Tennant 5680 Service Manual page 300

ELECTRICAL
YES
YES
IS VAC FAN ON
ALL THE TIME?
NO
SEE
FLOAT TESTING
IS ERROR CODE 13 YES
ACTIVE?
NO
CHECK VOLTAGE
0V
ACROSS M3
43 GRN AND 18J YEL
36V
REPAIR OR
REPLACE
43 GRN
4 -- 180
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DOES VAC FAN TURN
NO
ON DURING
DIAGNOSTIC TESTING?
YES
REPLACE M3
ERROR CODE 12
YES
STILL ACTIVE?
NO
YES
REPAIR OR
REPLACE
43 GRN
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IS ERROR CODE 13
NO
ACTIVE?
YES
CHECK FAN MOTOR
AMP DRAW
BAD
REPLACE VAC
FAN MOTOR
36V
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REMOVE 43 BRN
FROM M3 AND
RE- -RUN DIAGNOSTICS
POWER OFF
REMOVE CONTROL
NO
BOARD FROM HARNESS
CHECK CONTINUITY
43 GRN TO GROUND
RESET CB- -2
RE- -RUN DIAGNOSTICS
DO FANS NOW WORK?
NO
CHECK VOLTAGE
30 ORA AND 18J YEL
AT M3 RELAY
TO MACHINE GROUND
0V
REPAIR OR
REPLACE
30 ORA AND 18J YEL
REPLACE
CONTROL BOARD
5680/5700 MM406 (6- -03)