Motor overload relay (F21) triggered: Reset the overload once. If the problem persists, get in touch with us. Circuit breaker (Q15) or fan motor overload (F15) triggered: Reset the overload once. If it continues to occur, contact us. Motor thermistor (K34) tripped or faulty: Reset the overload once. If the issue repears, get in touch with us. Phase sequence relay (K25) open: Verify and correct the phase sequence at the machine's power inlet if necessary. Wiring interruption: Contact us for futher diagnosis