Oven control

Check for 24 VAC supply to control. If no voltage is present,

 

 

trace wiring back to control transformer. If 24 VAC is present,

 

 

check for a read-out on the control display. If there is 24 VAC

 

 

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 120 VAC at temperature regulation valve. If there is

 

 

voltage at the temperature regulation valve, proceed to

 

 

“temperature regulation valve” for next check. If there is no

 

 

voltage at the temperature regulation valve, 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.

 

Thermocouple

Check to be sure that the thermocouple is securely connected to

 

 

the oven control. If the thermocouple is connected to the oven

 

 

control, and the control indicates “LP FAIL” or “RP FAIL”,

 

 

disconnect the thermocouple from the oven control and measure

 

 

the resistance of the thermocouple. The left thermocouple

 

 

should read approx. 21Ω. The right thermocouple should read

 

 

approx. 11Ω. If these readings are not achieved, replace the

 

 

thermocouple. If these readings are correct, proceed.

 

Oven control

If the thermocouple checks good, but the oven control display

 

 

indicates that there is a thermocouple failure, replace the oven

 

 

control. If the oven control indicates a temperature reading but

 

 

the oven will not heat, proceed.

 

Thermocouple

WITH POWER ON AND THERMOCOUPLE ATTACHED TO

 

 

THE OVEN CONTROL: Measure the DC millivolt output of the

 

 

thermocouple. Refer to the thermocouple chart (located in the

 

 

“Removal” section of the manual) for proper millivolt readings. If

 

 

these readings are not achieved, replace thermocouple.

 

Oven control

If the thermocouple checks good, but there is no 120VAC output

 

 

to the temperature regulation valve, replace the oven control. If

 

 

there is 120VAC output to the temperature regulation valve,

 

 

proceed.

 

Temperature

Check for 120VAC supplied to temperature regulation valve. If

 

regulation valve.

voltage is present, listen for valve to open and close. Also check

 

 

for opens or shorts in the operating coil. Replace temperature

 

 

regulation valve as needed.

Intermittent heating

Thermal/overload of

The main fan motors and burner blower motors are equipped

 

main fan and burner

with internal thermal protection and will cease to operate if

 

blower motors

overheating occurs. As the motors overheat and then cool, this

 

 

will cause the heating systems to cycle on and off intermittently.

 

 

Improper ventilation or lack of preventive maintenance may

 

 

cause this problem. Also, most of the problem listed under

 

 

“Oven will not heat” can cause intermittent failure.

Conveyor will not run

Power supply

Check for incoming voltage at line 1 to neutral. There should be

 

 

a voltage reading of 120VAC. If not present, check circuit

 

 

breakers.

 

Power switch

Check continuity between switch terminals. Replace switch as

 

 

needed.

 

Fuse, 10 Amp

Check, replace if necessary.

 

Fuse holder

Check, replace if necessary.

Low Profile – 1600 Series Advantage Digital Service Manual – Domestic

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Lincoln 1601-000-A, 1600-000-A service manual With Power on and Thermocouple Attached to

1601-000-A, 1600-000-A specifications

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