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CN 2110 Temperature Controller
CN 2110
23
Section 9–Troubleshooting
Symptom Probable Cause Correction Steps
Troubleshooting
continued
Process not
in control
Instrument continu-
ally goes through
power-up reset
Display reads
FAn FAIL, CN
2110 disables
control output
1. Incorrect settings
2. Thermocouple
Wiring
1. Severe electrical
noise
1. Fan for T10 output
has failed
1. Check Proportional
Band setting and
Automatic Reset
setting
2. Check thermocouple
polarity
1. Separate sensor wiring
from other wiring
2. Apply power line filter
3. Contact Omega
1. Check for and clear any
obstruction in fan, then
power unit up and
check display
2. Discontinue operation,
replace fan assembly,
or return to Omega for
replacement