Wiring Schematic

 

Control Memory Error

A memory error has been detected. The control will not operate the boilers until all settings have been reviewed. 

You may also reload factory defaults and use the Setup Wizard to configure the control. If the memory error keeps recurring after a power outage, the control may require replacement. Consult technical support for assistance. 

 

 

Outdoor Sensor Short Error

A short circuit is detected on the outdoor air temperature sensor input. The control operates the central heating system at the boiler design temperature until this fault is corrected. 

To correct, remove the wires from the outdoor air 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 short circuit, check the wires for damage. If the wires are OK, then replace the Outdoor Sensor 070. Once the fault is corrected, the error clears automatically. 

 

Outdoor Sensor Open Error

An open circuit is detected on the outdoor air temperature sensor input. The control operates the central heating system at the boiler design temperature until this fault is corrected. 

To correct, remove the wires from the outdoor air 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 Outdoor Sensor 070. Once the fault is corrected, the error clears automatically. 

 

Condensate Sensor Short Error

A short circuit is detected on the condensate return temperature sensor input. As a result, the control does not operate the establishing steam or cool down periods. 

To correct, remove the wires from the condensate return 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 Universal Sensor 071. Once the fault is corrected, the error clears automatically. 

 

Condensate Sensor Open Error

An open circuit is detected on the condensate return temperature sensor input. As a result, the control does not operate the establishing steam or cool down periods. 

The condensate sensor is optional, and the setting may be incorrectly turned on. Check if a sensor is installed. If not installed, set Condensate Sensor to off. If installed, remove the wires from the condensate return 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 Universal Sensor 071. Once the fault is corrected, the error clears automatically. 

 

Indoor Sensor Short Error

A short circuit is detected with the indoor sensor on 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 Indoor Sensor 076, 077, or 084. Once the fault is corrected, the error clears automatically. 

 

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.

 

Boiler 2 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.

 

Boiler 1 Service Cycles Alert

The boiler has exceeded the recommended boiler service cycles. Once maintenance has been completed, the service interval can be reset in the boiler status screen.

 

Boiler 2 Service Cycles Alert

The boiler has exceeded the recommended boiler service cycles. Once maintenance has been completed, the service interval can be reset in the boiler status screen.

 

Internet Outdoor Sensor Error

The control has not received an outdoor temperature report from the Internet. Please check that your Router is not blocking Port 443. Please contact an IT professional if assistance is required.

 

Wi-Fi Disconnected Error

The Wi-Fi network could not be found. Please check that the Wi-Fi network name was entered correctly and that the Router signal is medium to high strength. If necessary, please reconfigure your Wi-Fi network.

 

Hardware Fault

An internal hardware fault has been detected. Please power the control off then back on. If the hardware fault reoccurs, the control may require replacement. Please contact technical support for assistance.

 

Internet Unavailable Error

The control is unable to communicate to the Watts cloud through the Internet. The error will automatically clear once Internet communications are established. You may also set the Internet Connection Type to Off to clear the error.

To correct:

1. Check the control’s Internet DNS 1 and DNS 2 settings

2. Check that the router firewall is not blocking or filtering MAC addresses

3. Check that the router firewall is not blocking outbound port 53

 

Nexa™ Error

The control is unable to connect to Nexa™ by Watts. Please check that your router is not blocking outbound ports 443 or 8883. Please contact an IT professional for assistance.

 

Ethernet Disconnected Error

The Ethernet is not connected to a network. Check the Ethernet cable connection to the control and the Router or Switch. Check that the Router or Switch is powered on and operating correctly.

 

Wi-Fi Invalid Password Error

The Wi-Fi Password was not accepted. Please check that the password was entered correctly. If necessary, please reconfigure your Wi-Fi network.

 

DHCP Address Error

The router has not assigned the control an IP address. Please check the router’s configuration settings and ensure that the DHCP server is enabled and enough IP addresses are available. Please contact an IT professional for assistance.

Resistance versus Temperature Chart