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Error code reference

Moffat Dryer Error Code F3

The selected humidity end level was not reached due to error on the humidity sensor or faulty connection between the electronic control and the…

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What the F3 error code actually means

Your Moffat dryer ran for 3 hours without sensing that your clothes reached the dryness level you selected, so it stopped automatically to prevent over-drying or wasting energy. This usually means there is a problem with the moisture sensor inside the drum or a loose wire connecting it to the dryer's control board. The clothes may still be damp, so you will need to address the sensor issue before relying on automatic drying cycles again.

Diagnostic procedure

The full F3 procedure

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1
First diagnostic step
Check humidity sensor and its connection to the electronic control.
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Most common causes of F3

Ranked by how often they cause this code
  1. 1Residue buildup on humidity sensor bars
  2. 2Loose or corroded wiring connection
  3. 3Faulty humidity sensor
  4. 4Damaged wiring harness
  5. 5Faulty electronic control board

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Questions people ask about F3

What does F3 mean on a Moffat dryer?
F3 indicates that the dryer was unable to reach the selected humidity end level during a drying cycle. The appliance automatically stops after 3 hours as a safety measure. The code points to a fault in the humidity sensor or a problem with the wiring connection between the sensor and the electronic control board.
Is it safe to keep using my dryer when F3 is displayed?
The dryer's built-in 3-hour shutoff is designed to prevent continuous unattended operation when the humidity sensor is not functioning correctly. While the safety cutoff reduces certain risks, you should not rely on the automatic drying cycle until the sensor fault is resolved, as the dryer cannot accurately detect when clothes are dry. Continued use with a faulty sensor may result in under-dried loads or extended cycle times.
How much does it cost to repair a Moffat dryer F3 error?
Repair costs depend on the cause. Cleaning the sensor bars costs nothing beyond a small amount of rubbing alcohol. A replacement humidity sensor typically runs in the range of $20 to $60 for the part alone. If the electronic control board is at fault, parts can range from $80 to $200 or more, and professional labor costs will add to the total depending on your location and the technician's rates.
Can I fix a Moffat dryer F3 error myself?
Some causes of the F3 error are DIY-friendly. Cleaning residue off the humidity sensor bars with rubbing alcohol and a soft cloth is a straightforward first step. Checking wiring harness connections for looseness or corrosion is also manageable for someone comfortable working inside appliances. Replacing the sensor or control board requires more technical skill and familiarity with appliance disassembly.
Will resetting the dryer clear the F3 error code?
Resetting the dryer may temporarily clear the F3 code, but the error will return if the underlying humidity sensor fault or wiring issue is not corrected. A reset does not repair a faulty sensor or a bad connection. Address the root cause first before attempting to reset and resume normal operation.

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