The Honeywell HSS-DPS dew point sensor indicator ( red LED ) is flashing c. 0.5Hz indicating humiidity > 90+/-3 %

Hanna HI9565 report d.p. 8.3 deg C, RH 36%, temperature 25 deg C

S4 area coolant water cntrols indicate water temperature 19 deg C. No evidence of condensation on AIDA coolant manifold.

Sensor fault?