Navien NR-35D, User Manual

Page: 25 / 76

25
Checklist before Reporting Failure
Symptom Checklist Solution
Boiler isn’t operating
Holiday mode displayed on the screen?
Press either or button to operate
heating.
Service icon displayed on the screen?
Please confirm the error code (example: E003)
on the center of the Room controller screen
and follow instructions in ‘Self-Diagnosis’ page.
Is the gas valve locked?
Open the gas valve and switch the boiler off
and on. Replace the gas if it is LPG.
Hot water isn’t coming out.
Is the water supply cut off? Please wait until water is supplied again.
Is cold water valve locked?
Please open direct water valve connected to
the boiler.
Isn’t the hot water tap open too little? Please open hot water tap more so that the
flow is more than 20L per minutes.
Is hot water temperature set too low? Press ‘ ’ button then increase hot water
temperature by turning the dial clockwise.
Is the tap open more towards cold
water when using mixed water supply? Please control cold and hot water mixture.
Are you using hot water in too many
places at the same time?
Hot water volume will decrease if you use
hot water in various places at the same time.
Please use less hot water.
Hot water pipe is blocked etc. Please contact our service center for checkup.