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Maytag dryer MED6630HW0 not heating

I have a Maytag Dryer, MED6630HW0.  Several months ago it stopped heating, otherwise it ran fine.  There are no errors on display.

Circuit breaker appears to work fine (not “tripped” and does turn dryer on/off)

Outlet tests correctly (~120V at both terminals)

Inside the dryer

Heating element and heater box:

Heating element has continuity between the two terminals and no continuity between either terminal and the body (ground).

Thermal cut off and High Limit Thermostat (both on heater box) have continuity between the two terminals and no continuity at either terminal and the heater box (ground) .

Blower housing:

Thermal fuse has continuity between the two terminals and no continuity at either terminal and ground.

Thermistor has about 15k Ohms of resistance and drops very quickly when heated with a hair dryer.

When I put it all back together….it worked fine, until several months later (now).  It is back to running as expected but no heat.  I took everything apart and everything tested as before.

I entered the diagnostic mode; there are no error codes shown and there are no errors stored.

In the encoder test, all keys work as expected.  They turn off as I press each key.

The automatic test cycle appears to run correctly, except there is no heat.  It runs with “Enc” displayed for several minutes, then “but” displayed for several minutes, then turns itself off.

Any ideas why the dryer will not heat? Thanks

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Hi @ldg30065

Not sure whether the encoder has to be stepped 1 more position after Enc is displayed and then after the Enc light is off, press the Extra Power button or not to turn the heater on.

The service mode Test Step #4 on p.6 of the tech sheet instructions are a bit confusing. At least to me anyway.

If there's no voltage detected at the heater relay there should have been an F1 E1 error code - see p.9.

On p.16 it mentions testing the centrifugal switch in the dryer motor. Looking at the schematics and the wiring diagram the heater's power supply comes through the centrifugal switch but if that was faulty it should have failed the diagnostic tests as there should be no voltage at the heater relay. Unless of course the test only proves that the relay operates i.e. current flow through the relay coil, but doesn't test the relay contacts which when operated complete the heater circuit.

There's a heater strip schematic on p.23 and a wiring diagram on p.27 that may help to trace the heater's operating circuit.

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