Carter-Hoffmann BR1000 - Manual (Page 11)

11
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 automatically, 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 Cabinet temp above setpoint
(setpoint too low) Turn thermostat setpoint up
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 Setpoint too high Change setpoint
Thermostat damaged Replace thermostat
Defective hi-limit control Replace hi-limit
Blower fan jammed Find source of fan binding
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
Blower motor not running