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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.
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