278 - SENSOR FAULT THO-A
Is the outdoor sensor (Tho-A)
correctly connected?
YES
YES
Replace the control board.
Action.
Defective sensor - replace.
Are the characteristics of the
outdoor sensor (Tho-A) OK?
NO
NO
Sensor data can be found on page 14.
279 - S. FAULT THO-D
Is the hot gas sensor (Tho-D)
correctly connected?
YES
YES
Replace the control board.
Action.
Defective sensor - replace.
Are the characteristics of the hot
gas sensor (Tho-D) OK?
NO
NO
Sensor data can be found on page 14.
NIBE AMS10Chapter 6 | Troubleshooting58