tekmar 542 Thermostat Installation - Manual (Page 26)

© 2007 D 542 - 08/07 26 of 28
Error Messages (2 of 3)
Error Message Description
NO tN4 SYSTEM CONTROL
The tN4 System Control DIP switch is set to tN4 System Control and the thermostat does
not detect the tN4 System Control. Once the tN4 System Control is detected, this error will
clear automatically.
Note: If a tN4 System Control is not installed, set the tN4 System Control DIP switch to None.
ADDRESS ERROR
Two thermostats have been manually set to the same address. The thermostat continues to
operate with this error but does not communicate with the tN4 bus. To clear this error select
an unused address. This can be done automatically by setting the Address item to Auto.
DEVICE LIMIT
You have installed more than 24 devices on the tN4 bus. You must remove the additional
devices and move them to a different bus if possible.
DIP SWITCH 2 MODE
The tN4 System Control DIP switch is set to None and the thermostat has detected a tN4
System Control. The thermostat does not operate until this error is corrected. The tN4 System
Control DIP switch must be set to tN4 System Control.
ROOM SENSOR SHORT CIRCUIT
Due to a short circuit, the thermostat failed to read the built-in sensor. If either Sensor 1 or 2 is
set to ROOM, or the thermostat is connected to a tN4 System Control, the thermostat continues
to operate. Otherwise, the thermostat stops operation. To clear the error, press either the
Menu or Item button. If the error does not clear, contact your tekmar sales representative.
ROOM SENSOR OPEN CIRCUIT
Due to an open circuit, the thermostat failed to read the built-in sensor. If either Sensor 1 or 2 is
set to ROOM, or the thermostat is connected to a tN4 System Control, the thermostat continues
to operate. Otherwise, the thermostat stops operation. To clear the error, press either the
Menu or Item button. If the error does not clear, contact your tekmar sales representative.
SENSOR 1 SHORT CIRCUIT
Due to a short circuit, the thermostat failed to read the Sensor 1. The thermostat displays the
error and continues to operate unless:
No other Room sensors are available and the thermostat is not connected to a tN4 System
control. Then the thermostat stops operation.
No other Floor sensors are available and the Floor Maximum is not set to Off, then the H1
contact no longer operates.
Locate and repair the problem as described in the Data Brochure D 070. Once the error is
corrected, press any button to clear the error.
SENSOR 1 OPEN CIRCUIT
Due to an open circuit, the thermostat failed to read the Sensor 1. The thermostat displays
the error and continues to operate unless:
No other Room sensors are available and the thermostat is not connected to a tN4 System
control. Then the thermostat stops operation.
No other Floor sensors are available and the Floor Maximum is not set to Off, then the H1
contact no longer operates.
Locate and repair the problem as described in the Data Brochure D 070. Once the error is
corrected, press any button to clear the error.