Paid diagnostic · Estimate after inspection
K
KONGRA
San Jose & Bay Area

Independent Appliance, Commercial Equipment & Refrigeration Diagnostics

KONGRA LLC provides diagnostic-first support for residential appliances, commercial foodservice equipment, refrigeration systems, HVAC diagnostics, property work orders and selected light production / automation issues within legal and practical service scope.

San Jose & Bay Area · Paid diagnostic · Estimate after inspection · Independent service

Call NowRequest ServiceBook OnlineWhatsApp

Secure scheduling via Square. KONGRA does not request passwords, login credentials, bank login information, private keys, or sensitive account-access information.

  • Paid Diagnostic
  • Estimate After Inspection
  • Independent Service
  • W9 & COI on Request
  • Secure Scheduling via Square
  • San Jose & Bay Area
Engineering-level
Diagnostics
Commercial & luxury
Equipment
W9 & COI
On request
Luxury kitchen with integrated built-in refrigerator, wine column and premium range
On-site
Diagnostic with service data
Five Directions
Luxury residential kitchen with integrated Sub-Zero built-in refrigerator, Wolf range and Miele coffee system
Direction 01 · Residential
01Direction

Residential High-End Systems

Luxury homes · High-end appliances · Built-in systems

Engineering-level diagnostics and repair for luxury residential appliances, integrated built-in refrigeration, wine columns, premium ranges and coffee systems across San Jose and the Bay Area.

Independent service. KONGRA LLC is not affiliated with, endorsed by, or authorized by these manufacturers. Brand names are used only to identify equipment we service.
Brands / systems
  • Sub-Zero
  • Wolf
  • Miele
  • Thermador
  • Viking
  • Gaggenau
  • Fisher & Paykel
  • Bosch Benchmark
  • GE Monogram
  • JennAir
  • Dacor
  • Liebherr
  • True Residential
  • La Cornue
  • Hestan
  • BlueStar
  • AGA
  • Café
  • Bertazzoni
  • Lacanche
  • Officine Gullo
  • Bora
Common problem scenarios
  • Built-in refrigerator not cooling
  • Freezer temperature alarm
  • Wine cooler not holding temperature
  • Ice maker not producing ice
  • Wolf oven not heating evenly
  • Range ignition keeps clicking
  • Miele coffee machine milk system issue
  • Dishwasher not draining
  • Error code after power cycle
  • Water leak under built-in appliance
Book OnlineLearn more · High-end appliance repair WhatsApp
Premium commercial kitchen hot line with combi ovens, gas ranges and salamander broilers
Direction 02 · Commercial Foodservice
02Direction

Commercial Foodservice & Commercial Equipment

Restaurants · Hotels · Commissaries · Commercial kitchens

Front-of-house to back-of-house — cooking, refrigeration, warewashing, prep, bakery and dough equipment. Diagnosed with proper instruments and confirmed against manufacturer service data.

Independent service. KONGRA LLC is not affiliated with, endorsed by, or authorized by these manufacturers. Brand names are used only to identify equipment we service.
Brands / systems
  • Rational
  • Blodgett
  • Vulcan
  • Garland
  • Southbend
  • Wolf Commercial
  • Imperial
  • Jade
  • Middleby Marshall
  • Lincoln
  • TurboChef
  • Merrychef
  • Alto-Shaam
  • Henny Penny
  • Pitco
  • Frymaster
  • Groen
  • Cleveland
  • Market Forge
  • Hobart
  • Univex
  • Globe
  • Robot Coupe
  • Berkel
  • Biro
  • Doyon
  • Baxter
  • Revent
  • Rondo
  • Somerset
  • CMA
  • Champion
  • Jackson
  • Meiko
  • Moyer Diebel
Common problem scenarios
  • Combi oven fault code
  • Commercial range ignition issue
  • Fryer temperature not stable
  • Griddle not heating evenly
  • Conveyor oven not moving
  • Commercial dishwasher not draining
  • Booster heater not heating
  • Glasswasher chemical feed issue
  • Spiral mixer trips breaker
  • Dough sheeter roller issue
  • Slicer motor not starting
  • Food processor safety interlock fault
Book OnlineLearn more · Commercial kitchen equipment WhatsApp
Premium commercial refrigeration and HVAC diagnostic environment with cool-blue lighting
Direction 03 · Refrigeration & HVAC
03Direction

Refrigeration & HVAC Systems

Cold chain · Comfort systems · Mechanical diagnostics

Commercial refrigeration and HVAC diagnostics — walk-ins, reach-ins, ice machines, condensers, heat pumps, rooftop units, controls. Refrigerant work performed only within KONGRA's legal license scope.

