LAARS HP-M2 Series - Installation, Operation and Maintenance Instructions - Manual (Page 28)

Page 28 LAARS Heating Systems
RED “PURGE” Light flashing - blower or stack
switch failure or possible flue blockage.
RED “VALVE” Light flashing - valve, igniter
or flame sense failure (combustion related problem).
NOTE: If the stack switch contacts are closed
for any reason when the blower isn‘t operating a
sequence will not occur and after 45 seconds the
control will “lock out “ and the “PURGE” light will
flash. If the stack switch contacts are open and do not
close during purge period, after 5 minutes the control
will lock out and the “PURGE” light will flash.
If the boiler does not operate, the green “power”
light is on and no indicator lights are flashing, check
for an open pressure switch, low limit switch (on HW-
M2 series), operating control or safety limit switch on
either series. For additional troubleshooting
information refer to the trouble shooting flow charts
on the pages that follow.
VALVE LED
OUT OF
PRODUCTION