Dryer · Bosch · 7 min read

Bosch Dryer Repair Cost — 300, 500 & 800 Series (Heat-Pump) | Northern Virginia

Quick answer

Bosch dryer repair in Northern Virginia typically costs $100–$600 depending on the fault and series. An AutoDry sensor bar set runs $100–$180. An NTC temperature sensor (condensation models) runs $120–$220. A heating element assembly (300/500 Series condensation) runs $180–$320. A thermal fuse runs $80–$150. A control board runs $280–$480. A heat-pump compressor assembly (800 Series) runs $320–$600. Against a $700–$1,600 true replacement cost, most single faults on any Bosch compact dryer are worth repairing.

Bosch compact 24-inch dryers — the 300 Series condensation, 500 Series condensation, and 800 Series heat-pump — are among the most common premium dryers in Northern Virginia laundry closets, paired with Bosch compact washing machines in Arlington condos, McLean townhomes, and Bethesda high-rises renovated between 2015 and 2022. When a Bosch 800 Series heat-pump dryer develops a fault — persistent damp clothes, an error code, or no heat despite clean filters — the first question is whether to repair or replace a compact dryer that costs $700 to $1,600 to replace installed. This guide gives part-by-part repair cost ranges for all three Bosch compact dryer series, explains the Bosch-exclusive components — AutoDry capacitive sensor bars, PerfectDry condenser sensor, heat-pump compressor assembly — that make Bosch dryer service different from a standard dryer repair, and works through the repair-vs-replace math at each price point.

Why Bosch dryer repair costs more than a standard dryer

Bosch 300, 500, and 800 Series compact dryers share three design features that add cost and specificity to service versus a standard vented residential dryer. (1) AutoDry capacitive moisture sensor bars (all models). Every Bosch dryer uses AutoDry — a pair of capacitive sensor bars inside the drum that measure residual moisture in the fabric load by detecting changes in electrical conductance between the bars as laundry tumbles against them. When the cycle detects moisture below target level, the dryer stops — preventing over-drying that damages fibers and over-shrinks cotton. When AutoDry sensor bars develop a mineral scale coating from Northern Virginia's 180–230 ppm hard water, conductance measurement drifts upward, and the dryer reads 'dry' earlier than the load actually is — producing systematically damp laundry with no error code. The fix is OEM Bosch AutoDry sensor bar replacement; aftermarket sensor bars do not reproduce Bosch's capacitance calibration spec, and clothes will continue to under-dry. AutoDry sensor bar scaling is the leading cause of long-cycle and damp-clothes complaints on NVA Bosch dryers that have no mechanical fault — and is 0 nationally documented in non-Bosch-specialist repair guides. AutoDry sensor bar set replacement: $100–$180. (2) Heat-pump compressor assembly (800 Series WTW87NH1UC). Bosch 800 Series heat-pump dryers use a refrigerant-loop drying system — a sealed R-134a compressor circuit that heats incoming air at the condenser and cools and dehumidifies outgoing air at the evaporator, recirculating the same air without venting. When the compressor circuit fails (typically at 8–12 years of age), drying stops completely: the drum runs, the motor runs, but the air never warms. Heat-pump compressor repair requires an EPA 608 certified technician, Bosch OEM refrigerant recovery equipment, and a Bosch-specific compressor assembly — the refrigerant charge, port geometry, and mounting bracket are specific to Bosch's compact platform. Heat-pump compressor assembly replacement: $320–$600. 0 nationally structured cost documentation exists for Bosch 800 Series heat-pump compressor repair at the part-by-part level. (3) PerfectDry hygroscopic condenser sensor (800 Series). Bosch 800 Series heat-pump dryers include a secondary PerfectDry humidity sensor at the condenser outlet — a hygroscopic element that measures air moisture content at the point where dried air exits the heat exchanger. This sensor supplements the AutoDry drum bars to catch residual moisture in loads with very low fabric-to-air contact (single items, loosely packed loads). After 8–10 years in NVA hard-water conditions, the PerfectDry sensor absorbs mineral particulate and produces systematic short-cycling — the dryer stops early on every load regardless of moisture content. OEM Bosch PerfectDry sensor replacement is required; aftermarket humidity sensors for the 800 Series do not exist. PerfectDry sensor replacement: $140–$260. 0 nationally documented.

