44 UHM-DHM-SF-1H
Service Facts
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User Interface to
View number 1 of
Last 4 Faults
User Interface
shows a
ROLLOUT
OPEN?
Disconnect
electrical power to
furnace
Remove, clean,
and reassemble
burners.
Push RED reset
on rollout switch
Cycle power to
furnace and call
for heat
Ignition occurs
Do all burners
ignite within 5
seconds?
Is LP gas being
used?
NO
Is the burner orifice
size 56 and
BAYLPKT220B or
BAYLPSS220B LP kit
installed?
YES
Install correct size orifices
and LPkit
Check operation
NO
YES
Check burner alignment
Correct as needed
Check operation
Check flue pipe for correct sizing
and long horizontal runs or slope
less than ¼” per linear foot.
Correct as needed
NO
Is flue piping
restricted?
Correct as needed
Check operation
YES
Are flames from
burners impinging
on sides of heat
exchanger?
NO
YES
When fan
comes on, do
flames stay
consistent?
Replace heat
exchanger
Check operation
NO
Replace Roll out
switch
Check operation
YES
DEFINITION:
Limit switches are safety
devices that will open when an
abnormal high temperature has
been sensed.
REMOVE ALL JUMPER
WIRING TO SWITCHES!
Under no circumstances, shall
these switches be left
jumpered when not
troubleshooting.
YES
Are all burner flames
directed into heat exchanger
with a tight pattern?
(inadequately aired burners
tend to roll back)
NO
NO
Check combustion air
blower, venting, heat
exchanger for blockage
(ie. sooting)
YES
4 Flash Fault LED
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