Maytag Bravos Dryer Fault Codes

 

 

Maytag Bravos Dryer

Failure
Code
Condition
Check/Repair
PF
Power Failure
“PF” flashes to indicate that a power failure occurred while the dryer was running. Press START to continue the cycle, or press PAUSE/CANCEL to clear the display.
AF

Restricted Airflow Condition

"AF" flashes if a restricted airflow condition exists. Check to make sure the lint screen is clean, the door seal is in place and the vent is not
obstructed.


F-01
Primary Control Failure “F-01” flashes when there is a primary control failure.

“F-01” flashes when there is a primary control failure. Replace the machine control electronics.See Accessing & Removing the Electronic Assemblies.

F-02
Keypad/User Interface Failure
“F-02” flashes when there is a stuck button or user interface mismatch. This fault code will ONLY appear when in the diagnostic test mode.See TEST #6.
F-22 Exhaust Thermistor Open

“F-22” flashes if the thermistor is open. See TEST #4a.

F-23 Exhaust Thermistor Shorted “F-23” flashes if the thermistor has shorted. See TEST #4a.
F-24

Inlet Thermistor Open

“F-24” flashes if the inlet thermistor is open.This fault code will ONLY appear when in thediagnostic test mode. See TEST #4a.

F-25 Inlet Thermistor Shorted "F-25" flashes if the inlet thermistor is shorted.
This fault code will ONLY appear when in thediagnostic test mode. See TEST #4a.
F-26 Motor Drive System Failure “F-26” flashes if there is a motor drive system failure. See TEST #3.
F-28 Moisture Sensor Open “F-28” flashes if the moisture sensor strip is open. This fault code will ONLY
appear when in the diagnostic test mode. See TEST #5.
F-29 Moisture Sensor Shorted “F-29” flashes if the moisture sensor strip has shorted. This fault code will ONLY appear when in the diagnostic test mode. See TEST #5.
F-30 Restricted Airflow Condition F-30 flashes if a restricted airflow condition
exists. This fault code will ONLY appear when in
the diagnostic test mode. Check to make sure the
lint screen is clean, the door seal is in place and the vent is not obstructed.

ACTIVATING THE DIAGNOSTIC TEST MODE
1. Be sure the dryer is in standby mode (plugged in with all indicators off, or with only the Dry indicator on).
2. Select any one button (except Pause/Cancel) and follow the steps below, using the same button (remember the button): Press/hold for 2-5 seconds → Release for 2-5 seconds → Press/hold for 2-5 seconds → Release for 2-5 seconds → Press/hold for 2-5 seconds.
If this test mode has been entered successfully, all indicators on the console are illuminated for 5 seconds with 88
showing in the Estimated Time Remaining two-digit display. DIAGNOSTIC: Unsuccessful Entry If entry into diagnostic mode is unsuccessful, press the Pause/Cancel button twice, then press the Power button.
If indicators come on, try to use a different button than was used to activate the diagnostic test mode. If that button fails to enter the diagnostic mode, something is faulty, and it is not possible to enter the diagnostic mode.

DEACTIVATING THE DIAGNOSTIC TEST MODE
Press the Pause/Cancel button twice to exit diagnostics.

TEST #3
Drive Motor Circuit
This test will check the wiring to the motor and the motor itself. The following items are part of this motor system:
Harness/connection
Thermal fuse
Belt/belt switch
Drive motor
Centrifugal switch
Door switch
Machine control electronics
1. Unplug dryer or disconnect power.
2. Access the machine control electronics and measure the resistance across P8-4 and P9-1. See Accessing & Removing the Electronic Assemblies. If resistance across P8-4 and P9-1 is in the range of 1 to 6 ohms, replace the
machine control electronics. Otherwise, go to step 3.
3. Check the wiring and components in the path between these measurement points by referring to the appropriate wiring diagram and strip circuit in Section 7.
4. Perform TEST #4b. If the thermal fuse is OK, continue with step 5.
5. Check the belt switch and drive motor. Access the belt switch and drive motor by removing the front panel/drum assembly. See Removing the Front Panel/Drum Assembly. Slowly remove the drum belt from the spring-loaded belt switch tension pulley, gently letting the pulley down.
6. Remove the white connector from the drive motor switch.
7.Check for the resistance values of the motor’s Main and Start winding coils. NOTE: Main and Start winding coils must be checked at the motor.MAIN 1.4–2.6 Ω Blue wire in back at pin 4 and bare copper wire on pin 5 of black drive motor switch. START 1.4–2.8 Ω Blue wire in back at pin 4 and bare copper wire on pin 3 of black drive motor switch. If the resistance at the motor is correct, there is an open circuit between the motor and machine control electronics. Check for failed belt switch. If the Start winding resistance is much greater than 4 ohms, replace the motor.
8. Check the belt switch by measuring resistance between the two blue wires, while pushing up the belt switch tension pulley.If the resistance reading goes from infinity to a few ohms as pulley arm closes the switch, belt switch is OK. If not, replace the belt switch. If belt switch is OK and there is still an open circuit, check and repair the wiring
harness.
9. Door switch problems can be uncovered in the Door Switch Diagnostic Test; however, if this was not done, the following can be done without applying power to the dryer. Connect an ohmmeter across P8-3 (neutral, white wire) and P8-4 (door, tan wire). With the door properly closed, the ohmmeter should indicate a closed circuit
(0–2 ohms). If not, replace the door switch assembly.