Independent service. KONGRA LLC is not affiliated with, endorsed by, or authorized by these manufacturers. Brand names are used only to identify equipment we service.
Brands / systems
  • True
  • Traulsen
  • Hoshizaki
  • Scotsman
  • Manitowoc
  • Beverage-Air
  • Turbo Air
  • Kolpak
  • Norlake
  • Delfield
  • Randell
  • Perlick
  • Hussmann
  • Hillphoenix
  • Copeland
  • Danfoss
  • Carrier
  • Trane
  • Lennox
  • Daikin
  • Mitsubishi Electric
  • Fujitsu
  • LG
  • York
  • Rheem
  • Ruud
  • Goodman
  • Amana
  • Honeywell / Resideo
  • Belimo
  • Ecobee
  • Nest
Common problem scenarios
  • Walk-in cooler temperature alarm
  • Walk-in freezer icing up
  • Reach-in refrigerator not cooling
  • Prep table temperature too high
  • Ice machine low production
  • Compressor not starting
  • Evaporator fan issue
  • Condenser fan issue
  • AC not cooling
  • Heat pump not switching modes
  • Rooftop unit short cycling
  • Thermostat or control issue
  • Contactor / capacitor diagnostics
Book OnlineLearn more · HVAC / Refrigeration diagnostics WhatsApp
Direction 04 · Property / Facilities

Property, Facilities & Portfolio Vendor

Multi-unit · Portfolio vendor · Hotels · Facilities

KONGRA operates as a documented, insured vendor for property managers, multi-unit portfolios, apartment communities, hotels, boutique hotels, estate managers, commercial landlords, restaurant operators, commissary operators and facility managers across the Bay Area.

Segments
  • Property managers
  • Multi-unit portfolios
  • Apartment communities
  • Hotels
  • Boutique hotels
  • Estate managers
  • Commercial landlords
  • Restaurant operators
  • Commissary operators
  • Facility managers
Common problem scenarios
  • Tenant reports refrigerator not cooling
  • Luxury range issue before move-in
  • Hotel ice machine low production
  • Apartment HVAC not cooling
  • Commercial tenant walk-in cooler alarm
  • Restaurant dishwasher down during service
  • Property manager needs written estimate
  • Owner approval required before repair
  • W9 / COI requested for vendor onboarding
  • Recurring work order coordination
  • Work orders
  • Tenant coordination
  • Written estimates before repair
  • Photo documentation when appropriate
  • Invoices
  • W9 and COI available upon request
Book OnlineLearn more · Property management vendor WhatsApp
Luxury multi-unit apartment building at twilight — property portfolio maintenance
Portfolio-friendly

One reliable vendor for your portfolio

Predictable process, documentation and written estimates. Open a work order online or reach us directly.

Book OnlineCall Now WhatsApp
Vendor overview Work order process Hotel maintenance
Direction 05 · Light Production Diagnostics

Light Production Equipment Diagnostics & Troubleshooting Support

CNC · Conveyors · Packaging · Sensors · Drives · Selected Automation Issues

Diagnostic-first troubleshooting support for selected light production equipment, conveyors, packaging systems, sensors, drives, control-related faults and machinery issues within KONGRA’s legal and practical service scope.

Subcategories
  • CNC / Machine Tool Troubleshooting
  • Conveyors & Material Handling
  • Packaging / Sealing Equipment
  • Sensors / Vision / Drives
  • Motors / Pneumatics
  • Selected Robotics / Cobots Support
  • Control-Related Fault Isolation
  • Light Production Equipment
Independent service. KONGRA LLC is not affiliated with, endorsed by, or authorized by these manufacturers. Brand names are used only to identify equipment we service.
Brands / systems
  • Haas
  • Mazak
  • Okuma
  • DMG MORI
  • Doosan / DN Solutions
  • Hurco
  • Fadal
  • Bridgeport
  • FANUC CNC
  • Siemens SINUMERIK
  • Heidenhain
  • FANUC
  • ABB
  • Universal Robots
  • KUKA
  • Yaskawa Motoman
  • Kawasaki
  • Epson
  • Denso
  • Staubli
  • Omron
  • Allen-Bradley / Rockwell
  • Siemens
  • Schneider Electric
  • Mitsubishi Electric
  • Eaton
  • AutomationDirect
  • Yaskawa
  • Danfoss
  • Keyence
  • Cognex
  • Banner
  • SICK
  • Datalogic
  • Dorner
  • Hytrol
  • Interroll
  • FlexLink
  • mk North America
  • Dematic
  • Daifuku
  • TGW
  • Multivac
  • Ishida
  • Lantech
  • Wexxar
  • Markem-Imaje
  • Videojet
  • Domino
  • Heat and Control
  • SEW-Eurodrive
  • Nord
  • WEG
  • Baldor
  • Festo
  • SMC
  • Parker
Common problem scenarios
  • CNC machine servo alarm
  • Spindle or tool changer issue
  • Axis not homing
  • Coolant pump issue
  • Conveyor stops intermittently
  • Belt tracking issue
  • Packaging sealer not heating
  • Labeler misfeed
  • Robot/cobot safety interlock fault
  • Gripper or end-effector issue
  • PLC input not triggering output
  • VFD overcurrent trip
  • Sensor not reading
  • Machine vision camera not detecting product
  • Pneumatic actuator not cycling
  • Motor overload or gearbox noise

