Lincoln 1628-000-A - Manual (Page 5)

Low Profile – 1600 Series Adv Dig Electric S.M. – Int’l 5
Cooling fan thermostat(s) Check the cooling fan thermostat. (Thermostat closes
at 49
° C and opens at 38 ° C). With the cooling fan
thermostat preheated, check for continuity. If switch is
open, replace.
Fuse, 3 A., cooling fan Check, replace if necessary.
Fuse holder Check, replace if necessary.
Cooling fan(s) Supply voltage should now be at these motors. If
voltage is present, check motor for opens, shorts or
grounds. WITH POWER OFF: Check for locked rotor.
Fan switch Check to see that the fan switch is on. Oven will not heat
Main oven fan Check if main oven fan is operating. If not, refer to
“Oven fan will not run”.
NOTE: These ovens utilize 2 complete /Temperature control systems. Each system will Follow the same
troubleshooting sequence.
Oven control relay Check for line voltage to the relay coil. If no voltage is
present, trace wiring back to the control box hi-limit
thermostat(s). If voltage is present, check to insure
contacts are closing. Replace relay as needed.
Thermostat, oven cavity hi-limit Terminals are normally closed. If open, reset and test
oven for proper operation. If thermostat will not hold
for maximum oven temperature, and oven is not
exceeding maximum temperature dial setting, check
for proper location of capillary bulb in its spring holder
If above checks OK, replace hi-limit.
Contactor, hi-limit Check for line voltage to the contactor coil. If no
voltage is present, trace wiring back to the oven cavity
hi-limit thermostat(s). If voltage is present, check to
insure contacts are closing. Replace contactor as
needed.
Fuse, heater, 50A. Check, replace if necessary.
Fuseholder Check, replace if necessary.
Control transformer Check for supply voltage to the primary of the control
transformer. If no voltage is present, trace wiring back
to the oven control relay. If primary voltage is present,
check for 24VAC at the transformer secondary. If
there is primary voltage, but no secondary voltage,
replace control transformer.
Oven control Check for 24VAC supply to control. If no voltage is
present, trace wiring back to control transformer. If
24VAC is present, check for a read-out on the control
display. If there is 24VAC supplied, but there is no
read-out on the control display, replace the oven
control.
If there is a read-out on the control, set the control to
maximum temperature (see installation operations
manual for temperature adjustment). With the control
set at maximum temperature, check for line voltage at
the heat relay (mercury contactor). If there is voltage
at the heat relay, proceed to “Heat relay” for next
check. If there is no voltage at the heat relay, trace
wiring back to the oven control. If there is no voltage
output at the oven control, check the read-out on the
control. If the control reads “LP FAIL” or “RP FAIL”,
this indicates that the thermocouple has failed or has
become disconnected from the control. “LP FAIL”
indicates a problem with the left thermocouple probe,
and “RP FAIL” indicates a problem with the right
thermocouple probe.