Bosch dryer repair costs — part by part

These are realistic installed cost ranges — part plus labor — for Northern Virginia Bosch 300, 500, and 800 Series dryer repairs in 2026. Diagnostic fee: $99–$149, credited toward repair. (1) AutoDry sensor bar set — the capacitive moisture sensor bars inside the drum. Replacement required when scale coating causes systematic early-stop (damp laundry) with no error code, or when sensor bars are physically damaged. OEM Bosch AutoDry sensor bar set only. Replacement: $100–$180. (2) NTC temperature sensor — the negative temperature coefficient thermistor measuring air temperature at the heater (condensation models) or at the evaporator inlet/outlet (heat-pump models). NTC failure presents as an E:16 or d:16 error code, systematic overheating, or a dryer that runs without heating. Condensation model NTC replacement: $120–$220. Heat-pump model NTC set (multiple sensors): $140–$260. (3) Thermal fuse — the one-time safety fuse protecting the heating circuit on condensation models (300 and 500 Series). A thermal fuse trips permanently when the dryer overheats — typically due to a severely blocked heat exchanger that was not serviced. Once tripped, the fuse must be replaced and the root cause (heat exchanger blockage) addressed. Thermal fuse replacement: $80–$150. (4) Heating element assembly (condensation models, 300 and 500 Series) — the resistive heating coil that warms drum air on condensation dryers. Heating element failure presents as a dryer that runs through its complete cycle with cold air — lint filter and heat exchanger are clean, but no heat is produced. Heating element assembly replacement: $180–$320. (5) Drive belt — the rubber belt driving drum rotation. Belt failure produces a dryer that powers on and produces heat but whose drum does not spin — laundry sits stationary and comes out hot but wet and tangled. Drive belt replacement: $80–$150. (6) Blower fan motor assembly — the motor driving the blower that circulates air through the heat exchanger on condensation models, or through the evaporator/condenser on heat-pump models. Blower motor failure produces reduced airflow, long cycles, and eventual thermal overload tripping. Blower fan motor assembly replacement: $200–$380. (7) Water container pump (condensation models with drain connection) — the pump that moves condensate from the tub to the drain line on installations plumbed to a household drain rather than using the collection container. Pump failure causes the condensate container to overflow even on plumbed installations, or generates a water-related error code. Condensate pump replacement: $100–$180. (8) Door seal — the rubber gasket sealing the drum opening to the door. Seal degradation allows warm moist air to escape the drum into the laundry closet, reducing drying efficiency and producing condensation on the closet walls. Door seal replacement: $80–$150. (9) Door latch assembly — $80–$140. A failed latch prevents the dryer from starting — the control board does not register the door as closed, and the cycle does not begin. (10) PerfectDry condenser humidity sensor (800 Series) — see above. OEM only. Replacement: $140–$260. (11) Control board — manages all cycle, heat, and program functions. Board failure presents as programs that do not start, a machine that halts mid-cycle, or persistent error codes after all component faults are resolved. Control board replacement: $280–$480. HomeConnect Wi-Fi function (800 Series) requires a HomeConnect-compatible replacement board on WTW87NH1UC and similar HomeConnect-enabled 800 Series models. (12) Heat-pump compressor assembly (800 Series) — see above. EPA 608 certified repair required. Replacement: $320–$600. (13) Heat-pump evaporator fan assembly (800 Series) — the fan circulating air through the heat-pump evaporator coil. Fan failure produces reduced drying efficiency and eventual compressor thermal overload. Evaporator fan replacement: $160–$300.

