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
Page 48
ISSUE
POSSIBLE CAUSES & RESOLUTIONS
Staging Mode
Control won’t turn on boiler(s)
• Check if there is heating demand on pins 1-2
• Check boiler setup settings
• Check WWSD
• Check wiring for demands and boiler outputs
Boiler Cycling too frequently
• Check boiler differential settings
• Check boiler lag time
Abnormal boiler target
• Check outdoor reset settings
Control won’t go into heating
• Check if there is a demand on pin 7-8 (HD) and pins 9-10 (DHW).
• Check WWSD
No heat demand is present
• Check is there a demand on pins 7-8
• Check if permanent heat demand is on
Control is WWSD when outside
temperature is below WWSD
• Check that outdoor sensor is connected to thermistor inputs
• Check outdoor sensor placement. Outdoor sensor should not be in
direct sunlight.
Boiler/DHW/Outdoor
temperatures showing dashes
• Check if boiler/dhw/outdoor sensors are connected to thermistor
inputs (check wiring)
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
Outdoor Sensor displays dashes
on control display
• Check outdoor sensor is connected on pins (14-16)
Heat pump(s) in not turning on
• No heat demand
• Control is WWSD
CPU-0600 TROUBLESHOOTING GUIDE
For additional assistance with the CPU-0600, please contact
our Technical Support Department toll free at:
+1 (855) 410-2341
