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Navien Heat pump NAZ Series

Navien HVAC systems, A/C and heat pumps Heat pump Repair, maintenance, and replacement planning
Navien NAZ Series product image

Technical Specifications

Product Specs

  • Brand: Navien
  • Model or series: NAZ Series
  • Equipment type: Heat pump
  • Product group: HVAC systems, A/C and heat pumps
  • System role: Heat pump equipment for heating and cooling
  • Application: Residential, light-commercial, or managed-property comfort applications
  • 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 outdoor heat pump model, serial number, matched indoor equipment, auxiliary heat setup, thermostat or communicating control, refrigerant, voltage, and capacity.
  • Share no-heat, no-cooling, outdoor icing, defrost behavior, short cycling, weak airflow, control alerts, or unusual noise.
  • For upgrade planning, note whether the project involves ducted, ductless, hybrid, cold-climate, or fossil-fuel-to-heat-pump options.

Troubleshooting

Error Codes

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F0 Temperature / sensor

Indoor ambient temperature sensor error

Record the Navien code, check visible intake, exhaust, filter, thermostat, controller, and clearance conditions without opening panels, and schedule service if the condition remains.
F4 Temperature / sensor

Outdoor ambient temperature sensor error

Record the Navien code, check visible intake, exhaust, filter, thermostat, controller, and clearance conditions without opening panels, and schedule service if the condition remains.
F5 Temperature / sensor

Outdoor heat exchanger temperature sensor error

Record the Navien code, check visible intake, exhaust, filter, thermostat, controller, and clearance conditions without opening panels, and schedule service if the condition remains.
F6 Temperature / sensor

Outdoor heat exchanger outlet temperature sensor error

Record the Navien code, check visible intake, exhaust, filter, thermostat, controller, and clearance conditions without opening panels, and schedule service if the condition remains.
F7 Temperature / sensor

Compressor discharge temperature sensor error

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

How GreenFlow handles NAZ 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.

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.

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...

John F.

I needed 2 new AC units and decided to go with high efficiency heat pumps. I chose Greenflow because of the equipment they offered, and the price (2nd lowest quote and much cheaper than the average of all quote we received). Their technicians were very detail oriented and...

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