Frigidaire Dryer E5B: Moisture Sensor System Failure
Does This Need Immediate Repair?
Try this first: pull the breaker for five minutes. Restore power. Run a timed-dry cycle (not auto-dry, which relies on the moisture sensor). If the dryer heats and tumbles normally on timed dry, the moisture sensor circuit has failed but the dryer remains usable for timed cycles while you arrange repair.
Auto-dry cycles (the ones that stop automatically when clothes are dry) will not work correctly until the moisture sensor system is fixed.
Do You Have the Right Tools?
Gas leak detector ($130), thermal fuse tester ($95), belt tension gauge, and vent inspection camera ($180). Our technician arrives with $15K+ in professional tools — your diagnostic is free.
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How Frigidaire Moisture Sensing Works
Inside the drum, two metal sensor bars are mounted on the lint screen housing. As clothes tumble, they brush across these bars. Wet fabric conducts electricity between the bars; dry fabric does not. The board applies a small voltage across the bars and measures the resulting current. High current equals wet clothes. Low current equals dry.
E5B fires when the board detects the moisture sensor circuit is electrically inconsistent: readings that jump erratically, a permanently open circuit, or a permanently closed circuit that does not change regardless of drum contents.
Common Causes
Fabric softener buildup on sensor bars. Dryer sheets and liquid fabric softener leave a waxy film on the metal bars. Over months, this film insulates the bars from fabric contact. The board reads permanently open (no conductivity) and flags E5B. This is the most common cause and costs nothing to fix.
Corroded sensor bar connections. The bars connect to the wiring through spade terminals behind the lint screen housing. Humidity and lint accumulation corrode these terminals over years, creating high-resistance connections that produce erratic readings.
Broken wire in harness. The wiring from the sensor bars to the board passes through the drum bulkhead and runs along the chassis. Vibration can break a conductor at a stress point.
Board input failure. The analog-to-digital converter channel that reads the moisture sensor can fail from voltage spikes. This is the least common cause.
Safety First — Know the Risks
Gas dryers carry carbon monoxide and explosion risk. Even electric dryers involve 240V circuits that can deliver a fatal shock. Our techs are licensed and insured — let them handle the risk.
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Cleaning the Sensor Bars (Free Fix, Try First)
- Open the dryer door. Locate the two shiny metal strips on the lint screen housing (inside the drum, flanking the lint screen slot).
- Dampen a cloth with rubbing alcohol. Scrub each bar firmly for 30 seconds.
- Dry with a clean cloth. Run an auto-dry cycle with a load of damp towels.
- If E5B clears and the dryer stops when towels are dry, the bars were coated and the fix is complete.
Testing the Sensor Circuit
If cleaning does not resolve E5B:
- Unplug the dryer. Remove the lint screen housing (two screws).
- Disconnect the sensor wire connector behind the housing. Measure resistance across the two sensor bar leads. With nothing touching the bars, resistance should be very high (megohms). Place a damp cloth across both bars simultaneously and resistance should drop to 10K-100K ohms. No change means the bars or their connections have failed.
- If the bars test normal, measure continuity through the wiring harness to the board connector. An open wire confirms a harness break.
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The Real Cost of DIY
Average DIY attempt: $150-400 in tools you may use once, plus the risk of further damage. Our diagnostic visit costs $0 — we find the problem and give you an honest quote.
Licensed & Insured · 90-Day Warranty · Same-Day Service
Parts and Cost
| Component | Parts | Professional Total |
|---|---|---|
| Sensor bar cleaning | $0 | $0-$80 (if tech visit) |
| Sensor bar assembly | $15-$30 | $90-$150 |
| Wiring repair | $5-$10 | $100-$160 |
| Control board | $100-$180 | $180-$300 |
Gallery Model Difference
Gallery dryers with the Perfect Steam system use an enhanced moisture sensing algorithm that cross-references the moisture bars with exhaust temperature rate-of-change. This dual-input approach means Gallery models are more sensitive to sensor drift but also more accurate when sensors are clean. If E5B appears on a Gallery model, cleaning the bars is even more likely to resolve it because the algorithm flags marginal readings earlier.
Don't Void Your Warranty
Opening your appliance yourself may void the manufacturer warranty. Our repair comes with a 90-day guarantee, and we document everything for warranty compliance.
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FAQ
Can I just use timed dry and ignore E5B? Yes, as a temporary workaround. Timed dry cycles do not use the moisture sensor. However, auto-dry cycles offer better energy efficiency and fabric care, so repair is worthwhile.
Does dryer sheet use increase E5B risk? Significantly. Liquid fabric softener applied in the washer and dryer sheets both deposit waxy residue on the sensor bars. If you use both, clean the bars monthly.
E5B appears intermittently. What does that pattern mean? Intermittent E5B often indicates corroded spade terminals behind the lint screen housing. The connection makes and breaks with vibration. Clean the terminals with electrical contact cleaner.
Frigidaire dryer E5B is usually a 10-minute sensor bar cleaning. If that does not resolve it, our technicians diagnose the full circuit. Schedule repair.
