TROUBLESHOOTING
Co nv erg e® ▪ Se rvice Ma nual ▪ MN-47 241 ▪ Rev 1 ▪ 6 /22
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Convection Fan is not Operating
Does the facility’s power supplied power match the
equipment’s data tag?
No
Correct any site facility issues before
testing.
Yes
Is the chamber on and calling for heat?
No
Turn the chamber ON.
Yes
Locate the 4-wire VFD connection on the control
board. Chamber 1 X16, Chamber 2 X17, Chamber 3
X18. Measure DC voltage across the Yellow and
orange wire. Is there 2- 5VDC?
(If motor is set to 100%, voltage should be 4.4VDC; at
20% it should be 2.5VDC.)
No
Check the VFD cable connector pins
are all secure and fully pressed into
the Molex connector. Make sure the
connector is properly at the control
board.
Replace the control board.
Yes
Disconnect the Molex connector between the VFD and
Motor. Is there voltage output from the VFD to the
motor?
No
Replace the VFD.
Yes
Check the red and blue wires on the VFD connection
at the control board. Is there a Hertz (Hz) signal
coming back between the red and blue wires?
(100% fan will have a signal of 778Hz;
50% fan speed will be 530Hz.)
No
Replace the motor.
Yes
Is airflow present coming through the jet plates?
No
Cool down oven to a safe
temperature and remove jet plates.
Inspect the upper and lower jet
plates for cleanliness and
obstructions.
Yes
The oven is performing as intended.
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