Service Manual

45 of 48 © 2015 680_D - 10/15
Description
SNOW SENSOR 1 YELLOW WIRE OPEN CIRCUIT ERROR
Due to an open circuit, the control is unable to read the yellow wire connected to the Snow/Ice Sensor 090 or 094, or the Snow
Sensor 095 on terminals 20 and 22. The control continues normal operation if snow/ice sensor 2 is installed; otherwise, the
control can no longer automatically detect snow or ice, but manual start of the snow melting system is still available.
Check the snow/ice sensor or snow sensor yellow and black wires and any wire splices for open circuits according to the
sensor installation manual. It may be necessary to replace the sensor. Once the error has been corrected, the error message
automatically clears.
SNOW SENSOR 1 BLUE WIRE OPEN CIRCUIT ERROR
Due to an open circuit, the control is unable to read the blue wire connected to the Snow/Ice Sensor 090 or 094, or the Snow
Sensor 095 on terminals 20 and 21. The control continues normal operation if snow/ice sensor 2 is installed; otherwise, the
control can no longer automatically detect snow or ice, but manual start of the snow melting system is still available.
Check the snow/ice sensor 1 or snow sensor 1 blue and black wires and any wire splices for open circuits according to the
sensor installation manual. It may be necessary to replace the sensor. Once the error has been corrected, the error message
automatically clears.
SNOW SENSOR 1 BLUE WIRE SHORT CIRCUIT ERROR
Due to a short circuit, the control is unable to read the blue wire connected to the Snow/Ice Sensor 090 or 094, or the Snow
Sensor 095 on terminals 20 and 21. The control continues normal operation if snow/ice sensor 2 is installed; otherwise, the
control can no longer automatically detect snow or ice, but manual start of the snow melting system is still available.
First check the snow/ice sensor 1 or snow sensor 1 for dirt or debris. The ring structure of the sensor may need cleaning with hot
soapy water and a nylon brush. Rinse with water. Second, check the snow/ice sensor 1 or snow sensor 1 blue and black wires
and any wire splices for short circuits according to the sensor installation manual. It may be necessary to replace the sensor.
Once the error has been corrected, the error message automatically clears.
SNOW SENSOR 1 BROWN WIRE OPEN CIRCUIT ERROR
Due to an open circuit, the control is unable to read the brown wire connected to the Snow/Ice Sensor 090 or 094 on terminals
19 and 20. The control continues normal operation if snow/ice sensor 2 is installed; otherwise, Idling and Storm is disabled and
energy saving features such as Warm Weather Shut Down (WWSD) and Cold Weather Cut Off (CWCO) are operated using
the outdoor temperature only.
Check the snow/ice sensor 1 brown and black wires for open circuits according to the sensor installation manual. It may be
necessary to replace the sensor. Once the error has been corrected, the error message automatically clears.
SNOW SENSOR 1 BROWN WIRE SHORT CIRCUIT ERROR
Due to a short circuit, the control is unable to read the brown wire connected to the Snow/Ice Sensor 090 or 094 on terminals
19 and 20. The control continues normal operation if snow/ice sensor 2 is installed; otherwise, Idling and Storm is disabled and
energy saving features such as Warm Weather Shut Down (WWSD) and Cold Weather Cut Off (CWCO) are operated using
the outdoor temperature only.
Check the snow/ice sensor 1 brown and black wires for short circuits according to the sensor installation manual. It may be
necessary to replace the sensor. Once the error has been corrected, the error message automatically clears.
SNOW/ICE SENSOR 1 ERROR
The control is unable to properly detect the Snow/Ice Sensor 090 or 094 on terminals 19, 20, 21, 22 and 23. The control continues
normal operation if snow/ice sensor 2 is installed; otherwise, the control can no longer automatically detect snow or ice, but
manual start of the snow melting system is still available.
Check the snow/ice sensor 1 brown, yellow, red and black wires according to the sensor installation manual. It is important
to check any cable splices for loose wiring connections. It may be necessary to replace the sensor. Once the error has been
corrected, the error message automatically clears.
SNOW SENSOR 1 ERROR
The control is unable to properly detect the Snow Sensor 095 on terminals 20, 21, 22 and 23. The control continues normal
operation if snow sensor 2 is installed; otherwise, the control can no longer automatically detect snow but manual start of the
snow melting system is still available.
Check the snow sensor 1 yellow, red and black wires according to the sensor installation manual. It may be necessary to replace
the sensor. Once the error has been corrected, the error message automatically clears.
SLAB SENSOR 2 OPEN CIRCUIT ERROR
Due to an open circuit, the control is unable to read the Slab Sensor 072 or 073 on terminals 24 and 25. The control continues
normal operation if slab sensor 1 is installed; otherwise, Idling and Storm are disabled and energy saving features such as Warm
Weather Shut Down (WWSD) and Cold Weather Cut Off (CWCO) are operated using the outdoor temperature only.
Check the slab sensor 2 wire for open circuits according to the sensor installation manual. It may be necessary to replace the
slab sensor. Once the error has been corrected, the error message automatically clears.
If the slab sensor 2 has been intentionally removed, set the slab sensor 2 setting in the System Setup menu to Off.
Error Messages (3 of 4)