33
Errors and Alerts (2 of 3)
Error or Alert Title
Description
Indoor Sensor Open
Error
An open circuit is detected with the indoor sensor on the Aux sensor input .
The indoor sensor is optional, and the setting may be incorrectly turned on . Check if a sensor is installed . If
not installed, set Auxiliary Sensor to off . If installed, remove the wires from the Aux sensor terminals, then use
an electrical multimeter to measure the resistance . The resistance should be proportional to the temperature
lookup table in the Installation and Operation Manual . If the resistance is open circuit, check the wires for
loose wiring connections . If the wires are ok, then replace the Indoor Sensor 076, 077 or 084 . Once the fault
is corrected, the error clears automatically .
Flue Sensor Short Error
A short circuit is detected with the flue sensor connected to the Aux sensor input .
To correct, remove the wires from the Aux sensor terminals, then use an electrical multimeter to measure
the resistance . The resistance should be proportional to the temperature lookup table in the Installation and
Operation Manual . Check the wires for damage . If the wires are ok, then replace the Boiler Flue Sensor 069 .
Once the fault is corrected, the error clears automatically .
Flue Sensor Open Error
An open circuit is detected with the flue sensor on the Aux sensor input .
The flue sensor is optional, and the setting may be incorrectly turned on . Check if a sensor is installed . If not
installed, set Auxiliary Sensor to off . If installed, remove the wires from the Aux sensor terminals, then use an
electrical multimeter to measure the resistance . The resistance should be proportional to the temperature
lookup table in the Installation and Operation Manual . If the resistance is open circuit, check the wires for loose
wiring connections . If the wires are ok, then replace the Boiler Flue Sensor 069 . Once the fault is corrected,
the error clears automatically .
Pressure Sensor Short
Circuit Error
A short circuit is detected on the pressure sensor input . The control continues to operate normally but is
unable to detect pressure changes .
Inspect the pressure sensor wires for damage . If the wires are OK, use an electrical meter to measure the DC
voltage between the pressure sensor Ref and Gnd terminals . This should measure 5 .0 V(dc) . Then check the
voltage between pressure sensor In and Gnd . This voltage should measure 0 .5 to 4 .5 V(dc) depending on the
system pressure . If either voltage reading is abnormal then replace the Pressure Sensor 089 . Once the fault
is corrected, the error clears automatically .
Pressure Sensor
Open Circuit Error
An open circuit is detected on the pressure sensor input . The control continues to operate normally but is
unable to detect pressure changes . If a pressure sensor is not installed, set the Pressure Sensor setting in
the System menu to Off .
If a pressure sensor is installed, inspect the wires for loose connections . If the wires are OK, use an electrical
meter to measure the DC voltage between the pressure sensor Ref and Gnd terminals . This should measure
5 .0 V(dc) . Then check the voltage between pressure sensor In and Gnd . This voltage should measure 0 .5 to
4 .5 V(dc) depending on the system pressure . If either voltage reading is abnormal then replace the Pressure
Sensor 089 . Once the fault is corrected, the error clears automatically .
Boiler Plant No Heat
Alert
The boiler supply temperature did not increase within the boiler alert time . There is likely a mechanical failure
with either a boiler or circulator that requires immediate attention . The control operates normally while this
alert is present .
To reset the alert, press the ‘X’ button to dismiss the error message on the home screen .
High Pressure Alert
The system pressure exceeded the High Pressure Alert threshold . There may be a problem with the boiler
pressure or air vents . The control operates normally while this alert is present .
The alert clears when the pressure falls 1 psi (7 kPa) below the High Pressure Alert threshold .
Flue Temperature Alert
The flue temperature has exceeded the Flue Temperature Alert temperature . The alert clears automatically
once the vent temperature drops 10°F (5 .5°C) below the Flue Temperature Alert threshold .
Indoor Temperature
Cold Alert
The indoor temperature is below the Indoor Temperature Cold Alert threshold . This may indicate a problem
with the heating system .
The alert will automatically clear when the indoor temperature is 1°F (0 .5°C) above the threshold .
Indoor Temperature
Hot Alert
The indoor temperature has exceeded the Indoor Temperature Hot Alert threshold . This may indicate a problem
with the heating system and the boilers are shut off .
The alert will automatically clear when the indoor temperature is 1°F (0 .5°C) below the threshold .
Boiler 1 Service Hours
Alert
The boiler run time has exceeded the recommended boiler service hours alert interval . Once maintenance
has been completed, the service interval can be reset in the boiler status screen .
