|
Sensor & Detection Failures
|
|
01
|
False triggering from polished sink decks
|
Faucet
|
Unintended water cycling and wasted consumption
|
High
|
High
|
Reflective stainless steel or mirrored surfaces distorting sensor return
|
|
02
|
False activation from mirror bounce
|
Faucet
|
Erratic operation and user confusion
|
Medium
|
Medium
|
Improper sensor aiming near mirror backsplash
|
|
03
|
Delayed hand detection
|
Faucet
|
Reduced handwashing efficiency and repeated user motion
|
Medium
|
High
|
Weak infrared range or poor calibration
|
|
04
|
Failure to detect small hands
|
Faucet
|
Accessibility issues in schools and daycare facilities
|
High
|
Medium
|
Short sensing window and narrow activation zone
|
|
05
|
Continuous activation loop
|
Faucet
|
Excess water use and user dissatisfaction
|
High
|
Medium
|
Reflection bounce or unstable sensor threshold
|
|
06
|
Ambient light interference
|
Faucet
|
Inconsistent detection under strong sunlight or LEDs
|
Medium
|
Medium
|
Infrared disruption from lighting conditions
|
|
07
|
Sensor lens contamination
|
Both
|
Missed activation and intermittent response
|
Medium
|
High
|
Soap film, water spotting, dust, or cleaner residue
|
|
08
|
Activation zone too close to spout
|
Faucet
|
User must overreach to initiate flow
|
Low
|
Medium
|
Poor factory or field calibration
|
|
09
|
Activation zone too far from discharge point
|
Faucet
|
Water starts before hands are positioned
|
Medium
|
Medium
|
Sensor field exceeds practical washing position
|
|
10
|
Cross-triggering between adjacent fixtures
|
Both
|
Multiple units cycle unnecessarily
|
Medium
|
Low
|
Dense fixture spacing and overlapping sensor fields
|
|
11
|
Dispenser fails to sense hands under nozzle
|
Dispenser
|
No soap delivery and repeated user attempts
|
High
|
Medium
|
Weak proximity response or blocked emitter
|
|
12
|
Dispenser double-dosing per hand pass
|
Dispenser
|
Soap waste and countertop mess
|
Medium
|
Medium
|
Slow reset logic or oversensitive detection
|
|
Power & Electrical Failures
|
|
13
|
Rapid battery depletion
|
Both
|
Frequent downtime in high-traffic restrooms
|
High
|
High
|
High duty cycle and inefficient power management
|
|
14
|
Incorrect transformer sizing
|
Both
|
Unstable performance across multiple fixtures
|
High
|
Medium
|
Underestimated simultaneous demand load
|
|
15
|
Voltage drop on long wire runs
|
Both
|
Intermittent activation and component stress
|
High
|
Medium
|
Undersized conductors or excessive distance
|
|
16
|
AC/DC incompatibility
|
Both
|
Fixture fails to operate or cycles irregularly
|
High
|
Low
|
Incorrect power supply type selected
|
|
17
|
Loose terminal connection
|
Both
|
Random outage and difficult troubleshooting
|
Medium
|
Medium
|
Poor commissioning or vibration over time
|
|
18
|
Water intrusion into control box
|
Both
|
Short circuit risk and system shutdown
|
High
|
Low
|
Improper enclosure sealing or splash exposure
|
|
19
|
Shared power supply overload
|
Both
|
Multiple fixtures fail simultaneously
|
High
|
Medium
|
Too many units connected to one supply
|
|
20
|
Improper grounding
|
Both
|
Electrical instability and safety concern
|
High
|
Low
|
Installation noncompliance
|
|
21
|
Low battery warning absent or ignored
|
Both
|
Unexpected shutdown during service hours
|
Medium
|
High
|
Poor maintenance visibility
|
|
22
|
Connector corrosion
|
Both
|
Intermittent current transfer and early failure
|
Medium
|
Medium
|
Humidity, condensation, or chemical exposure
|
|
23
|
Controller board failure
|
Both
|
Total loss of fixture operation
|
High
|
Low
|
Power surge, moisture, or electronics fatigue
|
|
24
|
Improper polarity wiring
|
Both
|
Non-start or internal electronic damage
|
High
|
Low
|
Installation error
|
|
Water Delivery & Hydraulic Failures
|
|
25
|
Low outlet flow rate beyond user expectation
|
Faucet
|
