Fault Codes / Bitzer / 4221

Bitzer 4221

High

ECOLINE / Frequenzumrichterbetrieb — Motor Frequency High (VFD operation)

Bitzer 4221: Motor Frequency High (VFD operation) This fault noticeably affects operation.

Possible causes

VFD set above the maximum allowable frequency (70Hz)
Trans-synchronous operation without consulting BITZER application engineering

Check steps

Check maximum frequency per compressor series and reparametrize VFD
For operation above 60-70Hz, consult BITZER AE department

Affected parts

Frequenzumrichter/VFD
Motor

Safety note

Disconnect main power before working on the VFD.

Source: Bitzer resmi servis kilavuzu (bagimsiz cift-dogrulandi) — BITZER CM-SW-01 Reference Manual, §9.3 "Alarm list" (ManualsLib mirror, p.23): code 4221 = "Motor frequency high", fault type = Restart. Independently verified by fetching ManualsLib pages 22 and 23 directly (page 22 confirms the "9.3 Alarm list" section header and shows the table running from codes 1000 up throu…

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