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Blodgett Oven – Fan Issue
I have a Blodgett SHO-100-G oven acting up. When it is on the cook setting, the fan intermittently shuts of and will not restart until a cool down period. When it does this, the fan neither works in the cook or “cool down” setting. I though I might have bad fan motor, but after waiting a bit, I turned it on again and let the fan run for 2 hours on the cool down setting without any issue. The issue only occurs while in the cook setting.
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9 Replies
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So the oven still heats, but the fan stop’s. That shouldn’t be possible due to the proofing switch in the fan motor. So It has to be heat related. Two possibilities, the door switch adjustment is on the edge and the expansion of heat makes it open, or the motor bearings are bad or the blower motor vents are plugged. Measure the current the motor is using to verify that it doesn’t have a winding short and that the bearings are not causing excessive load. Check that the motor vents in the housing are clean and can move air. If the oven is a double stack top, check that the bottom oven vent panels are correctly installed to prevent heat from the bottom oven having a effect.
There is one other cause of the motor overheating, that is the power supplied to it. If it gets low voltage or you have a harmonic in the electrical system it will run hot.
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Yes, the oven heats for a time, then shuts down. Fan stops, and thermostat indicator light turns off and won’t come back on even if temperature is turned up. At that stage the motor is very hot to the touch and will not come on at all, even in cool down setting. I don’t think the motor bearings are the issue, because it will run in “cool down” mode without shutting off (ran for 2 hours). So something is happening while heating the oven that is causing the motor to overheat and shut down. Maybe the added heat from the oven is enough to overheat the motor?
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Here is a parts list in case you need it.
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What year oven do you have? mechanical or electronic thermostat? There are 3 different versions of that oven. Big changes were 11/2005.
Because your thermostat light goes out, you may want to test the fan switch and cool-down switch to not be intermittent. But heat saturation problems can be difficult to troubleshoot. being the motor would not run in cool-down mode after quitting, tells me the motor overload opened inside the windings. that can only be happening with to high of motor load, or a power/ventilation problem.
Can you get a picture of the attached wiring diagram?
I’m not sure, but I think the thermostat gets power from the motor centrifugal switch. So yes, the thermostat light would go out when the motor slows down.
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I have attached some pictures. Including the information plate with serial # which might help you with the date. We bought the ovens used. The wiring diagram was not inside the sleeve when I took the control panel off. There is a circuit board behind the thermostat dial. Also, there appear to be 2 capacitors on the motor.
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Picture help a lot. The blower motor is a PCM type motor. If the capacitors on a PCM motor are out of spec, it will overheat.
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Picture help a lot. The blower motor is a PCM type motor. If the capacitors on a PCM motor are out of spec, it will overheat. The closest one in the picture does show damage. Note that the motor is April 2019 build date.
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Not having much luck with any specs on the existing capacitors. There is nothing printed on them. Best I can figure is a Blodgett 58777, which appears to be very similar to the ones in the motor.
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Finally got correct capacitor specs, and have them installed. Oven is working great. Thanks for the help.
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