TEST #4a
Thermistors
EXHAUST THERMISTOR
The machine control electronics monitors the exhaust temperature using the exhaust thermistor, and cycles the heater relay on and off to maintain the desired temperature. Begin with an empty dryer and a clean lint screen.
1. Plug in dryer or reconnect power.
2. Start the Timed Dry cycle.
3. If after 60 seconds, F-22 or F-23 flashes in the display and the dryer shuts off, the thermistor or wire harness is either open or shorted. Unplug dryer or disconnect power. Check wire connections at the machine control electronics and thermistor. If wire connections are OK, check the exhaust thermistor resistance per step 5.
4. If F-22 or F-23 does not flash in the display, the connections to the thermistor are good. Therefore, check the exhaust temperature value at any or all of the temperature levels in question, using the Timed Dry cycle, and the following process: Hold a glass bulb thermometer capable of reading from 90° to 180°F (32° to 82°C)
in the center of the exhaust outlet. The correct exhaust temperatures are as follows:

EXHAUST TEMPERATURES

TEMP
SETTING
HEAT TURNS
OFF*
HEAT TURNS
ON
High
155° ± 5°F
(68°± 3°C)
10–15°F
(6–8°C)
below the
heat turn off
temperature
Medium
140° ± 5°F
(60°± 3°C)
10–15°F
(6–8°C)
below the
heat turn off
temperature
Low
125° ± 5°F
(52°± 3°C)
10–15°F
(6–8°C)
below the
heat turn off
temperature
Extra Low
105° ± 5°F
(41°± 3°C)
10–15°F
(6–8°C)
below the
heat turn off
temperature

The measured overshoot using the glass bulb thermometer in the exhaust outlet can be 30°F (17°C) higher.
5. If the exhaust temperature is not within specified limits, or you have come here from step 3, remove the P4 connector, then measure the resistance between P4-3 (red wire) and P4-6 (red wire) at the connector. If the resistance is OK, check P4-3 and P4-6 to machine ground. If resistance is greater than 0 (zero), replace wiring harness. NOTE: All thermistor resistance measurements must be made while dryer is disconnected from power.
The following table gives temperatures and ranges for the associated thermistor resistance values.

Temp

F C

Res

kΩ

Temp

F C

Res

kΩ

50° (10°)
19.0-22.0
80° (27°)
8.5-10.5
60° (16°)
14.8-16.8
90° (32°)
6.8-8.8
70° (21°)
11.5-13.5
100° (38°)
5.0-7.0

If the thermistor resistance does not agree with table, replace the exhaust thermistor.
If the thermistor resistance checks agree with the measurements in the table, replace the machine control
electronics.


INLET THERMISTOR
The machine control electronics monitors the inlet temperature using an inlet thermistor that is part of the inlet thermistor/high limit thermostat assembly.
1. Activate the diagnostic test mode.
2. If F-24 or F-25 is a displayed error in the diagnostic test mode, the thermistor or wire harness is either open or shorted. Unplug dryer or disconnect power. Check wire connections at the machine control electronics and inlet thermistor. If wire connections are good, remove the wires from the inlet thermistor/high limit thermostat assembly and replace the assembly. Plug in dryer or reconnect power.
3. If F-24 or F-25 is not an error that is displayed in the diagnostic test mode, the connections to the thermistor are good. Therefore, check the thermistor’s resistance value, using the following process: Unplug dryer or disconnect power. Access the heater assembly. Hold a glass bulb thermometer capable of reading from 68° to 176°F (20°
to 80°C) in the heater assembly.Check the resistance of the inlet thermistor.

