H B X C P U - 0 6 0 0 C o n t r o l
V e r s i o n 1 . 0 . 0
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ISSUE
POSSIBLE CAUSES & RESOLUTIONS
Mixing Mode
Mixing device (injection, floating
action, modulating valve) will not
turn on
• Check wiring
• Control is in boiler protection (you can turn this boiler protection off
if needed)
System temperature fluctuating
• Check outdoor reset values
Control won’t turn on boiler(s)
• Check if there is heating demand on pins 7-8
• Check boiler setup settings
• Check WWSD
• Check wiring for demands and boiler outputs
Pump(s) not turning on
• Check pump setup options to verify the correct pump are selected
• Verify heating or cooling demands are present
• Check WWSD
• Check wiring
Boiler/DHW/System/Outdoor
temperatures showing dashes
• Check if boiler/dhw/system/outdoor sensors are connected to
thermistor inputs (check wiring)
Differential Setpoint Mode
Control won’t turn on pump(s)
• Check if there is demand on pins 7-8
• Check SP1 or SP2 differential settings
• Check pump setup settings
Setpoint temperatures showing
dashes
• Check setpoint sensor wiring
CPU-0600 TROUBLESHOOTING GUIDE
For additional assistance with the CPU-0600, please contact
our Technical Support Department toll free at:
+1 (855) 410-2341