Bosch A01 (5269)

High

Compress — 5269 is NOT a 'flow too low' alarm — it is the electric booster heater (EE) high-temperature cutout on sensor TC1 (>87°C, resets <80°C). Low-flow alarms belong under code 5252.

Bosch A01 (5269): 5269 is NOT a 'flow too low' alarm — it is the electric booster heater (EE) high-temperature cutout on sensor TC1 (>87°C, resets <80°C). Low-flow alarms belong under code 5252. This fault noticeably affects operation.

Possible causes

Strainer clogged / air in system.
Weak pump / valves partly closed.

Check steps

Clean strainer, bleed, open valves.
Check pump & adequate flow.

Affected parts

Umwälzpumpe
Schmutzfilter

Safety note

Depressurize/isolate the unit.

Source: Bosch resmi servis kılavuzu — DÜZELTİLDİ: Bosch Alarm List, A/W Split (8754), 2018-01-10, p.8 (source PDF independently fetched from https://lvisawo.fi/data/dokumentit/bosch/vikakoodit/BOSCH-Vikakoodit-Ilma-vesilampopumppu-Compress-3000-AWS-Split.pdf): Code 5269, Display level "Customer", Alarm text "Alarm Z1 Additional…

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Related fault codes

No EMS BUS communication / internal connectionA11 Booster heater limiter (STB) or pressure switcA01 (5246) Hot gas temperature too high (TR6 > 110–120H01 (5311) Z1 phase monitor tripped: one or more supply-vA01 (5273) High pressure guard MR1 tripped.H01 (5508) Compressor control failure – not running / locA01 (5350)