LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual - Manual (Page 18)

8
Service Manual - NeoTherm 500
Unit is Running, But Building is Still Cold
A6
Yes
No
Clear it
Air inlet is
blocked?
Clean
Air intake
inside unit is
plugged?
Yes
No
Clean, blow out
(Gas/air mixture is correct,
but not enough gas/air
mixture is supplied.)
Dirty fan? Yes
No
Burner and/or
heat exchanger
plugged?
Yes
See “Cleaning the Burner and Heat Exchanger”
Section C5