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8. Ignitor (Figure 6)
The nitride ignitor used units is made from a proprietary
ceramic material. To check ignitor, measure its resistance
and voltage. A value of 39 to 70 ohms indicates a good ig
-
nitor. Voltage to the ignitor should be 120VAC. See figure
8 for resistance, and voltage check.
NOTE -
The ML180UDFE(X) furnace contains electronic
components that are polarity sensitive. Make sure that the
furnace is wired correctly and is properly grounded.
Test 1
Check ignitor circuit for correct resistance
.
Remove 4-pin plug from control.
Check ohms reading across terminals 2 and 4.
If value is correct (39 to 70 ohms), this is the only test
needed.If the reading on the meter is not correct,
(0 or infinity) then a second test is needed.
Test 2
Check ignitor for correct resistance
.
Seperate the 2-pin jack-plug near the manifold and check
resistance of ignitor at the plug. Reading should be
between 39 and 70 ohms. If the reading is correct, then
the problem is with the wiring between the jack-plug and
the control. If reading is not correct, the issue is the ignitor.
Test 3
Check ignitor for correct voltage
Insert meter probes into terminals 2 and 4 (use small
diameter probes in order not to damage plug).
Check voltage during 20 second ignitor warm up period.
Voltage should read 120 volts + 10%. If voltage reads below
these values, check for correct supply voltage to furnace.
Integrated Control Bo
Detail
Test 1
Integrated Control Board
Detail
Integrated Control Board
Detail
FIGURE 8
