H B X S N O - 0 5 5 0 S n o w M e l t C o n t r o l
V e r s i o n 2 . 1 4 . 1
Page 20
ISSUE
POSSIBLE CAUSES & RESOLUTIONS
Error showing on screen
• Sensor is not installed. See wiring on page 19.
• Damaged Sensor: check for cracks or deformations (Slab
temperature)
• Slab setup is incorrect.
(See page 10.)
Injection pump not turning on
• Check wiring.
(See page 20)
• Make sure mixing is set to injection.
(See page 11.)
Build-up of snow to start melting
• Slab Snow rate setup is too high
• Delta T is set too low.
(See page 8.)
Valve not turning on
•
Mixing setup needs to be set to floating.
(See page 11.)
• Check the wiring
(see page 20.)
Snow melt is on when no snow is
present
• Damaged sensor: check for cracks or deformations
• Check SNO-0110 troubleshooting manual
Not automatically turning on
• No demand present.
(See page 11.)
• Demand is set to Standby/Idle or Anticipate.
(See page 11.)
Force Demand Melt Mode not
working
• Demand is not in Force Demand Melt.
(See page 11.)
System Pump Not Working
• Check Wiring
(see page 20.)
Boiler is not working
• Check wiring:
(See page 20.)
• Check system design temperatures.
(See page 9.)
Slab Temp changes drastically
when it comes in or out of WWSD/
CWSD
• The optical sensor has a built in heater and when it is installed
in the slab. without the Aux. slab sensor the control will minus off
approximately 40F/22C off the actual slab temp to accommodate
for the internal heater that has now started up. This heater can
take up to 1 hour to reach it’s setpoint, thus your slab will appear
that it is much colder when it first turns on, the opposite is true when
it goes into WWSD or CWSD the slab temp will jump by 40F/22C as
the control removes the adjustment, and the heater will now slowly
cool down which could take up to 1 hour.
SNO-0550 TROUBLESHOOTING GUIDE