Lincoln Foodservice 1633-000-EA, Parts & Service Manual

Low Profile –1600 Series Advantage Digital Service Manual – Int’l 

10 

Intermittent heating 

Thermal overload of main fan 
and burner blower motors 

The main fan motors and the burner blower motors 
are equipped with internal thermal protection and will 
cease to operate if overheating occurs. As the motors 
overheat and then cool, this will cause the units to 
cycle on and off intermittently. Improper ventilation or 
lack of preventive maintenance may cause this 
problem. Also, most of the problems listed under 
“Oven will not heat” can cause intermittent failure. 

Power supply 

Check for supply voltage at terminals L1 and L2. If 
voltage is not present check breakers. 

Power switch 

Check continuity between switch terminals. Replace 
switch as needed. 

Fuse, 10 Amp. 

Check and/or replace. 

Fuse holder 

Check and/or replace. 

Hi-limit thermostat(s),        
control box 

Check for voltage on both sides of the switch. 
Terminals are normally closed. If open, reset and test 
for proper operation. If thermostat will not hold, and 
the control box temperature is not exceeding 140

°

F 

(60

°

C), replace thermostat. 

Relay, oven power 

Check for line voltage to the relay coil. If voltage is not 
present, trace wiring back to the hi-limit thermostat. If 
voltage is present, check to insure contacts are 
closing. Replace relay as needed. 

Control transformer 

Check for line voltage supply to the primary of the 
control transformer. If no voltage is present, trace 
wiring back to the oven power relay. If voltage is 
present, check for 24VAC at the transformer 
secondary. If there is primary voltage, but no 
secondary voltage, replace control transformer.   

Conveyor motor 

Check for line voltage supply to the conveyor motor at 
wire #28 to neutral. If no voltage is present, trace 
wiring back to the oven power relay. If voltage is 
present and the motor will not run, check the motor 
windings for opens or shorts. 
WITH POWER OFF: Check the motor windings as 
follows: 
Grey to black -    116

Ω

Grey to brown  -  116

Ω

Brown to black -  230

Ω

Conveyor will not 
run 

Capacitor, conveyor motor 

Check for shorts or grounds. Replace capacitor as 
needed.  
WARNING: Capacitor has a stored charge, discharge 
before testing. 

Switch, conveyor reversing 

Check continuity between switch terminals, Replace 
switch as needed. 

Oven control 

If there is supply voltage to the motor. And the motor, 
capacitor, and reversing switch check good, replace 
the oven control.  

NOTE: Display will indicate   
“Belt jam” 

Conveyor motor 
runs, but there is 
no speed display 

Oven control  

Check for output voltage from the oven control to hall 
effect sensor (sensor is located in conveyor motor). 
Measure voltage at the motor connector, red wire and 
yellow wire. Voltage should be approx. 10VDC. If no 
voltage is present, trace wiring back to oven control. If 
there is no voltage present at the oven control, 
replace the oven control.