tekmar 421 Mixing Reset Module - Manual (Page 18)

© 2007 D 421 - 08/07 18 of 20
Error Message Description
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.
Note: 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.
OUTDOOR SENSOR OPEN CIRCUIT
Due to an open 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.
DEV SCHD
The selected system schedule is no longer available. Either the system schedule master is no
longer connected to the network or the system schedule number has been changed on the
schedule master.
DEVICE ERROR AT ADDRESS #:##
#:## is the address of the device with the error. The bus number displays before the colon,
and the device number displays after. Go to the device with the address displayed.
Possible Addresses:
1:01 to 1:24 - Device Error on Bus 1
Error Messages (2 of 2)