LAARS NeoTherm NTV (Sizes 150–285 MBTU/h) - Service Manual - Manual (Page 17)

7 Service Manual NeoTherm 80 - NeoTherm 285
Changing Control Settings, Change Not Complete
Original (White) Interface
NeoTherm units were produced using two types of user interfaces. (See
Section A1 to identify the kind of interface used on your unit.) These
instructions apply to units with the original (white) user interface.
In certain situations, the controller used in this unit can go into a “Stand-
by” mode. There is no lockout or hold, but the unit still will not run.
This can happen if you begin to change one of the control settings, but
do not finish the process. For example, let’s say you want to change the
DHW setpoint from 180° to 175°. You use the menus to go to the item
for the DHW setpoint, then enter the new number – “175.” At this point,
you are supposed to press the Done button to send the new setting to
the controller. However, if you do not press Done or OK, the control-
ler will go into the Standby mode. The setting for the DHW setpoint will
remain at the old setting (180°), because at this point the controller still
has not received the new setting. More importantly, the unit will not fire
because it is still waiting for that new setting. There is no indication of
this on the User Interface.
To recover from this, you need to return to the point where you were
making the change, and enter the new setting again. In this case, you
would step through the menus until you returned to the item for the DHW
setpoint. Enter the new number again (175°), then press Done. At that
point, the controller will leave the Standby mode, and the unit should
begin operating normally.
In order to troubleshoot this kind of situation, ask yourself, “What was I
just doing?” Were you trying to change a control setting? Which one?
You probably need to return to that setting, enter the new value again,
then remember to press Done.
A5