when
provided) aquastat is preventing a boiler start. If terminal (HL) does not
receive power and the Call For Heat output (CH) is powered the “High
Temp Limit” Message is displayed.
Low Air Flow
Flashing Red
Alarm Light
Check combustion air
blower and air
pressure switch
settings and wiring
Low Air Flow or Blocked Vent Switch Not Made
The air flow (and blocked vent switch when provided) is preventing a boiler
start. If terminal (CA) does not receive power and the Call For Heat output
(CH) is powered the “Low Air Flow” Message is displayed.
FSG Fault
Flashing Red
Alarm Light
Manually Reset
Required, Refer to
Flame Safeguard
Manual corrective
actions
Flame Safeguard Fault
The Flame Safeguard is preventing a boiler start. If terminal (AL) receives
power at any time, the “Flame Failure” Message is displayed.
Outlet Temp Fail
Red Alarm Light
Check wiring and
sensor
Boiler Outlet Temperature Sensor Fail
The boiler outlet temperature sensor is not connected or is reading above
or below a valid range. When the boiler outlet sensor fails and the Outlet
Sensor mode was selected the control will transfer to Lost Sensor Blind
Mode.
Inlet Temp Fail
Red Alarm Light
Check wiring and
sensor
Boiler Inlet Temperature Sensor Fail
The boiler inlet temperature sensor is not connected or is reading above or
below a valid range. When the boiler inlet sensor fails the mixing valve
output will drive to 0% and low temperature alarm and maximum water
differential (boiler outlet minus boiler inlet) temperature hold are disabled.
OA Temp Fail
Red Alarm Light
Check wiring and
sensor
Outside Air Temperature Sensor Fail
The outside air sensor is configured and is not connected or is reading
above or below a valid range. When the outside air sensor fails the warm
weather shutdown (WWSD) and outside air reset control logics are
disabled.
Remote Temp
Fail
Red Alarm Light
Check wiring and
sensor
Remote System Temperature Sensor Fail
The remote system temperature sensor is configured and is not connected
or is reading above or below a valid range. If Remote System
Temperature Sensor mode was selected the control will transfer to Boiler
Outlet Sensor Mode.
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