Navien NFC-200 Service Manual

106 NFC Service Manual
Version 1.0
5.2.21 407Error
Error Condition and Check Items
Error Description
E407 Abnormal Hot water outlet 1 sensor (After mixing valve)
Check Items
1. Check for controller harness disconnection.
●
Check for any disconnections between the hot water outlet 1 temperature sensor (after
mixing) harness.
2. Change hot water outlet 1 temperature sensor (after mixing)
●
If the problem persists after completing (1) close the external direct water supply valve
and purge water within water pipes. Change hot water outlet 1 temperature sensor (after
mixing).
3. Change PCB
●
If the problem persists after completing all the actions above, change the PCB.
Hot water outlet
temperature sensor

Navien NFC-200 Specifications

General

Brand	Navien
Model	NFC-200
Category	Boiler
Language	English