Whirlpool WED90HEFC W10240504 - Page 16

FOR SERVICE TECHNICIAN'S USE ONLY NOTE: On the gas dryer, the inlet thermistor is located below the CCU bracket at the drum inlet vent. Refer to strip circuit on page 23 to diagnose heater system. Dryer does not heat: Locate the components using figures 10 and 11. To access heater system components, see Dryer Disassembly Instructions, page 24. ELECTRIC DRYER ONLY: 3 Quick Check: Perform steps under "Install Diagnostics", page 7, to test for L1 and L2 line voltage. • If L1 is present, the heater relay is receiving L1 line voltage. • If L2 is present, the heater relay is receiving L2 line voltage, confirming that the centrifugal switch, heater, high limit thermostat, and the thermal cut-off are functional. 1. Unplug dryer or disconnect power. 2. Remove front panel to access thermal components. 3. Using an ohmmeter and referring to the strip circuit or wiring diagram, measure the resistance from the red wire terminal at the thermal cut-off to the red wire terminal at the heater.  If the resistance is about 10 Ω, go to step 5.  If an open circuit is detected, go to step 4. Inlet Thermistor/High Limit Thermostat Assembly Thermal Cut-Off Heater Element Thermal Fuse Outlet Thermistor Electric Dryer Figure 10 - Thermal components, electric dryer, viewed from front. Thermal High Limit Thermostat Cut-Off Flame Sensor Thermal Fuse Outlet Thermistor Gas Dryer Figure 11 - Thermal components, gas dryer, viewed from front. 4. Visually check the wire connections to the thermal cut-off, high limit thermostat, and heater. If the connections look good, check for continuity across each of these components. Refer to strip circuit on page 23.  Replace the heater if it is electrically open.  Replace both the thermal cut-off and high limit thermostat if either the thermal cut-off or the high limit thermostat is electrically open. 5. If no open circuit is detected, remove the P14 connector from the CCU and measure the outlet thermistor resistance between P14-3 and P14-6 at the connector. Refer to "Outlet Thermistor Resistance" table on page 18 for temperatures and their associated values.  If the resistance corresponds to the temperature, the outlet thermistor is good. Go to step 6.  If the thermistor resistance does not agree with the table, replace the outlet thermistor. 6. If the preceding steps did not correct the problem and L1 and L2 were both detected, replace the CCU. If L2 was not detected, suspect the centrifugal switch before replacing the CCU. PAGE 16 DO NOT REMOVE OR DESTROY