Carter-Hoffmann MDPM4 - Manual (Page 13)

13
TROUBLESHOOTING GUIDE
NOTE:
The technical content of this manual, including any
wiring diagrams, schematics, parts breakdown
illustrations and / or adjustment procedures, is
intended for use ONLY by qualified technical
personnel.
NOTE:
For warranty service, call Carter-Hoffmann direct at
800-323-9793 for authorization, we will dispatch the
nearest authorized service agency.
SYMPTOM DISPLAY READS PROBABLE CAUSE CORRECTIVE ACTION
NO POWER Blank Faulty circuit breaker tripped Reset circuit breaker
Input cable to controller unplugged Plug in power cable
Faulty transformer Replace
Faulty controller Replace
Faulty ON/OFF switch Replace
Faulty wiring Follow wiring per diagram
NO HEAT / LOW TEMP Ambient air temperature Hi Limit faulty or tripped Reset/Replace
Faulty heat element Replace
Faulty relay Replace
Faulty air probe Replace
Faulty controller Replace
CONTROLLER LED’s LED segments are out /
dim
Loose wiring Follow wiring per diagram
Faulty controller Replace
CONTROLLER READS
ERROR CODE
Actual error code Faulty probe connection Check wiring
Faulty probe Replace probe
Faulty controller Replace
PRODUCT NOT HOT
ENOUGH
Wrong setting or menu being used Correct temperature setting
Temperature out of calibration Perform temperature verifi-
cation test (page 9)
Product is not at proper serving
temperature prior to being placed in
cabinet
Cook product to proper
temperature prior to placing
in cabinet
FUNCTION KEY DOES
NOT OPERATE
Normal Faulty controller Replace
Normal