Lochinvar MP2 - Manual (Page 30)

The control was unable to read a piece of information stored
in its memory (FIG. 53). Because of this, the control was
required to reload the factory settings into all of the items in
the ADJUST menu. The control will stop operation until all
of the items in the ADJUST menu of the control have been
checked by the user or installer.
Note: The Installer / Adv DIP Switch must be set to Adv in
order to clear the error.
The control is no longer able to read the outdoor sensor due
to a short circuit (FIG. 54). In this case the controlassumes
an outdoor temperature of 32°F (0°C) and continues opera-
tion. Locate and repair the problem as described in
INS7141. To clear the error message from the control after
the sensor has been repaired, press either the Menu or Item
button. This error message only occurs if the External Input
/ Stand Alone DIP switch is set to Stand Alone.
The control is no longer able to read the outdoor sensor due
to an open circuit (FIG. 55). In this case the control
assumes an outdoor temperature of 32°F (0°C) and contin-
ues operation. Locate and repair the problem as described
in INS7141. To clear the error message from the control
after the sensor has been repaired, press either the Menu
or Item button. This error message only occurs if the
External Input / Stand Alone DIP switch is set to Stand
Alone.
The control is no longer able to read the boiler supply sen-
sor due to a short circuit (FIG. 56). The control will not oper-
ate the boiler(s) until the sensor is repaired. Locate and
repair the problem as described in INS7141. To clear the
error message from the control after the sensor has been
repaired, press either the Menu or Item button.
The control is no longer able to read the boiler supply sen-
sor due to an open circuit (FIG. 57). The control will not
operate the boiler(s) until the sensor is repaired. Locate
and repair the problem as described in INS7141. To clear
the error message from the control after the sensor has
been repaired, press either the Menu or Item button.
The control is no longer able to read the boiler return sen-
sor due to a short circuit (FIG. 58). The control will continue
to operate normally. Locate and repair the problem as
described in INS7141. To clear the error message from the
control after the sensor has been repaired, press either the
Menu or Item button.
FIG. 53
FIG. 54
FIG. 55
FIG. 56
FIG. 57
FIG. 58
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ERROR MESSAGES