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FIXED Maytag MEDB765FW0 electric dryer won't heat, fault code F4E4

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ccupples

Premium Member
Joined
Jan 19, 2010
Messages
30
Location
Texas
Model Number
MEDB765FW0
Brand
Maytag
Age
1-5 years
4-year old Maytag MEDB765FW0 has stopped heating
Entering service diagnostics reveals fault F4E4 [L2 Line Voltage Error]
Service test produces L2 000 L1 125 Htr 125 Air 001 [Cannot detect airflow]
Voltage at the terminal block reads 124 Vac on each leg and 248 Vac across both legs
Resistance check across heater element terminals yields no continuity

Do I have a bad heater element and is that the likely cause of the L2 line voltage error, or do I need to keep investigating?
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
136,046
Location
Vicksburg Junction, Arizona
F4E4--->L2 Line Voltage Error--->Indicates low L2 voltage (less than 50 V) is detected at the ACU.

Lets check for proper power to the ACU first. Here's your tech. data sheet: https://drive.google.com/file/d/1cLesOLgDjk35OnaQc1NMhGwuLD1evKqu/view?usp=sharing Look on Page 12 where it says TEST #1: ACU Power Check

Since you are getting 240 volts at the wall outlet, next step--->Disconnect Power or Unplug Dryer--->Remove console to access the machine electronics(ACU). Then with a voltmeter set to AC, connect black probe to ACU P8-3 (N) and red probe to P9-2 (L1). (See Figure 2.) Plug in dryer or reconnect power.

You definitely have a bad heating element too if you don't read any continuity on it.

Here's the heating element for your model:
Heating Element Assembly WP3387747


Let us know what you find.

Jake
 

ccupples

Premium Member
Joined
Jan 19, 2010
Messages
30
Location
Texas
Thanks for the response, Jake. The ACU power check passes with 124 Vac between P8-3 & P9-2 and 5.08 Vdc between P2-3 & P2-1.

I've found a local source for a replacement heater element that I'll be picking up and installing later today.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
136,046
Location
Vicksburg Junction, Arizona
Ok then yes, the new heating element should fix it completely then.:)

Jake
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
136,046
Location
Vicksburg Junction, Arizona
Excellent @ccupples glad to hear the new heating element fixed it.(y)

Thanks for the update!

Jake
 
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