Carter-Hoffmann CAA144 - Manual (Page 10)

10
TROUBLESHOOTING SUGGESTIONS
PROBLEM PROBABLE CAUSE POSSIBLE REMEDY
No power to unit,
No light on display
Motor not running Not plugged in or circuit breaker off or
tripped Plug into receptacle. Reset circuit
breaker, check facility circuit breaker
Main switch damaged Check main power switch, replace if
damaged
Damaged power cord Replace cord
Hi-limit safety tripped Allow unit to cool, hi-limit will reset auto-
matically, or replace
Unit does not hold temperature Damaged door gasket Replace gasket
Damaged door latch Replace defective latch
Temp probe damaged Replace probe
Door gap, out of alignment Adjust door hinging and strike
Unit does not heat / cool Cabinet temp above set point (heat)
Cabinet temp below set point (refrig.) Adjust thermostat set point
Check thermometer calibration
Damaged wiring Repair wiring
Damaged relay Replace relay
Damaged controller Replace controller
Damaged heating element Perform ohm reading, Replace element
Unit overheats Set point too high Change set point
Thermostat damaged Replace thermostat
Defective hi-limit control Replace hi-limit
Blower fan jammed Find source of fan binding
Blower motor not running Damaged fan motor Replace motor
Blower fan jammed Find source of fan binding
Relay is “chattering” Check proper wiring to switch Repair wiring or replace switch
GENERAL MAINTENANCE INSTRUCTIONS
CASTERS
Some casters are equipped with Zerk grease fittings so that they may be easily lubricated with a grease gun.
Recommended lubrication is at least once every six months. Lubrication will be required more frequently if carts
are cleaned with a hot water or steam cleaning system. Casters with special bearings are recommended for fre-
quent cart wash or steam cleaning situations.
LATCHES
Check frequently to insure that all door latches are secure. Latches may become “sticky” due to residue build-up
from daily use and cleaning. Lubricate latches regularly with WD-40, silicone spray, graphite or other commercial
lubricants for stainless steel products. Do not use oil.
PERIMETER BUMPERS
Vinyl which has been dislodged from the channel due to severe bumping or scraping can be pried back into
place with a common screwdriver.
CONTROLLER MAINTENANCE
Routine maintenance is not required. A periodic check of the system calibration is recommended. The controller
is not field serviceable. Call for service if repair is needed.