Trane UHMB060ACV3VA Series Service Facts page 44

Upflow/ horizontal left and downflow/horizontal right, gas-fired, direct/non-direct vent, variable speed, modulating, condensing, communicating furnaces
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Service Facts
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.
Install correct size orifices
and LPkit
NO
Check operation
Check burner alignment
Correct as needed
Check operation
44
4 Flash Fault LED
User Interface to
View number 1 of
Is the burner orifice
size 56 and
YES
BAYLPKT220B or
BAYLPSS220B LP kit
installed?
YES
electrical power to
Correct as needed
YES
Check operation
Check flue pipe for correct sizing
and long horizontal runs or slope
less than ¼" per linear foot.
Correct as needed
NO
burners impinging
YES
Scroll through
Last 4 Faults
User Interface
shows a
ROLLOUT
OPEN?
Is LP gas being
used?
NO
Disconnect
furnace
Is flue piping
restricted?
NO
Remove, clean,
and reassemble
burners.
Push RED reset
on rollout switch
Are all burner flames
directed into heat exchanger
Cycle power to
with a tight pattern?
furnace and call
(inadequately aired burners
for heat
tend to roll back)
Ignition occurs
Do all burners
ignite within 5
NO
seconds?
YES
Are flames from
comes on, do
flames stay
on sides of heat
consistent?
exchanger?
Replace Roll out
Check operation
Check combustion air
blower, venting, heat
YES
exchanger for blockage
NO
When fan
Replace heat
NO
exchanger
Check operation
YES
switch
UHM-DHM-SF-1H
(ie. sooting)

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