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Condensing hydronic furnace

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Navien Condensing hydronic furnace NPF Series

Navien HVAC systems, A/C and heat pumps Condensing hydronic furnace Repair, maintenance, and replacement planning
Navien NPF Series product image

Technical Specifications

Product Specs

  • Brand: Navien
  • Model or series: NPF Series
  • Equipment type: Condensing hydronic furnace
  • Product group: HVAC systems, A/C and heat pumps
  • System role: Forced-air heating appliance for a ducted HVAC system
  • Application: Residential or commercial hydronic heating applications when model capacity is appropriate
  • Compatibility check: Match with compatible indoor unit, coil or air handler, controls, refrigerant, voltage, and capacity.
  • Verified source: navieninc.com

Useful troubleshooting details

  • Confirm the furnace or packaged heating model, serial number, gas type, venting or condensate setup, filter size, thermostat, and paired cooling equipment.
  • Share no-heat, ignition trouble, lockout or error codes, pressure-switch concerns, blower issues, short cycling, venting, condensate, or unusual noise.
  • For replacement planning, note whether the project is like-for-like replacement, dual-fuel planning, or conversion to a heat pump.

Troubleshooting

Error Codes

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E003 Combustion / venting

Ignition failure

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

False flame

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

Flame loss during operation

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.
E030 Combustion / venting

Abnormal exhaust temperature

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

How GreenFlow handles NPF 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

Dev W.

I had a breakdown of my cooling system and Hanna at Green Flow responded to my request right away. They scheduled me same day. The team at Green Flow was easy to communicate with over phone and text. They kept me updated on delays on arrival of the...

Anna G.

They quickly identified the issue with the heating system and fixed it efficiently. He explained everything clearly and made sure I understood what was going on. Very professional and reliable, extremely satisfied with the service.

Randy J.

Thanks to Andrey for an amazingly quick response to my request for a service call. He diagnosed and fixed my issue within 24 hours of my asking for help. Excellent service. Thanks.

Anna F.

They showed up within an hour of me making the call on a Sunday. They fixed our system and taught us how to replace the fuse in the future. We would definitely call again.

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