Service Manual

© 2015 680_D - 10/15 44 of 48
Description
SYSTEM SUPPLY SENSOR OPEN CIRCUIT ERROR
Due to an open circuit, the control is unable to read the System Supply Sensor 082 on terminals 11 and 12. The control stops
operation and does not provide any heat.
Check the system supply sensor wire for open circuits according to the sensor installation manual. It may be necessary to replace
the system supply sensor. Once the error has been corrected, the error message automatically clears.
SYSTEM SUPPLY SENSOR SHORT CIRCUIT ERROR
Due to a short circuit, the control is unable to read the System Supply Sensor 082 on terminals 11 and 12. The control stops
operation and does not provide any heat.
Check the system supply sensor wire for short circuits according to the sensor installation manual. It may be necessary to replace
the system supply sensor. Once the error has been corrected, the error message automatically clears.
SYSTEM RETURN SENSOR OPEN CIRCUIT ERROR
Due to an open circuit, the control is unable to read the System Return Sensor 082 on terminals 11 and 13. The control continues
normal operation but does not accumulate any energy usage.
Check the system return sensor wire for open circuits according to the sensor installation manual. It may be necessary to replace
the system return sensor. Once the error has been corrected, the error message automatically clears.
SYSTEM RETURN SENSOR SHORT CIRCUIT ERROR
Due to a short circuit, the control is unable to read the System Return Sensor 082 on terminals 11 and 13. The control continues
normal operation but does not accumulate any energy usage.
Check the system return sensor wire for short circuits according to the sensor installation manual. It may be necessary to replace
the system return sensor. Once the error has been corrected, the error message automatically clears.
BOILER SUPPLY SENSOR OPEN CIRCUIT ERROR
Due to an open circuit, the control is unable to read the Boiler Supply Sensor 082 on terminals 8 and 9. When application mode
is set to boiler or boiler+mix the control stops operation. In all other application modes, the control continues to heat the snow
melting system but does not control the boiler operating temperature.
Check the boiler supply sensor wire for open circuits according to the sensor installation manual. It may be necessary to replace
the boiler supply sensor. Once the error has been corrected, the error message automatically clears.
BOILER SUPPLY SENSOR SHORT CIRCUIT ERROR
Due to a short circuit, the control is unable to read the Boiler Supply Sensor 082 on terminals 8 and 9. When application mode
is set to boiler or boiler+mix the control stops operation. In all other application modes, the control continues to heat the snow
melting system but does not control the boiler operating temperature.
Check the boiler supply sensor wire for short circuits according to the sensor installation manual. It may be necessary to replace
the boiler supply sensor. Once the error has been corrected, the error message automatically clears.
BOILER RETURN SENSOR OPEN CIRCUIT ERROR
Due to an open circuit, the control is unable to read the Boiler Return Sensor 082 on terminals 8 and 10. The control continues
to heat the snow melting system but does not provide boiler protection.
Check the boiler return sensor wire for open circuits according to the sensor installation manual. It may be necessary to replace
the boiler return sensor. Once the error has been corrected, the error message automatically clears.
BOILER RETURN SENSOR SHORT CIRCUIT ERROR
Due to a short circuit, the control is unable to read the Boiler Return Sensor 082 on terminals 8 and 10. The control continues
to heat the snow melting system but does not provide boiler protection.
Check the boiler return sensor wire for short circuits according to the sensor installation manual. It may be necessary to replace
the boiler return sensor. Once the error has been corrected, the error message automatically clears.
SLAB 1 SENSOR OPEN CIRCUIT ERROR
Due to an open circuit, the control is unable to read the Slab Sensor 072 or 073 on terminals 19 and 20. The control continues
normal operation if slab sensor 2 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 1 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 1 has been intentionally removed, set the slab sensor 1 setting in the System Setup menu to Off.
SLAB 1 SENSOR SHORT CIRCUIT ERROR
Due to a short circuit, the control is unable to read the Slab Sensor 072 or 073 on terminals 19 and 20. The control continues
normal operation if slab sensor 2 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 1 wire for short 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.
Error Messages (2 of 4)