MN-35949
•
Rev 07
•
01/20
•
Combitherm® CT PROformance™ and CT Classic™ Series Technical Service Manual
•
81
Troubleshooting
Classic: No Low Speed Convection Motor Operation (E03/E04)
Does the motor fan wheel spin freely?
No
Remove the obstruction and/or replace the convection motor
as needed.
Yes
Is the K51 low speed contactor being energized?
No
Determine which leg of power is missing and correct:
• A1 is L1 supplied from the Control Board (CB) terminal X01
pin 3 through the N/C contacts 21/22 on the K50
contactor (K51 will not energize if K50 is energized).
• A2 is L2 supplied from K50 A2 which is supplied
terminal block TB 27-19.
Yes
Is the K51 contactor closing?
No
Replace the faulty contactor.
Yes
Is there line voltage across terminals 1/3/5 on the K51
contactor?
No
Test for blown F4/F6/F7 fuse(s) and/or repair the wiring issue
between the fuses, K50, or K51 contactors.
Yes
Is there line voltage across terminals 2/4/6 on the K51
contactor?
No
Replace the faulty contactor.
Yes
Is there line voltage across the black/blue/brown wires at
the convection motor?
No
Repair the wiring issue between the K51 contactor and the
convection motor.
Yes
Is the convection motor running?
No
Replace the faulty convection motor and the capacitors
as applicable.
Yes
The low speed convection motor is operating.
Содержание COMBITHERM CTP6-10e
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