Front-load washer and dryer pair in a home laundry room
8 components covered

Field manual · Dryer

LG DLEX3700 / DLGX3701 steam dryer (7.4 cu ft, W / V): quick sheet

Covers: DLEX3700W (white) and DLEX3700V (graphite steel) electric dryers and gas twins DLGX3701W / DLGX3701V, 27-inch 7.4 cu ft vented steam dryers. ENERGY STAR lists DLEX3700* and DLGX3701* from February 2018. LG's spec sheet names WM3700H*A as the matching washer (not WM3600).

Cross-checkedBrands: LG8 components

Popular LG steam dryer with Sensor Dry, Steam Fresh / Steam Sanitary cycles, Wrinkle Care, Flow Sense duct-blockage display and Wi-Fi. Steam models need a cold-water hookup to the dryer. Typical calls: d80/d90/d95 venting codes, tE thermistor codes, steam 'Add Water' faults, no heat and roller/idler noise. Deep diagnostics: see the LG dryer field service manual.

Safety first

  • Unplug before opening panels; electric models run on 240 V.
  • Live-voltage checks at the terminal block are caution work.
  • Gas valve, gas piping and burner gas work are blocked: smell gas = leave, shut supply if safe, call the gas utility.
  • Clean a blocked vent before returning the dryer to service.

How it works

A single motor turns the drum by belt and runs the blower. Electric models heat with an element protected by thermostats and a thermal fuse; gas models use an igniter, flame sensor and gas valve (gas side is referral work).

Flow Sense watches exhaust restriction and shows d75/d80/d90/d95 as the vent gets more blocked; LG says d80 means roughly 80% restriction.

Steam cycles draw cold water through a valve and steam generator/nozzle into the drum. No water supply gives 'Add Water' or E5-type codes.

Sensor Dry reads moisture through bars in the drum; thermistors report temperatures (tE1-tE4 codes in LG's dryer list).

Components & tests

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Front-load washer and dryer pair in a home laundry room by Curtis Adams, Pexels License

Diagnostic guides for this appliance

Guide · Dryer

Ventless dryer not drying: cleaning the filters, condenser and heat exchanger

Ventless dryers depend on clean air passages. Lint that gets past the door filter settles on the condenser or heat exchanger and drying time climbs. Clean every filter stage first, then the condenser or exchanger, then check the water path.

8 steps ~40 mineasy
Guide · Dryer

Dryer squeaks, squeals or thumps: drum rollers, idler pulley, glides and rear bearing

Drum noise usually comes from four wear parts: the drum support rollers (thump, squeak), the idler pulley (squeal or whine), the front glides or bearing slides (scraping) and, on some designs, a rear drum bearing (squeal, drum moves front to back). Take the belt off and turn the drum by hand to find which one it is. Replace rollers as a set.

9 steps ~75 minmoderate
Guide · Dryer

Replacing a broken or slipping dryer drum belt

A broken belt leaves the motor spinning with no drum movement. Open the cabinet, put the new belt around the drum with the ribbed side against the drum, then route it through the idler and onto the motor pulley. Inspect the idler and rollers while you are in there.

7 steps ~50 minmoderate

Other dryers manuals

Manual · Dryer

Miele T1 heat-pump dryer (24-inch, ventless): field service manual

Miele T1 compact heat-pump dryers sold in the US (TWI180WP and related T1 WP models). Series names only.

6 components5 common failuresMiele
Manual · Dryer

Bosch 300/500/800 compact 24-inch dryer (condensation and heat pump): field service manual

Bosch 24-inch compact ventless dryers sold in the US: 300 Series condensation (WTG86-series) and 500/800 Series heat-pump (WQB- and WTW-series). Series names only.

7 components5 common failuresBosch
Manual · Dryer

Whirlpool HybridCare heat-pump dryer (27-inch, ventless): field service manual

Whirlpool HybridCare full-size ventless heat-pump dryers (WHD-series, about 2015 onward). Series names only.

6 components5 common failuresWhirlpool
LG DLEX3700 / DLGX3701 steam dryer (7.4 cu ft, W / V): quick sheet · OnCall Tech