Install Instructions

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Symptom Look For... Corrective Action
Touchscreen is
off
Power to control
Use electrical meter to measure 115 V (ac) voltage on input power L and N
terminals.
System pump
always on
Display shows Idle
Idle operation requires that the system pump operate continuously while below the
melting temperature setting.
Blue short
Dirt or salt on snow/
ice sensor
The snow/ice sensor requires regular cleaning. Avoid using road salt on the snow
melting slab.
Slab is
above melt
temperature
Slab Target
The slab is heated to the slab target.
System running
with no snow
System is Idling
Idling heats the slab when the temperature falls below the Idle temperature.
System is Melting
During cold weather cut off (CWCO), the system is shut off. If it shuts off during a
melt cycle, the system resumes melting once the outdoor temperature is above
CWCO.
Remaining Run
Time
System manually started.
Slab and Slab
Target
The slab must reach the slab target temperature in order for the system to shut off.
Lower the cold weather cut off (CWCO) or increase the boiler aquastat setting.
Snow on slab
but system did
not start
System is Off
System has been manually stopped and the automatic snow/ice sensor never dried,
thereby preventing the system from automatically starting.
Frequently Asked Questions
WARNING: This product contains chemicals known to the State of
California to cause cancer and birth defects or other reproductive harm.
For more information: Watts.com/prop65