LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual - Manual (Page 20)

10
Service Manual - NeoTherm 500
On systems using anti-freeze –
This can occur if the concentration of anti-freeze is too high. At concen-
trations above 35%, localized boiling can occur, and this can produce
noise.
Unit is Noisy
A10
On systems using the Current user interface –
To see if the unit is locked into high fire or low fire -
From the Home screen, press “i” to go to the “Info/Install” screen. High-
light “Test” and press “OK.” In the Test menu, highlight “Manual Burner
Operation” and press “OK.” Be sure “Firing Control” is set to “Auto.” If it
is not, log in using the password “lnt”, and change the setting to “Auto.”
Unit Runs in High or Low Fire Only
A9