Service manual

troubleshooting trees

T r o u b l e s h o o T i n g T r e e s • C o m b i t h e r m C t e x p r e s s t e C h n i C a l s e r v i C e m a n u a l • D – 20

Single Speed Motor - No Motor Operation (without motor protection switch)

L1 supplied to blue wire

from RBH/X3/300

Yes

L1/14 from TB 16, L2/13

from N7 high limit through

motor high limit

L2/12 from TB 14/2

Replace motor relay

Repair wiring between motor

relay and motor

Ohm out motor and replace

if necessary

Is there L1 power at the blue

wire of the motor?

Is motor relay coil

energized?

Is L2 power at terminal 12

of motor relay?

Is L2 power at terminal 8

of motor relay?

Is there voltage across blue/

white wires at motor?

Is motor running?

Motor is working