Carter-Hoffmann SR1820 - Manual (Page 11)

11
TROUBLESHOOTING GUIDE
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 automatically, or replace
Unit does not hold temperature Damaged door gasket (metal
trim strip)
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 Cabinet temp above setpoint
(setpoint too low) Turn thermostat setpoint up
Check thermometer calibration
Internal wiring error Call service technician
Damaged relay Call service technician
Damaged controller Call service technician
Damaged heating element Perform ohm reading,
Replace element
Unit overheats Setpoint too high Change setpoint
Thermostat damaged Replace thermostat
Defective hi-limit control Call service technician
Blower fan failure Call service technician
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
Takes too long to get to tem-
perature Improper voltage Call service technician to verify
that incoming voltage matches
cabinet specifications
NOTE:
The technical content of this manual, including
wiring diagrams, schematics, parts breakdown
illustrations and/or adjustment procedures, is
intended for use ONLY by qualified techni-
cal personnel. NOTE:
For warranty service, call Carter-Hoffmann
direct at 800-323-9793 for authorization. We
will dispatch the nearest authorized service
agency.