Poor rinse performance and user dissatisfaction
|
Medium
|
High
|
Overly restrictive aerator or low supply pressure
|
|
26
|
Flow instability during activation cycle
|
Faucet
|
Uneven wash pattern and inconsistent delivery
|
Medium
|
Medium
|
Pressure fluctuation or solenoid irregularity
|
|
27
|
Delayed shut-off
|
Faucet
|
Water waste and splash accumulation
|
High
|
Medium
|
Slow valve response or control lag
|
|
28
|
Premature shut-off during handwashing
|
Faucet
|
User must repeatedly reactivate fixture
|
Medium
|
High
|
Short timeout logic or unstable sensing
|
|
29
|
Solenoid valve sticking open
|
Faucet
|
Continuous flow and water loss
|
High
|
Low
|
Mineral scaling or internal debris
|
|
30
|
Solenoid valve sticking closed
|
Faucet
|
No water delivery
|
High
|
Medium
|
Debris, scale, or coil failure
|
|
31
|
Water hammer at rapid closure
|
Faucet
|
Noise, pipe stress, and system wear
|
Medium
|
Medium
|
Fast shut-off without mitigation
|
|
32
|
Aerator clogging
|
Faucet
|
Reduced stream quality and pressure loss
|
Medium
|
High
|
Sediment or mineral accumulation
|
|
33
|
Spray pattern distortion
|
Faucet
|
Countertop splash and poor hand targeting
|
Medium
|
Medium
|
Worn aerator or partial blockage
|
|
34
|
Crossflow in mixing arrangement
|
Faucet
|
Temperature instability and inconsistent delivery
|
High
|
Low
|
Improper check-valve or mixing setup
|
|
35
|
Hot-water delivery delay
|
Faucet
|
User frustration and short wash cycle
|
Low
|
High
|
Long branch lines or no local recirculation
|
|
36
|
Undersized supply line effect
|
Faucet
|
Starved flow at peak use periods
|
Medium
|
Medium
|
Incorrect plumbing design or retrofit mismatch
|
|
Soap Delivery Failures
|
|
37
|
Soap viscosity incompatibility
|
Dispenser
|
No dispense, weak dose, or pump strain
|
High
|
High
|
Soap thicker than pump design tolerance
|
|
38
|
Foam chamber blockage
|
Dispenser
|
Irregular output and poor lather formation
|
Medium
|
Medium
|
Dried residue or incompatible concentrate
|
|
39
|
Air lock in soap tube
|
Dispenser
|
Pump cycles without product discharge
|
Medium
|
Medium
|
Refill interruption or suction loss
|
|
40
|
Over-dispensing
|
Dispenser
|
Soap waste and sink deck contamination
|
Medium
|
Medium
|
Calibration or timing error
|
|
41
|
Under-dosing
|
Dispenser
|
Insufficient hand hygiene coverage
|
High
|
Medium
|
Low pump output or restricted feed path
|
|
42
|
Drip after dispensing cycle
|
Dispenser
|
Countertop residue and janitorial burden
|
Low
|
High
|
Nozzle retention and valve seal weakness
|
|
43
|
Pump head wear
|
Dispenser
|
Declining dose consistency over time
|
Medium
|
Medium
|
High cycle fatigue
|
|
44
|
Refill cartridge incompatibility
|
Dispenser
|
Operational downtime and service delays
|
Medium
|
Medium
|
Non-matching consumable system
|
|
45
|
Nozzle crusting from dried soap
|
Dispenser
|
Narrowed output and spray misdirection
|
Low
|
High
|
Insufficient periodic cleaning
|
|
46
|
Foam-to-liquid conversion inconsistency
|
Dispenser
|
Unexpected user experience and soap waste
|
Low
|
Low
|
Improper concentrate, dilution, or pump type
|
|
47
|
Suction tube detachment
|
Dispenser
|
Dispenser runs but draws no soap
|
Medium
|
Low
|
Improper maintenance reassembly
|
|
48
|
Soap tank venting problem
|
Dispenser
|
Inconsistent output with intermittent flow
|
Low
|
Low
|
Reservoir pressure imbalance
|
|
Temperature, Mixing & Safety Failures
|
|
49
|
Inconsistent mixed water temperature
|
Faucet
|
User discomfort and complaint frequency
|
Medium
|
High
|
Non-thermostatic blending instability
|
|
50
|
Thermostatic mixer miscalibration
|
Faucet
|
Incorrect discharge temperature
|
High
|
Medium
|
Improper commissioning or drift over time
|
|
51
|
Scald protection failure
|
Faucet
|
Safety risk in public environments
|
High
|
Low
|
Faulty temperature limit mechanism
|
|
52
|
Cold shock due to unstable blending
|
Faucet