Bosch 300 vs 500 vs 800 — series differences and service impact

The three Bosch compact dryer series sold in Northern Virginia use different drying technologies and differ in sensor capability and connectivity — differences that directly determine which repair components and costs apply. (1) Bosch 300 Series (representative model: WTA74200US/WTVC4300US, condensation, 24-inch). Standard condensation drying (no heat pump), AutoDry drum sensor bars, basic ExtraClean filter indicator, no HomeConnect. Service profile: heating element, NTC sensor, thermal fuse, AutoDry sensor bars, drive belt, blower motor, door seal, door latch, control board. No heat-pump components apply. True replacement cost for a Bosch 300 Series dryer: $700–$1,000 installed in NVA. (2) Bosch 500 Series (representative model: WTW86NHUC, condensation, 24-inch). Condensation drying, AutoDry, Home Connect Wi-Fi on current production, SteamFinish on some models. Service profile is the same as 300 Series plus HomeConnect-compatible control board requirement on Wi-Fi-enabled models. SteamFinish models include a small steam generator — steam nozzle replacement: $100–$180. True replacement cost: $900–$1,200 installed. (3) Bosch 800 Series (representative model: WTW87NH1UC, heat-pump, 24-inch, EcoSilence, PerfectDry, HomeConnect). Heat-pump drying (R-134a refrigerant loop), PerfectDry hygroscopic condenser sensor, AutoDry drum sensor bars, EcoSilence Drive (ultra-quiet blower), HomeConnect Wi-Fi. Service profile adds heat-pump compressor assembly, PerfectDry sensor, evaporator fan, and multiple NTC sensors versus condensation models. No heating element or thermal fuse applies — heat is generated by the refrigerant loop, not a resistive element. True replacement cost: $1,100–$1,600 installed. (4) Stacked laundry closet installations. Bosch compact dryers are frequently stacked above matching Bosch washers in NVA condo laundry closets (Arlington, Reston, Bethesda, McLean). Access to the dryer front panel (door seal, lint filter, heat exchanger) typically does not require destacking. Access to the dryer rear cabinet (control board, heating element or heat-pump compressor) requires removing the dryer from the stack — 20–35 minutes additional labor per visit. We carry dedicated stack-separation equipment to avoid washer damage during dryer removal. (5) Pre-2018 Bosch 300 Series (older WTVC4300US). Older 300 Series models used a brushed condenser motor rather than the current brushless design; brush set replacement ($60–$120) is an additional service item on high-hour machines. Verify control board part availability on older 300 Series models before authorizing repair.

Bosch dryer repair vs replace — the repair math

The repair case for a Bosch compact dryer is strong on single faults at any age on the 800 Series, and solid on the 300 and 500 Series for all but the oldest units with multiple simultaneous faults. True replacement cost is the correct denominator — unit price plus NVA installation. NVA installation for a compact dryer (disconnect, haul-away, reconnect, vent or condensate connection, test run) runs $150–$300. Stacked installations add $100–$150 for stack separation and reassembly. Bosch 300 Series: $700–$1,000 true installed replacement cost. An AutoDry sensor bar set at $180 is 18–26% of replacement — clearly worth doing. An NTC sensor at $220 is 22–31% — clearly worth doing. A heating element at $320 is 32–46% — worth repairing on any 300 Series under 10 years; borderline on units older than 12 years where other components may also be aging. A control board at $480 is 48–69% — approaching replacement cost on the less expensive 300 Series; on a 300 Series older than 12 years, replacement deserves consideration when a board fault accompanies other aging components. A heating element plus NTC sensor at the same visit ($320 + $220 = $540) is 54–77% — replacement is rational on a 300 Series older than 12 years. Bosch 500 Series: $900–$1,200 true installed replacement cost. A heating element at $320 is 27–36% — clearly worth repairing on any 500 Series. A control board at $480 is 40–53% — repair is correct on any single fault under 10 years. Bosch 800 Series (heat-pump): $1,100–$1,600 true installed replacement cost. An AutoDry sensor bar set at $180 is 11–16% — decisive repair. An NTC sensor at $260 is 16–24% — clearly worth doing. A PerfectDry sensor at $260 is 16–24% — clearly worth doing. A control board at $480 is 30–44% — repair is correct on any single fault. A heat-pump compressor at $600 is 38–55% — this is the one 800 Series repair where age matters: repair is clearly correct on a unit under 10 years, and worth a careful analysis at 12+ years, particularly if the AutoDry sensor bars or PerfectDry sensor are also at end of life. Even at $600 on the most expensive compressor repair, the break-even against a $1,100 minimum replacement is only 55% — the math still favors repair on most 800 Series units that are mechanically sound otherwise. Stacked installation caveat: the additional $100–$150 stacked service premium narrows the repair-vs-replace gap slightly on 300 Series older than 12 years, but has no meaningful impact on the 500 or 800 Series or any single-fault repair under $400.

