GE JB905 Technical Service Guide

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

GE JB905 Specifications

General

Brand	GE
Model	JB905
Category	Ranges
Language	English