Thermal Solutions EVS SERIES - B. TROUBLESHOOTING GUIDE

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B. TROUBLESHOOTING GUIDE
Alarm Messages
Alarm Messages are shown one at a time in priority order. The message closest to the top of this list is displayed rst.
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
Manually Reset the Low
Water Cutoff
Low Water Cutoff Switch
When this option is congured and an instrument 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 pow-
ered the “OFF Switch” Message is displayed.
Low Water Flow
Ensure Boiler Pump is
Running and Boiler
Water Flow is
Unobstructed
Low Water Flow Switch
Low water ow 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
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
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
Check Combustion Air
Blower and Air
Pressure Switch
Settings and Wiring
Low Air Flow or Blocked Vent Switch Not Made
The air ow (and blocked vent switch when installed) 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
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
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
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
Check Wiring and
Sensor
Outside Air Temperature Sensor Fail
The outside air sensor is congured and is not connected or is reading above or
below a valid range. When the outside air sensor fails, the warm weather shut-
down (WWSD) and outside air reset control logics are disabled.
Remote Temp Fail
Check Wiring and
Sensor
Remote System Temperature Sensor Fail
The remote system temperature sensor is congured 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.