Laars MASCOT LX, Service Manual

Page: 27 / 94

21
Mascot LX Service Manual
A1
Quick Checkout Procedure (continued)
Yes
No
Does the
blower start?
See Section B11 - “Blower Problems.”
Check for continuity across the contacts
for the air pressure switch. When the blower
is running, you should see zero volts and
zero Ω across these contacts.
No
Is the air
pressure switch
closed?
See Section B12 - “Air Pressure Switch”
Yes
No
Programming
is correct?
See “Operating Displays” and
“Changing Setpoints”
Yes
Check the programming -
setpoints, etc.
Last resort -
Replace the SIT controller.
See Section B30.
Yes
Unit has
outdoor sensor
installed?
Warm weather shutdown is
always active when the
outdoor sensor is installed.
Yes