Thermo King UT-1200, Manual

Page: 156 / 169

Electric Standby Diagnosis
156
Contact chatter Low battery voltage Check voltage condition. Check
momentary voltage dip during
starting—low voltage prevents
magnet sealing
Defective or incorrect coil Replace coil
Poor contact in control circuit Check auxiliary switch contacts and
overload relay contacts. Check for
loose connections in control circuits
Contact welding or freezing Abnormal in-rush of current Check or grounds, shorts or
excessive motor load current
Low voltage Correct voltage condition. Check
momentary voltage dip during
starting
Foreign matter prevents contacts
from closing Clean contacts
Rapid cycling Check for cause of short cycling
(such as thermostat)
Short circuit Correct fault
Battery is not recharging Loose alternator belt Tighten belt
Loose connections in electrical
system Check all electrical connections and
charging system
Worn brushes in alternator Repair
Voltage regulator faulty Replace
Battery defective Replace
Alternator defective Repair or replace
Dirty battery terminals Clean and retighten
Condition Possible Cause Remedy