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-27
N o C o o l i n g F a n O p e r a t i o n
Is L1 power at RBH
terminal X4/416?
Is L1 power at RBH
X4/414?
Is L1 power at TB 15?
No repair wiring between
RBH/416 and TB 17/3
No
Yes
Yes
No
Ensure LED D01 is lit,
replace RBH if necessary
No
Yes
Repair wiring between TB
15 and RBH X4/414
Repair wring between TB 15
and fan thermal switch
Is L1 power at fan
thermal switch?
No
Is L1 power going through
the fan thermal switch?
Thermal switch closes at 130ºF
(54ºF). If above 130ºF (54ºF),
replace thermal switch
Is L2 power at each
cooling fan motor?
L2 supplied from TB 12
Is L1 power at each
cooling fan motor?
Repair wiring between thermal
switch and cooling fan motors
Confirm voltage across
motor wires and repair/
replace cooling fan motors
as required
No
Yes
Yes
No
No
Yes
Yes
Summary of Contents for CT EXPRESS 4 10ESi
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