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Bosch · SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry

Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry E4 Error Fix: Water Flow Switch Defective

The water flow switch (flow meter) is defective. This sensor monitors water flow into the dishwasher to confirm adequate fill. Check the wire harness connections to the flow switch. Test the flow switch for proper operation and replace if defective. Also check for blockages in the water inlet path that could prevent the switch from detecting flow. The flow switch is typically located near the water inlet valve.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error E4 on the Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry means: Water Flow Switch Defective. The top-ranked community fix is “Test and Replace Defective Water Flow Switch” (medium difficulty, ~40 min, DIY cost: $20-$30). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · dishwasher

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many dishwasher repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $130-$190.

Other Bosch Models with Error E4

B09IB81NSP 24 in 800 Series Glass Door Bottom Freezer

refrigerator · 2 fixes

B11CB81SSS 24 in 800 Series Counter Depth Bottom Freezer

refrigerator · 2 fixes

B21CL81SNS 36 in 800 Series Counter Depth 4-Door French Door

refrigerator · 2 fixes

B30IR900SP 30 in Benchmark Built-In All Refrigerator

refrigerator · 2 fixes

B36CL80SNS 36 in 800 Series French Door with VitaFreshPro

refrigerator · 2 fixes

B36CT80SNS 36 in 800 Series French Door Counter Depth

refrigerator · 2 fixes

B36FD50SNS 36 in 500 Series French Door with Quick IcePro

refrigerator · 2 fixes

B36IT80SNS 36 in Benchmark Built-In French Door

refrigerator · 2 fixes

HMB50152UC 500 Series 30 in Built-In Microwave

microwave · 2 fixes

HMC80152UC 800 Series 30 in Convection Speed Microwave

microwave · 2 fixes

HMC80252UC 800 Series 30 in Speed Microwave Oven

microwave · 2 fixes

HMD8451UC 800 Series 24 in Drawer Microwave

microwave · 2 fixes

HMV3053U 300 Series 30 in Over-the-Range Microwave

microwave · 1 fix

HMV5053U 500 Series 30 in Over-the-Range Microwave

microwave · 2 fixes

SHE3AR75UC 24 in 100 Series Front Control 50 dBA

dishwasher · 2 fixes

SHE53C85N 24 in 300 Series Front Control 46 dBA

dishwasher · 2 fixes

SHP65CM5N 24 in 500 Series Pocket Handle 44 dBA

dishwasher · 2 fixes

SHP65TL5UC 24 in 500 Series Bar Handle 44 dBA with AutoAir

dishwasher · 2 fixes

SHP878ZD5N 24 in 800 Series Pocket Handle 42 dBA

dishwasher · 2 fixes

SHPM78Z55N 24 in 500 Series Top Control 44 dBA

dishwasher · 2 fixes

SHPM88Z75N 800 Series Dishwasher

dishwasher · 2 fixes

SHS53CD5N 24 in 300 Series Scoop Handle 46 dBA

dishwasher · 2 fixes

SHS863WD5N 24 in 300 Series Top Control 46 dBA

dishwasher · 2 fixes

SHV68TL3UC 24 in 800 Series Panel Ready 42 dBA

dishwasher · 2 fixes

SPE68B55UC 18 in 800 Series ADA Compact 44 dBA

dishwasher · 2 fixes

Other Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry Error Codes

No Fault Codes Recorded

2 fixes

Heating Problem

2 fixes

E12

Calcification / Scale Buildup

2 fixes

E13

Water Heating Timeout

2 fixes

E14

Flow Meter / Water Sensor Error

2 fixes

E15

Water in Base Pan — AquaStop Activated

2 fixes

E16

Unauthorized Water Fill Detected

2 fixes

E17

Over-Fill Level Exceeded

2 fixes

People Also Ask About Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry Error E4

What does error code E4 mean on a Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry?

Error code E4 on the Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry means: Water Flow Switch Defective. The water flow switch (flow meter) is defective. This sensor monitors water flow into the dishwasher to confirm adequate fill. Check the wire harness connections to the flow switch. Test the flow switch for proper operation and replace if defective. Also check for blockages in the water inlet path that could prevent the switch from detecting flow. The flow switch is typically located near the water inlet valve.

How do I fix error code E4 on my Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry?

The most successful fix is "Test and Replace Defective Water Flow Switch" (medium difficulty, ~40 minutes). Estimated DIY cost: $20-$30. HomeMD has 2 community-ranked fixes for this error.

