268 - INVERTER A/F (ONLY AMS 10-8)
Does the fault remain when the
power supply unit is reset?
NO
NO
YES
Does the compressor function?
YES
Is the voltage betweenT26 and
T27 for 380 - 390 V DC ?
OK
Is IC2 damaged?
NO
Replace the inverter board.
YES
YES
NO
277 - S. FAULT THO-R
Is the evaporator’s temperature
sensor (Tho-R1, R2) correctly
connected?
YES
YES
Replace the control board.
Action.
Defective sensor - replace.
Are the characteristics of the
evaporator’s temperature sensor
(Tho-R1, R2) OK?
NO
NO
Sensor data can be found on page 14.
57Chapter 6 | TroubleshootingNIBE AMS10
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