Name: Navien NHB-150
Brand: Navien
Rating: 5 (1 reviews)

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120 NHB Service Manual

Version 1.0

5.2.24 615Error

Error occurrence conditions and check items

Error Description

E615 error Abnormal signal input by PCB.

Check items

1. Turn the POWER RESET switch OFF then ON (or unplug and replug the power supply.

2. If the system still displays E615, replace the main PCB.

5.2.25 740Error

Error conditions and Check Items

Error Description

E740

Abnormal outdoor sensor

If an error (under 2.2kΩ or over 122.2kΩ) in the outdoor sensor is detected continuously for

3 seconds, The system displays the error message E740 on the front panel. If this occurs, the

boiler changes the control mode from Reset Curve Mode to Normal Mode.

Check items

1. Check the parameter setting. (refer to page 49-51)

2. Check the outdoor sensor

Is the Outdoor sensor

installed properly?

Is the outdoor thermistor

normal?

Check connecter

(#1 and #2 of CN11)

Change the Outdoor Reset Control

Mode setting (refer to page 49-51).

Replace the outdoor thermistor.

Yes

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