Temp

F (C)

Res

kΩ

Temp

F (C)

Res

kΩ

66°(20°)
61.2–63.7
131°(55°)
14.6–15.3
77° (25°)
49.0–51.0
140°(60°)
12.1–12.8
86° (30°)
39.5–41.1
149°(65°)
10.2–10.7
95° (35°)
32.0–33.3
158°(70°)
8.5–9.0
104° (45°)
26.1–27.2
167°(75°)
7.2–7.6
113° (50°)
21.4–22.3
176°(80°)
6.1–6.5
122° (55°)
17.6–18.5

The table above shows the resistance values that should be observed for the various temperatures at the heater assembly. If the thermistor resistance does not agree with the measurements in the table, replace the inlet thermistor/ high limit thermostat assembly. If the thermistor resistance agrees with the measurements in the table, replace
the machine control electronics.

TEST #5
Moisture Sensor
NOTE: This test is started with the machine completely assembled. This test is performed when an automatic cycle
stops too soon, or runs much longer than expected. NOTE: Dryer will shut down automatically after 2-1/2 hours.
The following items are part of this system:
Harness/connection
Metal sensor strips
Machine control electronics
1. Activate the diagnostic test mode and advance past saved fault codes.
2. Open the dryer door. If a continuous beep tone is heard and an alphanumeric number is displayed on the console as soon as the door is opened, a short circuit exists in the moisture sensor system.
If this doesn’t happen, go to step 3. Otherwise, go to step 4.NOTE: Over drying may be caused by a short circuit in the sensor system.
3. Locate the two metal sensor strips on the inside of the dryer. Bridge these strips with a wet cloth or finger.
If a continuous beep tone is heard and a software revision number is displayed on the console, the sensor passes the
test. Go to step 8. If a beep tone is not heard, or a continuous beep tone is heard before bridging the moisture strips, continue with step 4.
4. Accesss the moisture sensor wires. Remove the back panel. Remove the lint screen. Remove the two screws holding the lint screen duct to the top. Remove four screws from bottom of the duct in rear. Remove the duct from the dryer to access the moisture sensor. Disconnect the sensor connector.
5. Access the machine control electronics. Remove the connector P13 from the circuit board. Check the main harness connections between the sensor connector and machine control for a short or open circuit.
Replace the main harness if necessary. If harness is OK, continue with step 6.
6.Measure the resistance across the outermost contacts of the sensor connector that includes the two MOVs.If a small resistance is measured, check for debris across moisture strips inside of the drum; clean if debris is present.
If debris is not present, replace sensor harness with MOVs. If a small resistance is not measured,
continue with step 7.
7. Measure the resistance across each of the outermost contacts and the center terminal (ground connection).If a resistance less than infinity is measured, replace the sensor harness with MOVs.
8. If moisture sensor diagnostic test passes, check the thermistor: Perform TEST #4a. If the problem persists after replacing the moisture sensor, harness with MOVs and thermistor, replace the machine control electronics.

TEST #6
Buttons and Indicators
This test is performed when any of the following situations occurs during the Console Buttons and Indicators Diagnostic Test: None of the indicators light up, No beep sound is heard, Some buttons do not light indicators.

None of the indicators light up:
1. See Diagnostic Guide/Before Servicing.
2. Perform TEST #1 to verify supply connections.
3. Perform TEST #2.
4. Perform steps in Accessing & Removing the Electronic Assemblies, and visually
check that the P5 connector is inserted all the way into the machine control electronics.
5. Visually check the user interface assembly connections.
6. If both visual checks pass, replace the user interface assembly.
7. Plug in dryer or reconnect power.
8. Perform the Console Buttons and Indicators Diagnostic test to verify repair.
9. If indicators still do not light, the machine control electronics has failed: Unplug dryer or disconnect power.
Replace the machine control electronics. Plug in dryer or reconnect power. Perform the Console Buttons and Indicators Diagnostic test to verify repair.

No beep sound is heard:
1. Perform steps in Accessing & Removing the Electronic Assemblies, and visually check that the P5 connector is inserted all the way into the machine control electronics. If visual check passes, replace the user interface assembly.
2. Plug in dryer or reconnect power.
3. Perform the Console Buttons and Indicators Diagnostic test to verify repair.
4. If replacing the user interface assembly failed: Unplug dryer or disconnect power. Replace the machine control electronics. Plug in dryer or reconnect power. Perform the Console Buttons and Indicators Diagnostic test to verify repair.

Some buttons do not light indicators:
1. Perform steps in Accessing & Removing the Electronic Assemblies, and visually check the user interface assembly connections. If visual check passes, replace the user interface assembly.
2. Plug in dryer or reconnect power.
3. Perform the Console Buttons and Indicators Diagnostics test to verify repair.