Wolf 704

Medium

CHA / BWL — Hot gas fault (S-HG) — maximum temperature in the hot gas refrigerant circuit exceeded.

Wolf 704: Hot gas fault (S-HG) — maximum temperature in the hot gas refrigerant circuit exceeded. This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Low refrigerant charge, high pressure ratio, or compressor overload.

Check steps

Check refrigerant charge and operating pressures.

Affected parts

Verdichter

Safety note

Hot discharge line — burn hazard.

Source: Wolf Fehlercode-Liste (offizielle Wolf-Dokumentation), Abschnitt "Fehlercodes der Wärmepumpen BWL" (emax-haustechnik.de Spiegel)

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

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Related fault codes

Compressor fault.105 Fan fault.104 Low pressure fault (refrigerant circuit).108 High pressure fault (refrigerant circuit).109 Hot gas temperature fault.111 4-way reversing valve not switching.121