tekmar 420 Boiler Reset Module - Manual (Page 22)

© 2007 D 420 - 08/07 22 of 24
Error Message Description
ADJUST ERROR
The control failed to read the Adjust menu settings, and reloaded the factory default settings.
Operation stops until you check the Adjust menu settings.
Note:
To clear the error, the access level must be set to Advanced and the settings in the
Adjust menu must be checked.
MISCELLANEOUS ERROR
The control failed to read the Miscellaneous menu settings, and reloaded the factory default
settings. Operation stops until you check the Miscellaneous menu settings.
Note:
To clear the error, the access level must be set to Advanced and the settings in the
Misc menu must be checked.
BOILER BUS ERROR
Communication has been lost on the boiler bus. Check the tN4, C and R wires for each tN4
device. Check the polarity of the C and R wires. Check for loose or broken wires.
BOILER BUS DEVICE LOST
Communication is lost to a tN4 device at address AA on the Boiler bus. The LCD on the lost
device displays Bus Boil OPn. Ensure that there is power to the lost device. Trace the wires
from the control to the lost device looking for loose or damaged wires.
Note:
If you deliberately remove a tN4 device, hold the Up and Down buttons to clear the
error.
MIX MODULE ERROR
A Mixing Module has been connected to the Boiler bus. Ensure that there is not a Mixing
Module on the Boiler bus.
BOILER SENSOR SHORT CIRCUIT
Due to a short circuit, the control failed to read the boiler sensor. When there is a call for heat,
the control no longer controls the boiler(s). Instead, the control provides a boiler enable to
the boiler’s aquastat or boiler control until the sensor is repaired. The control will not operate
the boiler contact if the Boil Minimum setting is less than 100°F (38.0°C). Locate and repair
the problem as described in the Data Brochure D 070.
BOILER SENSOR OPEN CIRCUIT
Due to an open circuit, the control failed to read the boiler sensor. The control no longer controls
the boiler. Instead, the control provides a boiler enable to the boiler’s aquastat or boiler control
until the sensor is repaired. The control will not operate the boiler contact if the Boil Minimum
setting is less than 100°F (38.0°C). Locate and repair the problem as described in the Data
Brochure D 070. If you deliberately remove the boiler sensor, set the Boiler Sensor Return /
Supply DIP switch to Return. Power down for 10 seconds then restart the control.
OUTDOOR SENSOR SHORT CIRCUIT
Due to a short circuit, the control failed to read the outdoor sensor. As a result, the control
assumes an outdoor temperature of 32°F (0.0°C) and continues operation. Locate and repair
the problem as described in the Data Brochure D 070.
Error Messages (1 of 2)