Is error code E4 on a Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry error E4 myself?

Yes — the top-ranked community fix ("Test and Replace Defective Water Flow Switch") is rated medium difficulty and takes about 40 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Needle-nose pliers.

How much does it cost to repair Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry error E4?

DIY cost: $20-$30. Professional repair typically costs $130-$190. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry have?

The Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry has 8 other known error codes, including: E0 (No Fault Codes Recorded), E1 (Heating Problem), E12 (Calcification / Scale Buildup), E13 (Water Heating Timeout), E14 (Flow Meter / Water Sensor Error), and 3 more.

Which other Bosch models have the E4 error?

Error code E4 also appears on 25 other Bosch models: B09IB81NSP 24 in 800 Series Glass Door Bottom Freezer, B11CB81SSS 24 in 800 Series Counter Depth Bottom Freezer, B21CL81SNS 36 in 800 Series Counter Depth 4-Door French Door, B30IR900SP 30 in Benchmark Built-In All Refrigerator, B36CL80SNS 36 in 800 Series French Door with VitaFreshPro, B36CT80SNS 36 in 800 Series French Door Counter Depth, and 19 more. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry have?

The Bosch SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry has 8 other known error codes:

E0 — No Fault Codes Recorded (2 fixes)
E1 — Heating Problem (2 fixes)
E12 — Calcification / Scale Buildup (2 fixes)
E13 — Water Heating Timeout (2 fixes)
E14 — Flow Meter / Water Sensor Error (2 fixes)
E15 — Water in Base Pan — AquaStop Activated (2 fixes)
E16 — Unauthorized Water Fill Detected (2 fixes)
E17 — Over-Fill Level Exceeded (2 fixes)

Which other Bosch models have the E4 error?

Error code E4 also appears on 25 other Bosch models:

B09IB81NSP 24 in 800 Series Glass Door Bottom Freezer (refrigerator) · 2 fixes
B11CB81SSS 24 in 800 Series Counter Depth Bottom Freezer (refrigerator) · 2 fixes
B21CL81SNS 36 in 800 Series Counter Depth 4-Door French Door (refrigerator) · 2 fixes
B30IR900SP 30 in Benchmark Built-In All Refrigerator (refrigerator) · 2 fixes
B36CL80SNS 36 in 800 Series French Door with VitaFreshPro (refrigerator) · 2 fixes
B36CT80SNS 36 in 800 Series French Door Counter Depth (refrigerator) · 2 fixes
B36FD50SNS 36 in 500 Series French Door with Quick IcePro (refrigerator) · 2 fixes
B36IT80SNS 36 in Benchmark Built-In French Door (refrigerator) · 2 fixes
HMB50152UC 500 Series 30 in Built-In Microwave (microwave) · 2 fixes
HMC80152UC 800 Series 30 in Convection Speed Microwave (microwave) · 2 fixes
HMC80252UC 800 Series 30 in Speed Microwave Oven (microwave) · 2 fixes
HMD8451UC 800 Series 24 in Drawer Microwave (microwave) · 2 fixes
HMV3053U 300 Series 30 in Over-the-Range Microwave (microwave) · 1 fix
HMV5053U 500 Series 30 in Over-the-Range Microwave (microwave) · 2 fixes
SHE3AR75UC 24 in 100 Series Front Control 50 dBA (dishwasher) · 2 fixes
SHE53C85N 24 in 300 Series Front Control 46 dBA (dishwasher) · 2 fixes
SHP65CM5N 24 in 500 Series Pocket Handle 44 dBA (dishwasher) · 2 fixes
SHP65TL5UC 24 in 500 Series Bar Handle 44 dBA with AutoAir (dishwasher) · 2 fixes
SHP878ZD5N 24 in 800 Series Pocket Handle 42 dBA (dishwasher) · 2 fixes
SHPM78Z55N 24 in 500 Series Top Control 44 dBA (dishwasher) · 2 fixes
SHPM88Z75N 800 Series Dishwasher (dishwasher) · 2 fixes
SHS53CD5N 24 in 300 Series Scoop Handle 46 dBA (dishwasher) · 2 fixes
SHS863WD5N 24 in 300 Series Top Control 46 dBA (dishwasher) · 2 fixes
SHV68TL3UC 24 in 800 Series Panel Ready 42 dBA (dishwasher) · 2 fixes
SPE68B55UC 18 in 800 Series ADA Compact 44 dBA (dishwasher) · 2 fixes

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