88 Chromalox 2104 Technical Manual
Troubleshooting Guide
Symptom Probable Cause Correction
Process not in control 1.Incorrect “control action” 1.Check “control type” entered
selected CTRL PAGE, CONT
2.Not tuned correctly 2.See Self-Tuning and PID
settings, CTRL PAGE
Instrument continually goes 1.Internal electronic failure 1. Contact factory
through power-up reset 2.Drastic power line
anomalies
ERR3 displayed with 1.EEPROM failed 1.Power down and back up to
PAGE in lower display redundancy check retest EEPROM
2.Set controller to Level D (736)
Security Code.
3.Go to PAGE shown. Use RESET
pushbutton to scroll through
all menus. Readjust any
settings that appear incorrect.
After scrolling through all
menus, error will clear.
ERR4 displayed 1.A to D electronics failure 1.Power down and up to reset
2.Consult factory
TERR flashing on upper 1.Self-tune was enabled, 1.Press RESET to clear error.
or lower display but unable to Previous PID parameters
successfully tune are retained
because: 2.Consult factory
a.process could not get
50°F below setpoint
(for heating) or 50°
above setpoint (for cooling)
in 30 minutes
b.over a 10 hour period,
the process has not
changed enough to
initiate turning
c.process went in and
out of sensor range
during tune.
d.2104 is unable to
calculate PID parameters
LOOP error See pages 55-57 1.Press RESET to clear error
2.Verify wiring and external
devices
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