Whirlpool WED99HEDW0 Technical Education page 87

Heater will not shut off:
1. Unplug dryer or disconnect power.
2. Remove top panel to access the machine electronics.
3. Remove connector P14 from the CCU and measure the
resistance between P14-3 and P14-6 at the connector.
Refer to "Outlet Thermistor Resistance" table on page
6-14 for temperatures and their associated values.
¾ If the resistance corresponds to the temperature, the
outlet thermistor is good.
¾ If the thermistor resistance does not agree with the
table, replace the outlet thermistor.
4. Check heater coil for a short to ground (usually inside the
heater box). Repair or replace if necessary.
5. Plug in dryer or reconnect power.
6. Run a Load Diagnostics Test. Check heater relay output on
CCU. Unplug dryer or disconnect power. With a voltmeter
set to AC, connect voltmeter to terminals 1 & 2 for heater
relay. Plug in dryer or reconnect power. Measure the
voltage across terminals 1 & 2 for heater relay.
¾ If voltage is present (~240VAC), the relay is open and
working normally.
¾ If little or no voltage is present, the relay is closed and
heater is activated. Unplug dryer or disconnect power
and replace the CCU.
7. Unplug dryer or disconnect power.
8. Reassemble all parts and panels.
9. Plug in dryer or reconnect power.
10. Perform steps under "Install Diagnostics", page 5-4, to
verify repair.
Heater Element
Heater
Terminals
≤ 50 Ω
Figure 1 - Heater Assembly
For Service Technician Use Only
Figure 2 - Inlet Duct & Heater Assembly
HybridCare™ Dryer with Heat Pump Technology
TESTING
Heater Assy
High Limit
Thermostat
Heater
Terminals
n
6-11