Convection Element; Convection Fan Motor - GE JB905 Technical Service Manual

Convection Element

The
convection
element
does not
work.
Is the circuit breaker open or fuse blown?
No
Does the touch panel indicate that the
convection element is functioning?
No
Unplug the oven.
Is continuity present between the ERC and
the 220 volt power input terminal?
Yes
Replace the ERC.

Convection Fan Motor

The
convection
fan motor
does not
work.
Is the circuit breaker open or fuse blown?
No
Does the touch panel indicate that the
convection oven is functioning?
No
Unplug the oven.
Is continuity present between the ERC and
the 220 volt power input terminal?
Yes
Replace the ERC.
Reset the circuit
Yes
breaker or replace the
fuse.
Unplug the oven and measure the resistance of the
Yes
convection element.
Is the resistence approximately 22.9 ohms?
Is continuity present between terminal lug
(CONV) on the ERC and the convection
element?
Is continuity present between terminal lug
(L2) and the 220 volt power input terminal?
No
Repair faulty wiring.
Note: Troubleshoot the
oven switch before before
performing this procedure.
Reset the circuit
Yes
breaker or replace the
fuse.
Unplug the oven and measure the resistence to
the fan motor.
Is the resistance between terminal CW on
the oven control panel and the fan motor
Yes
approximately 110.4 ohms?
Is the resistance between terminal CCW on
the oven control panel and the fan motor
approximately 108.0 ohms?
Is continuity present between terminal CW on the
ERC and the fan motor capacitor?
Is continuity present between terminal CCW on the
ERC and the fan motor capacitor?
No
Repair faulty wiring.
– 37 –
No
convection element.
Yes
No
Repair faulty wiring.
Yes
No
Yes
No
Yes
Replace the fan motor capacitor.
Does the fan motor work?
No
Replace the
Replace the motor.
Repair faulty wiring