Watts tekmar 294 - Troubleshooting - Errors and Alerts (1)

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IOM-T-294 2205 © 2022 tekmar
It is recommended to complete all wiring to ensure trouble free operation. Should an error occur, simply follow these steps:
1. Find: If a banner is on the screen, it is indicating a problem on the system.
2. Identify: Press the  icon on the top right corner to enter the menus and press notifications. The latest error notification will
appear at the top of the list.
3. Solve: The notification description provides the instructions on the corrective action require to clear the error.
Error Title Description
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.
Boiler Sensor Short
Error
A short circuit is detected on the boiler supply temperature sensor input. The control will not operate the
boilers until this fault is corrected.
To correct, remove the wires from the boiler supply 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 082.
Once the fault is corrected, the error clears automatically.
Boiler Sensor Open
Error
An open circuit is detected on the boiler supply temperature sensor input. The control will not operate the
boilers until this fault is corrected.
To correct, remove the wires from the boiler supply 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 082. Once the fault is corrected, the error clears automatically.
Domestic Hot Water
Short Sensor Error
A short circuit is detected on the domestic hot water temperature sensor input. The control will not heat the
domestic hot water tank until this fault is corrected.
To correct, remove the wires from the DHW 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 Universal Sensor 078. Once the fault is corrected, the error clears automatically.
Domestic Hot Water
Open Sensor Error
An open circuit is detected on the domestic hot water temperature sensor input. The control will not heat the
domestic hot water tank until this fault is corrected.
The DHW sensor is optional and the setting incorrectly turned on. Check if a sensor is installed. If not installed,
set DHW Sensor to off. If installed, remove the wires from the DHW 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 078. Once the fault is corrected, the error
clears automatically.
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.
Troubleshooting
Errors and Alerts (1 of 4)