Fault Codes / Wolf / 121

CHA / BWL — 4-way reversing valve not switching.

Possible causes

• Reversing valve or coil faulty.
• Faulty wiring/control signal.

Check steps

• Check coil & control signal.
• Check valve for mechanical sticking.

Affected parts

• 4-Wege-Umschaltventil
• Ventilspule

Safety note

Source: Wolf resmi Fehlercode-Liste PDF (emax-haustechnik.de) — 121 4-Wege-Umschaltventil schaltet nicht beim Abtauvorgang

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

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