Shellab SMO5-2 - Manual (Page 11)

TROUBLESHOOTING
TEMPERATURE
Temperature too high.
1/ Controller set too high-see section 6.3
2/ Controller failed on
– call Customer Service.
3/ Wiring error – call Customer Service.
Display reads "HI" or "400"+.
Probe is unplugged, is broken or wire to sensor is broken – trace
wire from display to probe; move wire and watch display to see
intermittent problems
Chamber temp spikes over set point
and then settles to set point.
Recalibrate – see section 6.4.
Temperature too low
1/ High limit set too low – see section 6.5.
2/ Controller set too low – see section 6.3.
3/ Unit not recovered from door opening – wait for display to stop
changing.
4/ Unit not recovered from power failure or being turned off
–
ovens will need several hours to warm up and stabilize.
5/ Element failure
– compare current draw to data plate.
6/ Controller failure – call Customer Service.
7/ High limit failure – confirm with front panel lights that Safety
Thermostat is operating correctly.
8/ Wiring problem
– check all functions and compare wiring to
owners manual - especially around any areas recently worked on.
9/ Loose connection
– check control panel for loose connections.
Display reads "LO"
1/ Bad probe or disconnected – call Customer Service.
2/ If ambient temperature is lower than range of unit – compare set
points and ambient temperature to rated specifications in section
9.0.
Unit will not heat over a temperature
that is below set point
1/ Confirm that fan is moving and that amperage and voltage
match data plate
– check for air movement in chamber.
2/ Confirm that set point is set high enough –turn Safety
Thermostat all the way clockwise and see if OTP light comes on.
3/ Check connections to sensor.
4/ Check calibration
– using independent thermometer, follow
instructions in section 6.4.
Unit will not heat up at all
1/ Check amperage – amperage should be virtually at maximum
rated (data plate) amperage.
2/ do all controller functions work?
3/ Is the Safety Thermostat set high enough?
– for diagnostics,
should be fully clockwise with the OTP light never on.
4/ Has the fuse/circuit breaker blown?
5/ Has timer turned unit off?
Section
8