|
Negative user experience and complaint
|
Low
|
Medium
|
Pressure imbalance between hot and cold lines
|
|
53
|
Long warm-up cycle causing user abandonment
|
Faucet
|
Shortened wash duration and hygiene reduction
|
Medium
|
High
|
Pipe run distance and no recirculation strategy
|
|
54
|
Mixing valve debris intrusion
|
Faucet
|
Erratic temperature control
|
Medium
|
Medium
|
Insufficient upstream filtration
|
|
Installation & Coordination Failures
|
|
55
|
Incorrect mounting height
|
Both
|
Poor ergonomics and sensor alignment problems
|
Medium
|
Medium
|
Installation deviation from submittal dimensions
|
|
56
|
Improper sink geometry coordination
|
Faucet
|
Splashing and reduced sensing reliability
|
Medium
|
High
|
Spout reach mismatched to basin bowl profile
|
|
57
|
Insufficient backsplash clearance
|
Both
|
Restricted servicing and sensor interference
|
Low
|
Medium
|
Tight countertop layout
|
|
58
|
Improper deck hole spacing
|
Dispenser
|
Difficult fit-up and compromised maintenance access
|
Low
|
Low
|
Counter fabrication mismatch
|
|
59
|
Misaligned sensor relative to user reach zone
|
Both
|
Repeated user waving and poor response
|
Medium
|
High
|
Fixture not centered to basin working area
|
|
60
|
Service box inaccessible after install
|
Both
|
Longer maintenance cycles and increased labor cost
|
Medium
|
Medium
|
Cabinet, wall, or sink enclosure conflicts
|
|
61
|
Incorrect rough-in assumption during retrofit
|
Both
|
Rework, field adaptation, and schedule delay
|
Medium
|
Medium
|
Legacy infrastructure mismatch
|
|
62
|
Drain position conflict with electronics
|
Both
|
Congested under-deck layout and leak exposure
|
Low
|
Low
|
Poor under-lavatory coordination
|
|
63
|
Incorrect sealant selection near sensor lens
|
Both
|
Clouding, residue, or optical interference
|
Low
|
Low
|
Installer material substitution
|
|
64
|
Wall-mounted unit not aligned to sink centerline
|
Faucet
|
Off-axis stream and splashback
|
Medium
|
Low
|
Layout tolerance or install error
|
|
Maintenance & Service Failures
|
|
65
|
Infrequent filter cleaning
|
Faucet
|
Flow loss and valve contamination
|
Medium
|
High
|
Maintenance schedule gap
|
|
66
|
Skipped descaling in hard-water environment
|
Both
|
Accelerated hydraulic and pump deterioration
|
High
|
High
|
Mineral accumulation unmanaged
|
|
67
|
Delayed battery replacement program
|
Both
|
Unexpected outage across multiple fixtures
|
High
|
High
|
Reactive rather than scheduled maintenance
|
|
68
|
Improper reassembly after service
|
Both
|
Leaks, no-start condition, or misdetection
|
Medium
|
Medium
|
Service technician error
|
|
69
|
Incorrect replacement part installed
|
Both
|
Reduced reliability or immediate incompatibility
|
Medium
|
Medium
|
SKU confusion or brand mixing
|
|
70
|
No preventive maintenance log
|
Both
|
Hidden deterioration until failure occurs
|
Medium
|
High
|
Lack of facility asset tracking
|
|
71
|
Soap refill spillage into internal components
|
Dispenser
|
Corrosion and sticky mechanical operation
|
Low
|
Medium
|
Messy refill process
|
|
72
|
Neglected nozzle wiping and cleaning
|
Dispenser
|
Dripping and off-center dispense pattern
|
Low
|
High
|
Service oversight
|
|
73
|
Delayed leak response under deck
|
Both
|
Cabinet damage and electronics exposure
|
High
|
Low
|
Leaks not identified early
|
|
74
|
No standardized reset/troubleshooting procedure
|
Both
|
Extended downtime and unnecessary part swaps
|
Medium
|
Medium
|
Training and documentation gap
|
|
Environment & Material Exposure Failures
|
|
75
|
Hard-water mineral scaling
|
Both
|
Valve drag, flow reduction, and sensor fouling
|
High
|
High
|
High dissolved solids in water supply
|
|
76
|
Humidity-driven corrosion
|
Both
|
Electronic deterioration and connector failure
|
Medium
|
Medium
|
Persistent moisture and limited ventilation
|
|
77
|
Aggressive cleaning chemicals attacking finish
