Dishes coming out dirty? We fix spray arms, wash motors, and water temperature issues. Same-day service, 90-day warranty. Average repair cost: $100–$250. Some causes are DIY-fixable — see below.
Dishes coming out dirty in San Jose most commonly stems from the city's moderately hard water at 280 ppm TDS clogging spray arm nozzles with mineral deposits. As calcium and magnesium accumulate inside the tiny spray holes, water jets lose pressure and coverage, leaving dishes in shadow zones where no water reaches. The hot, dry climate means incoming cold water during winter months may be cooler than in mild coastal cities, dropping below the detergent activation threshold of around 120°F and resulting in poor cleaning even when the spray arms function properly. Many tech-worker San Jose households install premium Bosch and Miele dishwashers that rely on precise spray geometry — any mineral clogging of individual nozzles disrupts the carefully engineered coverage pattern more dramatically than in standard-brand units with simpler spray arms.
San Jose's 280 ppm TDS water deposits mineral scale inside spray arm nozzles, progressively reducing jet pressure and coverage. Cold incoming water during winter may not reach the 120°F detergent activation threshold, leaving residue on dishes. Premium Bosch and Miele units common in tech-worker homes rely on precise spray geometry that is more sensitive to nozzle clogging than standard brands. Hot, dry conditions mean mineral deposits harden between cycles.
Clogged spray arms
Failed wash motor
Low water temperature
Broken soap dispenser
Worn circulation pump
Normal wear on internal parts is the leading cause of dishwasher not cleaning dishes issues. Regular use over 5-10 years gradually degrades moving parts and seals.
Cost: $130–$240 | Time: 60-90 minutes
Control board malfunctions, faulty sensors, or wiring issues can cause not cleaning dishes symptoms. Power surges and age-related degradation are typical triggers.
Cost: $156–$280 | Time: 45-75 minutes
Debris, mineral deposits, or foreign objects can restrict normal operation. This is often preventable with regular maintenance.
Cost: $130–$195 | Time: 30-60 minutes
| Detail | Range |
|---|---|
| Diagnostic | Free |
| Typical repair cost | $100–$250 |
| Repair time | 1-1.5 hours |
| Warranty | 90 days parts + labor |
Cost varies by root cause. Exact quote after free diagnostic visit.
Dishwasher cleaning-performance repairs cost $100-$250 in the Bay Area. Spray arm cleaning or replacement runs $80-$150. Wash motor replacement averages $175-$275 installed. Monthly citric acid rinse cycles dissolve spray arm mineral deposits and maintain cleaning performance.
In San Jose, wide day-night temperature swings (30f+ delta) stress thermal expansion joints, thermostat cycling, and sealed-system pressures. This can affect your appliance's water inlet solenoid: cold overnight temperatures contract the solenoid plunger; daytime heat expands it — this cycling eventually causes the valve to stick Insulate cold water supply lines in unconditioned spaces like garages
Free diagnostic visit for not cleaning dishes issues. Same-day appointments available in San Jose.
Book Free DiagnosticReviewed by Robert Aguilar, Field Service Manager & Technical Reviewer