KONGRA provides diagnostics, troubleshooting and repair support only within its legal license, insurance and practical service scope. KONGRA is not an authorized OEM, robotics integrator or industrial controls contractor unless explicitly stated. Robotics, automation, CNC, PLC, electrical and regulated industrial work may require OEM support, a certified integrator or properly licensed specialist.

Book OnlineDiscuss a project WhatsApp
Clean light production equipment diagnostic scene with conveyor, control cabinet, sensors and automation components
Direction 05
Coverage matrix

Brands, systems & segments across the five directions

Independent service. Manufacturer names describe equipment serviced only.

Independent service. KONGRA LLC is not affiliated with, endorsed by, or authorized by these manufacturers. Brand names are used only to identify equipment we service.

Residential Luxury Brands

  • Sub-Zero
  • Wolf
  • Miele
  • Thermador
  • Viking
  • Gaggenau
  • Fisher & Paykel
  • Bosch Benchmark
  • GE Monogram
  • JennAir
  • Dacor
  • Liebherr
  • True Residential
  • La Cornue
  • Hestan
  • BlueStar
  • AGA
  • Café
  • Bertazzoni
  • Lacanche
  • Officine Gullo
  • Bora

Commercial Foodservice Brands

  • Rational
  • Blodgett
  • Vulcan
  • Garland
  • Southbend
  • Wolf Commercial
  • Imperial
  • Jade
  • Middleby Marshall
  • Lincoln
  • TurboChef
  • Merrychef
  • Alto-Shaam
  • Henny Penny
  • Pitco
  • Frymaster
  • Groen
  • Cleveland
  • Market Forge
  • Hobart
  • Univex
  • Globe
  • Robot Coupe
  • Berkel
  • Biro
  • Doyon
  • Baxter
  • Revent
  • Rondo
  • Somerset
  • CMA
  • Champion
  • Jackson
  • Meiko
  • Moyer Diebel

Refrigeration & HVAC Brands

  • True
  • Traulsen
  • Hoshizaki
  • Scotsman
  • Manitowoc
  • Beverage-Air
  • Turbo Air
  • Kolpak
  • Norlake
  • Delfield
  • Randell
  • Perlick
  • Hussmann
  • Hillphoenix
  • Copeland
  • Danfoss
  • Carrier
  • Trane
  • Lennox
  • Daikin
  • Mitsubishi Electric
  • Fujitsu
  • LG
  • York
  • Rheem
  • Ruud
  • Goodman
  • Amana
  • Honeywell / Resideo
  • Belimo
  • Ecobee
  • Nest

Property / Facilities Segments

  • Property managers
  • Multi-unit portfolios
  • Apartment communities
  • Hotels
  • Boutique hotels
  • Estate managers
  • Commercial landlords
  • Restaurant operators
  • Commissary operators
  • Facility managers

Machinery & Automation Systems

  • Haas
  • Mazak
  • Okuma
  • DMG MORI
  • Doosan / DN Solutions
  • Hurco
  • Fadal
  • Bridgeport
  • FANUC CNC
  • Siemens SINUMERIK
  • Heidenhain
  • FANUC
  • ABB
  • Universal Robots
  • KUKA
  • Yaskawa Motoman
  • Kawasaki
  • Epson
  • Denso
  • Staubli
  • Omron
  • Allen-Bradley / Rockwell
  • Siemens
  • Schneider Electric
  • Mitsubishi Electric
  • Eaton
  • AutomationDirect
  • Yaskawa
  • Danfoss
  • Keyence
  • Cognex
  • Banner
  • SICK
  • Datalogic
  • Dorner
  • Hytrol
  • Interroll
  • FlexLink
  • mk North America
  • Dematic
  • Daifuku
  • TGW
  • Multivac
  • Ishida
  • Lantech
  • Wexxar
  • Markem-Imaje
  • Videojet
  • Domino
  • Heat and Control
  • SEW-Eurodrive
  • Nord
  • WEG
  • Baldor
  • Festo
  • SMC
  • Parker

KONGRA LLC is an independent service company. Manufacturer names are used only to describe equipment serviced. KONGRA is not affiliated with or endorsed by these manufacturers unless explicitly stated.

Examples

Example diagnostic scenarios

Typical diagnostic situations grouped by direction. Final diagnosis and repair scope are confirmed only after inspection.