When to Call a Specialist

Homeowner-accessible Bosch dryer maintenance: clean the lint filter after every load, rinse the heat exchanger (the removable finned panel behind the lower kickplate) every 30–40 cycles, empty the condenser water container as needed, and descale the AutoDry sensor bars with a soft damp cloth quarterly in NVA hard-water households — scale coating is the leading cause of systematic early-stop and damp laundry on Bosch dryers in this region. All other Bosch dryer service — heating element, NTC sensor, thermal fuse, heat-pump compressor assembly, PerfectDry sensor, blower motor, control board, drive belt, door seal — requires a trained technician with Bosch-specific tools, OEM parts, and EPA 608 certification for heat-pump refrigerant work. On stacked laundry closet installations, rear-cabinet access requires removing the dryer from the stack with proper stack-separation equipment. Commonwealth Appliance Repair services Bosch 300, 500, and 800 Series condensation and heat-pump dryers across McLean, Great Falls, Vienna, Arlington, Reston, Falls Church, Alexandria, Fairfax, Bethesda, Chevy Chase, Potomac, Washington DC, and all of Northern Virginia. OEM Bosch heating elements, AutoDry sensor bar sets, and NTC sensors available for same-visit repair on most condensation-model faults. EPA 608 certified heat-pump refrigerant service for 800 Series compressor repairs. Stacked Bosch laundry installations serviced with dedicated stack-separation equipment — no washer damage. Flat-rate diagnostic $99–$149, credited toward repair. Written upfront quote before any work begins. 90-day parts and labor warranty. Call (571) 571-1664.

Call (571) 571-1664 Dryer Repair in NoVA & DC

Frequently Asked Questions

How much does Bosch dryer repair cost in Northern Virginia?

Bosch dryer repair in NVA: AutoDry sensor bars $100–$180, NTC sensor $120–$220, thermal fuse $80–$150, heating element (condensation models) $180–$320, heat-pump compressor (800 Series) $320–$600, control board $280–$480. Diagnostic $99–$149, credited toward repair. Written upfront estimate, 90-day warranty. Call (571) 571-1664.

Is a Bosch 800 Series heat-pump dryer worth repairing?

Yes — for virtually any single fault. A Bosch 800 Series costs $1,100–$1,600 installed to replace. An AutoDry sensor bar set at $180 is 11–16% of replacement. An NTC sensor at $260 is 16–24%. A control board at $480 is 30–44%. Even a heat-pump compressor at $600 is 38–55% — repair is correct on any unit under 10 years. Call (571) 571-1664.

Why does my Bosch dryer stop early and leave clothes damp?

The most common cause in Northern Virginia is mineral scale coating on the AutoDry capacitive sensor bars inside the drum. NVA's 180–230 ppm hard water deposits scale that makes the sensor read 'dry' before the load is — the dryer stops early on every cycle with no error code. AutoDry sensor bar set replacement runs $100–$180. Flat-rate diagnostic credited toward repair. Call (571) 571-1664.

How much does Bosch heat-pump dryer compressor repair cost?

Bosch 800 Series heat-pump compressor repair runs $320–$600 parts and labor — EPA 608 certified refrigerant service required. Against a $1,100–$1,600 installed replacement cost, a compressor repair under 10 years old is clearly worth doing. Written upfront estimate before work begins. 90-day warranty. Call (571) 571-1664.