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DD: HEATING / COOLING MODE CONFLICT
1. Error display:
IDU display: dd
2. Applicable models:
All indoor units
3. Error definition:
• Different operating modes for IDU and ODU (Heat Pump or Single Phase VRF)
• Different operating modes for IDUs sharing one port of MDC (Heat Recovery)
4. Possible causes:
• For Heat Pump or Single Phase VRF system
• The ODU is operating in Heating mode; while the IDU is operating in Cooling, Fan, or Dry mode
• The ODU is operating in Cooling/Dry mode, while the IDU is operating in Heating mode
• Indoor units sharing the same port in the MDC (for Heat Recovery system)
• One is operating Heating mode, but the other is operating in Cooling, Fan, or Dry mode
• One is operating Cooling, Fan, or Dry mode, while the other one is to operate Heating mode. In this case, the one
operating in Cooling, Fan, or Dry mode will display “dd”
NOTE:
The conflict is between Heating and Cooling modes, Heating and Fan modes, and Heating and Dry modes.
The Cooling, Fan, and Dry modes are not in conflict with each other.
Check the operation modes of
ODU and conflicting IDU
Change the operation modes for
conflicting IDU
Check whether IDU modes on the
same port as the MDC are different
Change operation modes for the
conflicting IDU
Heat Recovery system
Heat pump or Mini-VRF system:
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