Fault Codes / Daikin / AC

DAI

Daikin AC

High

Altherma — Booster heater (BSH) overheated.

Daikin AC: Booster heater (BSH) overheated. This fault noticeably affects operation.

Possible causes

Poor tank flow/filling.
BSH thermal cutout tripped.

Check steps

Check tank/heat exchanger & filling.
Reset/check BSH thermal cutout.

Affected parts

Booster-Heizung (BSH)
Thermosicherung

Safety note

230V & hot water — caution.

Source: Daikin Altherma 3 Installer Ref. 4P685228-1A (2022.05) §15.4

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

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