Navien NR-35D User Manual page 26

Checklist before Reporting Failure
Symptom
Heating isn't working.
26
Checklist
Isn't temperature setting too low?
Isn't heating switched off or set as
only hot water?
Please check if programmed time
is off
Are you using hot water?
Isn't heating valve for each room
locked?
Isn't heating filter blocked?
Is heating pipe filled with air?
Solution
Press either or button then turn the dial
clockwise to increase heating temperature.
Please adjust the time program for heating
Heating does not supply when hot water is on
Please open heating valve for each room
Please clean heating filter.
Open the air removal valve on the top of
distributor for each room to remove air from
heating pipes.