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Commercial condensing boiler

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Navien Commercial condensing boiler NFB700-C Series

Navien Water heating products Commercial condensing boiler Repair, maintenance, and replacement planning
Navien NFB700-C Series product image

Technical Specifications

Product Specs

  • Brand: Navien
  • Model or series: NFB700-C Series
  • Equipment type: Commercial condensing boiler
  • Product group: Water heating products
  • condensing boiler equipment
  • combi boiler
  • System role: Hydronic heating equipment for hot-water heating systems
  • Application: Commercial, light-commercial, or managed-building HVAC and water-heating applications
  • Compatibility check: Verify fuel type, venting, electrical requirements, capacity, controls, and installation clearances.
  • Verified source: navieninc.com

Useful troubleshooting details

  • Confirm the packaged unit model, serial number, tonnage, voltage, refrigerant or fuel type, control setup, access location, and service history.
  • Share no-heat, no-cooling, weak airflow, alarms, control issues, tenant comfort complaints, condensate, or unusual noise.
  • For planning, include business hours, rooftop or mechanical access notes, tenant impact, replacement timing, and maintenance history.

Troubleshooting

Error Codes

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E001 Equipment control

Heat exchanger overheat

Record the Navien code, avoid repeated reset attempts, and schedule GreenFlow service.
E003 Combustion / venting

Ignition failure

Record the Navien code, avoid repeated reset attempts, and schedule GreenFlow service.
E004 Combustion / venting

False flame detection

Record the Navien code, avoid repeated reset attempts, and schedule GreenFlow service.
E012 Combustion / venting

Flame loss

Record the Navien code, avoid repeated reset attempts, and schedule GreenFlow service.
E016 Equipment control

Heat exchanger overheat

Record the Navien code, avoid repeated reset attempts, and schedule GreenFlow service.
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Service planning

How GreenFlow handles NFB700-C Series requests

1

Identify the equipment

Confirm the model or series name, serial number if available, photos, and whether the unit is roof, exterior, basement, or mechanical-room equipment.

2

Describe the service issue

Share no heat, no cooling, weak airflow, error codes, alarms, leaks, noise, control problems, or comfort complaints.

3

Review access and history

Include access notes, tenant or business-hour constraints, filter status, recent repairs, and maintenance records when available.

4

Plan the next step

GreenFlow can route the request for diagnostics, repair planning, maintenance, replacement scope, or related system upgrades.

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Our Happy Customers

Ray

Just had a service call because my tankless water heater stopped working with E110 code. Andrey located the root cause real quick and fixed the issue within half an hour, also gave reasonable recommendations for further maintenance.

Jack B.

Andrey always does a great job.

Michele Z.

Andrey was professional, prompt, smart, thorough and exceedingly pleasant. We are likely switching our current HVAC company to Green Flow.

Melissa S.

The repair person came quickly and was super efficient and polite, and showed me what to do next time. He gave my dog a quick pay and was off again.

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