Bosch A01 (5207)

Medium

Compress — Heat carrier outlet sensor TC1 fault.

Bosch A01 (5207): Heat carrier outlet sensor TC1 fault. This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Sensor TC1 or signal cable open/shorted.

Check steps

Check sensor TC1 & signal cable.
Compare resistance with table.

Affected parts

Fühler TC1

Safety note

230V — isolate power.

Source: Bosch resmi servis kılavuzu — Alarm List 8754, code 5207, Display Code A01, Installer: "Info Temp. sensor TC1 open circuit — Warning if resistance of sensor > 30 kOhm." TC1 is the heat-carrier outlet sensor (Wärmeträger-Austritt), matching the app's TC1 description; note the app's phrasing 'fehlerhaft' more p…

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