F91 - Vogelsang Klimatechnik: Zukunftsweisende Gewerbekälte & Klimasysteme

F91

Malfunction Decision Conditions

The input current is low while the compressor is running at higher than the setting frequency.

Malfunction Caused

Lack of gas.
3-way valve close.

Troubleshooting

When F91 indication happens

⚠

Caution For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

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Check 3 way valve

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3-way valve opened?

NO, closed
→

Open 3 way valve

YES

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Check for gas leaking source (Refer to H16)

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Gas leaking?

YES
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Check for gas leaking source;
Repair or replace defected part(s)
Re-claim and then re-charge the right amount

NO, gas amount is OK

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Check other parts in refrigeration cycles