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Navien Error Code Boost Interval Time: Status Information item 27 – Boost Interval Time (Combi Boiler)

Updated · by Aurora Star Tech Inc.

Navien error code Boost Interval Time on a combi boiler means: Status Information item 27 - Boost Interval Time. It is also called Navien diagnostic code Boost Interval Time.

Low severityCombi BoilerNavien NCB-H

Homeowner? What Navien code Boost Interval Time means for you

Usually minor Your combi boiler is reporting: Status Information item 27 - Boost Interval Time. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

Safe things you can check yourself

  • Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
  • Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
  • Look at the pressure gauge on the boiler. If it reads much lower than usual or near zero, or water is leaking, call a technician.
  • Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
  • Check that the boiler gas valve is open (handle in line with the pipe).
  • Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
  • If only hot water is missing, check that the hot water tap is open far enough to start the heater.

Call (647) 657-2977Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Navien error code Boost Interval Time mean?

Boost interval set time in minutes. Read-only item 27 in the Status Information menu.

Applies to: NCB-190/060H to NCB-250/150H

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Navien models that use code Boost Interval Time

NCB-190/060HNCB-190/080HNCB-240/110HNCB-240/130HNCB-250/150H

Other Navien Combi Boiler codes

CodeMeaning
AHU connection iconAir handler connection
AHU SH Set TempStatus Information item 5 - AHU SH Set Temp
Anti-freeze iconAnti-freeze mode active
Approx. Boiler FlowStatus Information item 14 - Approx. Boiler Flow
Auto air purge iconAuto air purge running
Cascade/Main iconCascade main unit
Combustion iconBurner combusting
DHW demand iconDHW demand present
DHW FlowStatus Information item 15 - DHW Flow
DHW operation iconDHW preheat feature active
DHW Set TempStatus Information item 4 - DHW Set Temp
DHW set temperatureDHW set temperature display

All Navien Combi Boiler error codes →

Navien code Boost Interval Time: homeowner questions

What does Navien code Boost Interval Time mean?

Status Information item 27 - Boost Interval Time. Boost interval set time in minutes. Read-only item 27 in the Status Information menu.

Is it safe to keep using my combi boiler with code Boost Interval Time?

Usually yes. Code Boost Interval Time is normally minor, but if it keeps coming back have it checked.

Can I reset Navien code Boost Interval Time myself?

You can try one reset (power off for 30 seconds, then on). If Navien code Boost Interval Time comes back, the cause is still there and a licensed technician should check it.

Who can fix Navien code Boost Interval Time near me?

Aurora Star Tech Inc. repairs Navien combi boilers in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: Tankless Water Heater No Hot Water: What to Check · Boiler Not Heating: What to Check

Troubleshooting guides

Source: Navien NCB-H User's Information Manual (V1.0 Apr 2024), 3.3 Accessing Basic Menu Items, p.12-13. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.

Emergency HVAC Service

647-657-2977