T R O U B L E S H O O T I N G T R E E S
MN-36008 (Rev. 8) 01/16 • COMBITHERM CT EXPRESS • D-18
Two Speed Motor - No Low Speed Motor Operation
(without motor protection switch)
L1/A1 from RBH X3/304,
L2/A2 from TB 13-4
Is K-52 contactor closing?
Yes
No
Is K-52 contactor coil
energized?
No
Yes
Replace K-52 contactor
Repair wiring between K-52/A2
and K-52/4
Is L1 power at terminal 4 of
K-52 contactor?
No
Is L1 power at terminal 3
of K-52?
Replace K-52 contactor
Is motor relay coil energized?
L1/14 from TB 16, L2/13 from N7
high limit through motor high limit
Is L1 power at black wire
on motor?
Repair wiring between K-52/3
and motor
Is L2 power at terminal 12
of motor relay?
No
Yes
No
Yes
Yes
L2/12 from TB 14/2
Is motor running?
No
Yes
Is L2 power at terminal 8 of
motor relay?
No
Yes
Is there voltage across
black/white wires at motor?
Repair wiring between
motor relay and motor
No
Yes
Yes
No
No
Yes
Replace motor relay
Ohm out motor and replace
if necessary
Low speed operation is ok
Summary of Contents for CT EXPRESS 4 10ESi
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