Tennant EC-H2O T12, Service Information Manual, Page: 131 / 178

T12 Service Information 9009917 (12-12)
4-63
TROUbLESHOOTING
Vacuum Fan Failed to Turn ON
SteP action value(S) yeS no
1 • key on
• enable scrubbing vacuum fan(s)
• Is there a pertinent LCd warning or fault message
displayed?
See “LCd
warnings” or
“LCd faults”
Sections
Go to Step #2
2
• key off
• See “manual mode” section of this manual
• activate vacuum fan(s) in manual mode
• does the vacuum fan(s) turn on?
Go to Step #5 Go to Step #3
3 • key off
• See “Self-Test mode”
• does the Self-Test display output circuits j3-3, or j3-2
as open or shorted?
Correct open
or Short Cir-
cuit Condition
Go to Step #4
4 • key off
• See TeSTInG vaCuum fan (SCrubbInG) in the Ser-
vICe section of this manual
• do the vacuum fan motor pass the testing?
See TeSTInG
vaCuum fan
(SCrubbInG)
Go to Step #5 repair or re-
place vacuum
fan motor
5
• key off
• reconnect vacuum fan motor to main wire harness
• key on
• enable scrubbing vacuum fan subsystem
• Test voltage applied to the scrubbing vacuum fan
subsystem as shown on the electrical schematic
• are the electrical circuits operating as shown on the
electrical schematic?
Go back to
Step #1
Identify volt-
age drop
Location and
repair or re-
place neces-
sary Compo-
nents
Terms:
LCd = Liquid Crystal display
j3-3 = water pu module Connector #3, pin #3
j3-2 = water pu module Connector #3, pin #2