Test #4D: Gas Valve - Whirlpool WED9500E SERIES Service Manual

COMPONENT TESTING
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or
electrical shock.
TEST #4d: Gas Valve (Gas Dryer)
1. Unplug dryer or disconnect power.
2. Access the gas valve by sliding the top back and removing
the front panel, front bulkhead, and drum.
3. Use an ohmmeter to determine if a gas valve coil
has malfunctioned. Remove harness plugs. Measure
resistance across the terminals (see figure 1). Readings
should match those shown in the following chart; if not,
replace coils.
GAS VALVE RESISTANCE
GAS VALVE RESISTANCE
Terminals
Terminals
1 to 2
1 to 2
1 to 3
1 to 3
4 to 5
4 to 5
Black
Light Blue
White
Figure 11 - Measuring gas valve resistance.
Figure 1 - Measuring gas valve resistance.
3-16 Whirlpool & Maytag 9.2 Cu. Ft. Steam Dryer
n
If resistance readings are outside the range
or open, replace the ignitor.
For Service Technician Use Only
Resistance
Resistance in ohms
in ohms
1400 ± 70
1400 ± 70
570 ± 28.5
570 ± 28.5
1300 ± 65
1300 ± 65
White
Light Blue
4. Disconnect the ignitor plug from the burner. Using an
ohmmeter, measure the resistance across the ignitor's
2-pin connector. Resistance should be 50-500 Ω.
¾ If resistance readings are outside the range or open,
replace the ignitor.
¾ If resistance readings are within range, reconnect the
ignitor plug and continue to step 5.
5. Disconnect the wires going to the flame sensor terminals.
Using an ohmmeter, measure across the two sensor
terminals for continuity.
¾ If there is continuity, reconnect the sensor wires and
continue to step 6.
¾ If the reading is open, the flame sensor needs
replacing.
6. Reassemble all parts and panels before reconnecting
power.
7. Plug in dryer or reconnect power.
8. Run a high-temp MIXED + TIMED DRY cycle of at least 2
minutes in duration.
9. Watch the ignitor for a couple of minutes through the
"peek window" in the side. If the ignitor stays red hot and
the gas does not come out and ignite, the flame sensor
needs replacing.
NOTE: If ignitor does not come on, line voltage may not
be present at the gas burner. The motor centrifugal switch
may be suspect.
IMPORTANT: To avoid damage to the gas burner wire
harness, ensure the harness is routed exactly as it was
prior to service.
10. Unplug dryer or disconnect power.
11. Reassemble all parts and panels.
12. Plug in dryer or reconnect power.
13. Perform steps under "Service Test Mode", page 2-5, to
verify repair.
Gas Valve Schematic
2
1400 ± 70 Ω
Figure 2 - Gas Valve Schematic
50-500 Ω
3
1
570 ± 28.5 Ω
4 5
1300 ± 65 Ω