Residential

  • Built-in refrigerator not cooling
  • Freezer temperature alarm
  • Wine cooler not holding temperature
  • Ice maker not producing ice
  • Wolf oven not heating evenly
  • Range ignition keeps clicking

Commercial Foodservice

  • Combi oven fault code
  • Commercial range ignition issue
  • Fryer temperature not stable
  • Griddle not heating evenly
  • Conveyor oven not moving
  • Commercial dishwasher not draining

Refrigeration & HVAC

  • Walk-in cooler temperature alarm
  • Walk-in freezer icing up
  • Reach-in refrigerator not cooling
  • Prep table temperature too high
  • Ice machine low production
  • Compressor not starting

Property / Facilities

  • Tenant reports refrigerator not cooling
  • Luxury range issue before move-in
  • Hotel ice machine low production
  • Apartment HVAC not cooling
  • Commercial tenant walk-in cooler alarm
  • Restaurant dishwasher down during service

Machinery & Automation

  • CNC machine servo alarm
  • Spindle or tool changer issue
  • Axis not homing
  • Coolant pump issue
  • Conveyor stops intermittently
  • Belt tracking issue

Examples only — not completed repair claims.

Why KONGRA

Diagnostic-first repair, not parts guessing.

Most repair calls fail when symptoms are treated instead of the system. KONGRA focuses on measurement, diagnostics and confirmed repair scope — so parts are replaced based on evidence, not guesswork.

  • Diagnose properly before replacing parts
  • Repair scope confirmed after inspection
  • Instruments and service data on every visit
  • Written estimate before any repair begins
  1. 01
    Symptom

    What the equipment is actually doing — reported and observed.

  2. 02
    System

    Which subsystem, circuit or loop the symptom belongs to.

  3. 03
    Measurement

    Instrument readings — electrical, pressure, temperature, error data.

  4. 04
    Diagnosis

    Root cause confirmed against measurement, not assumed.

  5. 05
    Repair scope

    Written estimate. Parts ordered against a confirmed fault.

Process

How it works

  1. 01
    Step 01
    Book Online

    Schedule service online in a few clicks.

  2. 02
    Step 02
    Paid Diagnostic

    On-site inspection with proper instruments and service data.

  3. 03
    Step 03
    Estimate / Quote

    Clear repair options based on the actual issue.

  4. 04
    Step 04
    Parts Deposit if Needed

    Special-order commercial or high-end parts may require a deposit.

  5. 05
    Step 05
    Repair

    Repair is performed according to the confirmed scope.

  6. 06
    Step 06
    Invoice & Warranty

    Pay on completion. Repair-specific warranty in writing.

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FAQ

Frequently asked questions

Is the diagnostic visit paid?+

Yes. Diagnostic is a paid on-site visit that includes inspection with proper instruments and service data.

Do you provide estimates before repair?+

Yes. After diagnostic you receive a clear estimate or quote before any repair begins.

Do you work on high-end appliances?+

Yes. Sub-Zero, Wolf, Miele, Thermador, Viking, Gaggenau, Fisher & Paykel, Bosch, GE Monogram, JennAir, Dacor and similar.

Do you work with property managers?+

Yes. Work orders, tenant coordination, photo documentation when appropriate, written estimates, invoices, W9 and COI available on request.

Do you service restaurants and commercial kitchens?+

Yes. Commercial cooking, refrigeration, warewashing, prep and light production equipment.

Do you diagnose commercial refrigeration?+

Yes. Walk-ins, reach-ins, prep tables, ice machines, evaporators and condensers.

Do you work on bakery and dough equipment?+

Yes. Planetary and spiral mixers, sheeters, proofers, rack ovens and related equipment.

Do special-order parts require a deposit?+

Special-order commercial and high-end parts may require a deposit before ordering.

Do you provide invoices, W9 or COI?+

Yes. Invoices are provided on completion. W9 and COI are available on request.

Are you affiliated with appliance manufacturers?+

No. KONGRA LLC is an independent service company. Manufacturer names are used only to describe equipment serviced.

Ready when you are

Book service, or reach us directly.

San Jose & Bay Area · Residential · Commercial · Property · Automation

Call NowRequest ServiceBook OnlineWhatsApp

Secure scheduling via Square. KONGRA does not request passwords, login credentials, bank login information, private keys, or sensitive account-access information.

High-End Appliances·Commercial Kitchen·Commercial Refrigeration·HVAC / Refrigeration·Property Vendor·Light Production Diagnostics·About KONGRA·Privacy Policy·Service Terms
Anti-phishing

What KONGRA will never ask for

  • Online banking passwords
  • Email passwords
  • Manufacturer account passwords
  • Private keys
  • Credit card account login credentials
  • Unnecessary sensitive account-access information
  • Full payment card numbers through this website

Payments and card information, when applicable, are handled through secure third-party payment providers.

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