|
Both
|
Finish damage and reduced visual quality
|
Low
|
High
|
Unsuitable custodial chemicals
|
|
78
|
Cleaner overspray onto sensor lens
|
Both
|
Detection instability after janitorial service
|
Low
|
High
|
Residue film on optical surface
|
|
79
|
Freezing or low-temperature exposure in unconditioned spaces
|
Both
|
Cracked components or fluid delivery failure
|
High
|
Low
|
Improper climate control
|
|
80
|
Heat exposure affecting electronics
|
Both
|
Reduced controller life and erratic operation
|
Low
|
Low
|
Mechanical room adjacency or hot enclosure
|
|
81
|
UV/light degradation of exposed plastic parts
|
Dispenser
|
Embrittlement and visual aging
|
Low
|
Low
|
Direct sunlight exposure
|
|
82
|
Galvanic interaction in mixed-metal connection points
|
Faucet
|
Localized corrosion and sealing issues
|
Low
|
Low
|
Dissimilar metals in wet environment
|
|
User Experience, Hygiene & Operational Failures
|
|
83
|
Users wave repeatedly with no activation feedback
|
Both
|
Frustration and perceived fixture unreliability
|
Medium
|
High
|
Unclear activation zone and delayed response
|
|
84
|
Short dispense cycle provides insufficient soap volume
|
Dispenser
|
Reduced handwashing effectiveness
|
High
|
Medium
|
Incorrect dose setting
|
|
85
|
Water splashback onto user clothing
|
Faucet
|
Complaint frequency and poor restroom perception
|
Medium
|
High
|
Stream angle mismatch to basin geometry
|
|
86
|
Soap residue accumulation on countertop
|
Dispenser
|
Unsanitary appearance and extra cleaning labor
|
Medium
|
High
|
Drip, overdosing, or poor nozzle placement
|
|
87
|
Fixture response slower than user expectation
|
Both
|
Perceived product inferiority
|
Low
|
High
|
Sensor, controller, or pump latency
|
|
88
|
Public misuse from unfamiliar sensor behavior
|
Both
|
Repeated activation attempts and queue delays
|
Low
|
Medium
|
No intuitive operation cue
|
|
89
|
Insufficient rinse time due to premature shutoff
|
Faucet
|
Reduced hygiene performance
|
High
|
Medium
|
Short programmed timeout
|
|
90
|
Combo system sequence mismatch
|
Both
|
Soap then water workflow feels inefficient
|
Low
|
Low
|
Fixture choreography not coordinated
|
|
Security, Abuse & Integration Failures
|
|
91
|
Vandalism to exposed nozzles or sensor windows
|
Both
|
Downtime and replacement cost
|
High
|
Medium
|
Public restroom abuse risk
|
|
92
|
Intentional obstruction causing continuous run
|
Faucet
|
Water waste and overflow risk
|
High
|
Low
|
Abuse or tampering
|
|
93
|
Soap theft or reservoir tampering
|
Dispenser
|
Consumable loss and poor hygiene availability
|
Medium
|
Low
|
Unsecured refill access
|
|
94
|
Inconsistent operation between mixed brands
|
Both
|
Nonuniform user experience across restroom
|
Low
|
Medium
|
Different sensing logic and cycle programming
|
|
95
|
Building management integration failure
|
Both
|
Monitoring visibility lost for maintenance teams
|
Low
|
Low
|
Protocol or controller mismatch
|
|
96
|
Incorrect multi-feed soap system balancing
|
Dispenser
|
Uneven soap supply to grouped fixtures
|
Medium
|
Low
|
Line length imbalance or poor commissioning
|
|
97
|
Remote monitoring absent in critical restrooms
|
Both
|
Failures remain unnoticed between rounds
|
Medium
|
Medium
|
No visibility into low-consumable or low-power events
|
|
98
|
Firmware/settings inconsistency across same fixture fleet
|
Both
|
Uneven cycle timing and maintenance confusion
|
Low
|
Low
|
Non-standardized setup during phased installation
|
|
99
|
Commissioning skipped after replacement parts installed
|
Both
|
Recurring faults continue after service
|
Medium
|
Medium
|
No final calibration and verification sequence
|
|
100
|
Asset records do not match installed fixture configuration
|
Both
|
Slow diagnosis, wrong parts ordering, longer downtime
|
Medium
|
Medium
|
Poor documentation and lifecycle tracking
|