© 2009 D 527 - 06/09 24 of 28
Troubleshooting Guide
We expect your tekmarNet system to operate trouble-free. If an error should occur, simply follow these steps:
1. Find: If a thermostat flashes
on the bottom of the screen, it is indicating a problem on the system.
2. Identify: Match what is showing on the thermostat screen with one of the Error Messages below.
3. Solve: Each Error Message has a Description. Use it to locate possible sources of the problem and reach a solution.
Error Message Description
CONTROL ERROR
The thermostat was unable to correctly read settings from memory and has reloaded the
factory defaults settings. The thermostat does not operate the heating, cooling, or the fan
while this error message is present.
To enter the installer Adjust Menu, press Mode, , and buttons at the same time. Press
the Mode button to advance to the next setting. Error clears once all adjust menu settings
have been checked.
PORT ERROR
Thermostat has been connected to a tN2 Zone already in use by a 2-stage device. A 2-stage
device requires two tN2 ports to operate. This device may be connected to one such port.
Move the thermostat’s tN2 wires to an unused tN2 port on the control.
BUS ERROR
The tN4 communication bus has either an open or a short circuit. Check for loose wires.
Check for short circuits between the tN4 and C wires at the system control.
Error clears automatically once wiring fault has been corrected.
If the thermostat is intentionally removed from the system, 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, User Switches, Timers and Setpoint Controls. The device count must be
lowered to 24 or less. If possible, move devices to other tekmarNet
®
busses.
Error clears automatically once the number of devices on the tekmarNet
®
bus is at 24 or
lower.
ADDRESS ERROR
This thermostat and another device have been manually given the same tekmarNet
®
address.
Error clears automatically once this thermostat is given a new manually set address or if
the thermostat is set to automatic addressing.
ROOM SENSOR SHORT CIRCUIT
The built-in air temperature sensor has a short circuit fault.
If a floor sensor is present (Thermostat 528 only), heating will operate to satisfy floor min.
This error cannot be field repaired. Contact your wholesaler or tekmar sales representative
for details on the repair procedures.
ROOM SENSOR OPEN CIRCUIT
The built-in air temperature sensor has an open circuit fault.
If a floor sensor is present (Thermostat 528 only), heating will operate to satisfy floor min.
This error cannot be field repaired. Contact your wholesaler or tekmar sales representative
for details on the repair procedures.
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