18 of 24© 2011 D 538e - 02/11
Troubleshooting
Error Messages (1 of 4)
Error Message Description
CONTROL ERROR
The thermostat was unable to correctly read settings from memory and has reloaded the factory
default settings. The thermostat does not operate the heating, cooling, or the fan while this error
message is present.
Error clears once all adjust menu settings in the Installer access level (unlocked) have been
checked. Set thermostat’s switch setting #4 to unlock and unlock the tekmarNet
®
system control.
Then press and hold and buttons together for 2 seconds to enter the adjust menu. Continue
until all settings have been reviewed.
BUS ERROR
The tekmarNet
®
4 communication bus has either an open or a short circuit. The result is that there
are no communications. Check for loose wires. Check for short circuits between the tN4 and N
wires. Check for correct polarity between the N and L wires.
Error clears automatically once wiring fault has been corrected.
If the thermostat is intentionally removed from the tekmarNet
®
4 bus, press the and buttons
together to clear the error message.
DEVICE LIMIT
The number of devices on the tekmarNet
®
bus has exceeded 24. Devices include tekmarNet
®
Thermostats and Setpoint Controls. The device count must be lowered to 24 or less. If possible,
move devices to other tekmarNet
®
buses.
Error clears automatically once the number of devices on the tekmarNet
®
bus is at 24 or lower.
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