Nibe F2040 - Page 70

277 - S. fault Tho-R
Is the heat exchanger's
temperature sensor (Tho-R1, R2)
correctly connected?
YES
YES
Replace the control board.
Action.
Defective sensor - replace.
Are the characteristics of the heat
exchanger's temperature sensor
(Tho-R1, R2) OK?
NO
NO
NIBE™ F2040Chapter 6 | Troubleshooting68