Danfoss E26

High

AK-CC 550A — S4 sensor error (discharge air)

Danfoss E26: S4 sensor error (discharge air) This fault noticeably affects operation.

Possible causes

Sensor S4 defective, cable break or short circuit
Sensor thermally overloaded or mechanically damaged

Check steps

Measure resistance/signal of S4 and compare against expected value
Check S4 wiring, replace sensor if needed; use U16 to verify

Affected parts

S4 sensor (discharge air)
Sensor cable/connector

Safety note

De-energize before replacing the sensor.

Source: Danfoss resmi servis kilavuzu (bagimsiz cift-dogrulandi) — Danfoss AK-CC 550A Pocket Guide, Service Guide, AX278928624187en-000101, © Danfoss ADAP-KOOL 2018.08, p.2. "Alarm Codes" table: "E26 | S4 Sensor Error". "Sensor / Relay Checks" table: "U16 | S4 Sensor (Discharge Air)". Anlam: Sensorfehler S4 (Discharge Air / Austrittstemperatur-Fühler). Not: kaynak dokümanda "…

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

Look up in Enthalio →

Related fault codes

High temperature alarm (High Temp)A1 Pressure transducer error (Press.Xdcr Error)E20 S2 sensor error (coil outlet)E24 S3 sensor error (return air)E25 High temperature alarm (too warm).A1 Low temperature alarm (too cold).A2