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Command 0x03 - Get Temperatures

This command is used to retrieve temperature information from the heat pump.

BytePurposePossible ValuesSupported by mUARTNotes
0Command0x03Yes
3Current Legacy TemperatureLegacy Current Temperature
5Outdoor Unit TemperatureEnhanced TemperatureRounded to nearest whole °C
If 0x00, unsupported.
6Current TemperatureEnhanced Temperature
7???Enhanced TemperatureClaimed to be the most recent value, but observations do not match that.
8???0x00, 0xFE
9???0x42, 0x00
11-13RuntimeScalarAppears to be minutes the unit was active.
Not sent for all unit types.

Bytes 6 and 7 are particularly confusing. First off, byte 7 is not sent by all units. SwiCago's thread has identified Byte 7 to be the "most recent" reading, while Byte 6 is the last reading. While this works for external temperature sensors, it does not work for the internal sensor - see below sample packet where it goes from 0xA9 to 0xAC and completely ignores the 0xB0. Kumo's code claims that byte 6 is room_temp_a, and does not use byte 7 at all.

The Outdoor Unit Temperature byte may not be present on all units, and appears to be controlled by the appropriate flag (byte 9, bit 0x20) in the capabilities response. This field appears to not necessarily be an accurate measure, as the heat pump's outdoor unit tends to cause local temperature changes when it's operating. This field is not supported by all units.

Sample Packets

[FC.62.01.30.10]03.00.00.0C.00.92.AC.00.00.00.00.00.00.00.00.00 10  // SVZ-KP30NA

[FC.62.01.30.10]03.00.00.0F.00.92.B2.B6.FE.42.00.01.59.7A.00.00 3D // MSZ-GS12NA
[FC.62.01.30.10]03.00.00.09.00.92.A7.A7.FE.42.00.01.59.7B.00.00 5C
[FC.62.01.30.10]03.00.00.0A.00.8A.A9.A9.FE.42.00.01.5A.ED.00.00 EC
[FC.62.01.30.10]03.00.00.0C.00.88.AC.B0.FE.42.00.01.5A.FA.00.00 D5 // ... internal temp
[FC.62.01.30.10]03.00.00.0C.00.88.AC.A9.FE.42.00.01.5A.FB.00.00 DB // back to external
[FC.62.01.30.10]03.00.00.0A.00.88.A9.A9.FE.42.00.01.5A.FB.00.00 E0
[FC.62.01.30.10]03.00.00.0A.00.88.A9.B0.FE.42.00.01.5A.FC.00.00 D8 // back to internal
[FC.62.01.30.10]03.00.00.0C.00.88.AC.B0.FE.42.00.01.5A.FC.00.00 D3