Navien LCB700-21LC, Installation & Operation Manual

Page: 70 / 96

70 Maintaining the Boiler
If hot water will not flow and you suspect that the boiler is
frozen, follow these steps:
1. Press the Power button (
) on the front panel to turn off
the boiler.
2. Close the oil line valve.
Oil Line
Valve
Open Closed
3. Open the hot water tap that is closest to the boiler.
4. Use a hair dryer or a portable electric heater to heat up both
the primary and secondary heat exchangers.
5. Check every few minutes to see if water is running at the
open tap.
6. When the water starts flowing again, check the boiler and
piping for leaks. If you detect any leaks or the boiler is not
operating properly, contact an authorised technician or
licensed professional.
Note
This boiler requires very little maintenance, however
a qualified technician should inspect the boiler at the
beginning of every heating season and/or when there
is a problem.
12.4 Maintenance Schedules
Owner maintenance
Daily
Ɣ
Check boiler area
Ɣ
Check pressure/temperature gauge
Monthly
Ɣ
Check flue piping
Ɣ
Check condensate drain
Periodically
Ɣ
Check flue termination screens
Every 6 months
Ɣ
Check boiler piping (oil and water) for
leaks
Non-heating
season
Ɣ
Shut boiler down (unless boiler used for
domestic hot water)
Service technician (See the following instructions)
Annual Start-up
General:
Ɣ
Address reported problems
Ɣ
Inspect interior; clean and vacuum if
necessary
Ɣ
Clean condensate trap and fill with fresh
water
Ɣ
Check for leaks (water, oil, flue,
condensate)
Ɣ
Verify flue and air lines are in good
condition and sealed tight
Ɣ
Check system piping
Ɣ
Check control settings
Ɣ
Check ignition and UV sensor (clean and
reposition)
Ɣ
Clean oil filter
Ɣ
Replace old flexible oil hose and oil
nozzle with new ones
Ɣ
Check wiring and connections
If combustion or performance indicate
need:
Ɣ
Clean heat exchanger
Ɣ
Remove and clean return adapter filter