Command 0x01 - Set Settings
This command is used to issue a new operation state to the heat pump. It controls core behaviors like power, mode, target temperature, and similar.
| Byte | Purpose | Possible Values | Supported by mUART | Notes |
|---|---|---|---|---|
| 0 | Command Type | 0x01 | Yes | |
| 1-2 | Update Flags | Traditional hex flags | Partially | Indicates which parameters to update. |
| 3 | Power | 0x00: Off 0x01: On 0x02: Test Mode | No | Update flag 0x0001 |
| 4 | Operating Mode | Operating Modes | No | Update flag 0x0002 |
| 5 | Legacy Target Temperature | Legacy Setpoint Temperature | Update flag 0x0004 | |
| 6 | Fan | Fan Modes | Update flag 0x0008 Not all values supported for all units. | |
| 7 | Vertical Vane | Vertical Vane | Update flag 0x0010 Defaults to 0x5 on air handlers (?) | |
| 8 | ||||
| 9 | ||||
| 10 | ||||
| 11 | Prohibit Flags | Prohibit Flags | Update Flag 0x0040 | |
| 12 | ||||
| 13 | Horizontal Vane | Horizontal Vane | Update Flag 0x0100 | |
| 14 | Target Temperature | Enhanced Temperature | Update Flag 0x0004. Takes priority over legacy temperature | |
| 15 |
Sample Packets
[FC.41.01.30.10] 01.07.00.01.01.00.FF.01.00.00.00.00.00.00.AE.00 C6
Operating Modes
| Value | Name | Settable | Notes |
|---|---|---|---|
| 1 | Heat | Yes | |
| 2 | Dehumidify | Yes | |
| 3 | Cool | Yes | |
| 7 | Fan | Yes | |
| 8 | Auto | Yes | |
| 9 | i-see Heat | No | |
| 10 | i-see Dry | No | |
| 11 | i-see Cool | No | |
| 33 | Auto Heat | No | Only reported in Kumo Cloud API |
| 35 | Auto Cool | No | Only reported in Kumo Cloud API |
Operating mode 8 will use the current temperature of the room as well as the current setpoint to determine whether to heat or cool. Mode 8 will be returned regardless of the status of the i-see feature.
As of the time of writing this documentation, mode 8 will not work with MHK2 units. The MHK2 will intercept the request for auto mode and configure its own dual-setpoint behavior.
Operating modes 9-11 are read-only, and will only be returned by the heat pump when i-see mode is enabled. If i-see mode is disabled, the unit will return the normal value.
Fan Modes
Supported fan modes can be extracted from the Extended Connect Response packet.
| Value | Name |
|---|---|
| 0 | Auto |
| 1 | Quiet |
| 2 | Low |
| 3 | Medium |
| 5 | High |
| 6 | Very High (Powerful) |
Vertical Vane
| Value | Name |
|---|---|
| 0 | Auto Position |
| 1 | Position 1 (0°) |
| 2 | Position 2 |
| 3 | Position 3 (45°) |
| 4 | Position 4 |
| 5 | Position 5 (90°) |
| 7 | Swing Mode |
If set on a dual vane unit, both the left and right vanes will update in sync. There is not currently a known way to set each vane side independently.
Prohibit Flags
The exact intent of this byte is unknown, but it appears to prevent certain changes from being made so long as the prohibit flags are in place.
| Bit | Purpose | Supported by mUART | Notes |
|---|---|---|---|
| 0x01 | Lock Power | ||
| 0x02 | Lock Operating Mode | ||
| 0x04 | Lock Temperature |
Horizontal Vane
| Value | Name | Symbol | Notes |
|---|---|---|---|
| 0 | Auto | ||
| 1 | Full Left | << | |
| 2 | Left | < | |
| 3 | Center | | | |
| 4 | Right | > | |
| 5 | Full Right | >> | |
| 6 | Split (Left/Center) | Unconfirmed, may be JP only. | |
| 7 | Split (Center/Right) | Unconfirmed, may be JP only. | |
| 8 | Split (Left/Right) | <> | |
| 9 | Split (Left/Center/Right) | Unconfirmed, may be JP only. | |
| 12 | Swing Mode |
Note that auto mode may not be supported on all units, and appears to get overwritten with relative frequency (but does appear to otherwise work).