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-21
N o D i s p l a y / C o n t r o l n o t p o w e r i n g o n ( U n i t D e a d )
Is voltage across L1/L2 at
main TB?
Is voltage across terminal
1/F1 and terminal 1/F2
6.3A fuses?
Is voltage across terminal 2/F1
and terminal 2/F2 6.3A fuses?
Check cord/plug/main
circuit breaker – Install/
Repair/Reset as needed
No
Yes
Yes
No
Repair wiring between
main TB and F/1F2 fuses
No
Yes
Replace blown F1/F2
fuses(s)
Repair wiring between F1/F2
and Power Supply
Is voltage across L1/N at
power supply?
No
Is 12 VDC across terminals
V+ and V- at power supply?
Replace power supply
Is there 12 VDC across
pin 1-2 on On/Off board?
Test On/Off board cable for
continuity. If cable ok, replace
display board
Is 12 VDC across display
(LCD) terminals DB3 and
DB1?
Repair wiring between power
supply and LCD
Test On/Off board -
On = Temporary switch between 1-3
Off = temporary switch between 1-4
No
Yes
Yes
No
No
Yes
Yes
Summary of Contents for CT EXPRESS 4 10ESi
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