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Document the temperature profile mode and the filter properties - #81

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document-rmi-properties
Aug 2, 2026
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Document the temperature profile mode and the filter properties#81
michaelarnauts merged 1 commit into
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document-rmi-properties

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Documents the properties reported in #76 for a ComfoAir Q600 (ComfoConnect LAN C, firmware R1.5.5), found by changing one setting in the Zehnder app and diffing a full property scan.

Unit Property Meaning
TEMPHUMCONTROL (0x1D) 0x08 Temperature profile mode (0=adaptive, 1=fixed, 2=external setpoint)
FILTER (0x1C) 0x02 Filter pre-warning period in days (21)
FILTER (0x1C) 0x03 Filter lifetime in days (150)

The FILTER unit had no properties documented at all until now.

Some caveats, all marked in the table with a ?:

  • Value 2 of TEMPHUMCONTROL 0x08 (external setpoint) was assumed by the reporter, not tested.
  • FILTER 0x02 was inferred: Zehnder documents a configurable 21-day pre-warning, the property reads exactly 21, and the "order new filters" message appeared at 19 days remaining. The value itself was never changed.
  • FILTER 0x03 is solid: written 150 -> 60 -> 2 -> 150 with SENSOR_DAYS_TO_REPLACE_FILTER (PDID 192) tracking every change.
  • The formats (UINT8 / UINT16) are inferred from the values, the report did not mention byte widths.

Property 0x0E of TEMPHUMCONTROL is in the issue title but no details about it made it into the issue body, so it stays undocumented for now.

🤖 Generated with Claude Code

Reported in #76 for a ComfoAir Q600 on firmware R1.5.5, found by changing
one setting in the app and diffing a full property scan.

The formats are inferred from the values, they were not part of the
report. Property 0x0E of TEMPHUMCONTROL is mentioned in the issue title
but no details about it made it into the issue.
@michaelarnauts
michaelarnauts merged commit 2911fb3 into master Aug 2, 2026
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@michaelarnauts
michaelarnauts deleted the document-rmi-properties branch August 2, 2026 16:31
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