Bosch A01 (5426)

Medium

Compress — Temperature sensor TR5 — open circuit.

Bosch A01 (5426): Temperature sensor TR5 — open circuit. This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Sensor TR5 or signal cable open.

Check steps

Check sensor TR5 & signal cable.
Compare resistance with table.

Affected parts

Fühler TR5

Safety note

Follow F-Gas.

Source: Bosch/IVT/Buderus Compress Wärmepumpe Alarm-Tabelle (lvisawo.fi/jseducation.se resmi servis kılavuzu aynası) — Confirmed via direct PDF read p.19: code 5426, Installer, 'Warning Z1 Suction gas temperature sensor TR5 open circuit', broken circuit (>179 kOhm).

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

Look up in Enthalio →

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)