Nortec MH Series - Manual (Page 76)

73 | Troubleshooting
Digital Humidistat
Symptom Cause Corrective Action(s)
Humidistat Reading incorrectly 1 Sensor out of calibration 1 Check reading against known
reliable instrument. If out of
calibration it can be field calibrated
±10%. Press buttons together
until calH appears on the display.
Press to display the current
calibration trim. Adjust using 
buttons. Press  button when done.
2 Improper sensor location 2 Check that the humidistat is
positioned in a location
representative of room humidity.
3 Exposed to draft or heat source 3 Check that heat/cold fluctuations,
drafts, sunlight, doors, or vents are
affecting the reading.
4 No vapour barrier 4 Insure drafts cannot affect reading
by ensuing vapour barrier is in place
and working.