Troubleshooting - Electrolux 30" Service Manual

SECTION C - SURFACE ELEMENT
CONTROL SYSTEMS
Three types of surface element control systems are cov-
ered in this manual.
1. Standard infinite switch.
2. Dual infinite switch.
3. Electronic top element system. (ESEC 5)
Standard infinite switch:
The surface elements and standard infinite switches pro-
vide an infinite choice of heat settings for cooking. Con-
trols are safety type and must be pushed in before turn-
ing. All surface controls are marked on the control panel
for their respective heating element. Power is supplied
to the surface elements through the infinite switch con-
tacts L1 - H1 and L2 - H2. During actual surface ele-
ment operation, if the control is set to the high position
contacts L2 - H2 are lock closed providing continuous
power to the element. In all other settings contacts L2 -
H2 will cycle to maintain the correct heat setting. Con-
tacts L1 - P provide power to the surface element indica-
tor light.

Troubleshooting:

There are four ways a surface control system with a
standard infinite switch can fail.
1. The element does not heat.
2. The switch does not cycle the element off and on
when set to a position other than high.
3. The element operates correctly, but the indicator light
does not glow.
4. Indicator light glows with all infinite switches in the
off position.
NOTE: If the indicator light glows very dimly with all
the switches in the off position. This problem is
caused by a capacitive feed over in the wiring
and can be corrected by connecting a
100,000 Ohm 1/4 watt resistor in parallel with
the light.
Continuity tests can be performed on the infinite switch
contacts. All tests should be performed with power to
the range disconnected, and wiring removed from the
switch. Set an ohmmeter on R X 1K scale and check
the contacts in the following chart and switch terminal
diagram.
Contact
OFF
L1 - P O
L1 - H1 O
L2 - H2 O
Element does not heat:
Checking the system with a Voltmeter, if the element
does not heat up.
1. Disconnect power, roll the control panel forward to
expose the switch terminals and reconnect power.
2. With a Voltmeter set for AC on a scale higher than
240 Volts, measure the voltage drop between
terminals L1 and L2. If the meter reads zero the
wiring between the main terminal block on the range
and the switch is open. If the meter reads line to
line voltage (around 240 VAC) go to step 3.
3. With the switch turned to the high position measure
the voltage drop between terminals H1 and H2. If
the meter reads zero the switch is defective. If the
meter reads line to line voltage the switch is good. If
the range has standard elements go to step 4. If the
range has a glass smooth top go to step 5.
Note: Some models with a large left rear coil element
have a safety thermostat in series with the left rear ele-
ment. If 240 VAC is read between H1 & H2 and the
element does not heat check the wiring diagram to see
if this model is equipped with a safety thermostat. If it
is, set the switch on high and measure voltage drop across
the terminals of the safety thermostat. If the meter reads
240 VAC reset or if necessary replace the thermostat. If
the meter reads zero, check between the terminals of
the terminal block. If the meter reads zero the terminal
block or the wiring between the switch and the terminal
block is open. If the meter reads line to line voltage the
element is defective
32
Dial Position
LO-MED HI
X X
X X
X - C X