Wolf 703

Critical

CHA / BWL — Anti-freeze protection (S-FRO) triggered — heat pump running but temperature drops below the anti-freeze limit.

Wolf 703: Anti-freeze protection (S-FRO) triggered — heat pump running but temperature drops below the anti-freeze limit. This fault typically halts operation and needs immediate attention.

Possible causes

Insufficient water flow in the heating circuit or insufficient heat source.

Check steps

Check water flow, circulation pump, and heat source.

Affected parts

Umwälzpumpe

Safety note

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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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