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Vulcan ultra 30 fan speed slowed down suddenly

Our Vulcan ultra 30 has suddenly reduced its fan speed. Changing the fan speed on the controller doesn't help. Any ideas?

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SOURCE: we have a Vulcan Ultra high efficiency gas ducted heating

Gas ducted central heater won't switch on all of a sudden

Posted on Sep 21, 2010


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Fans work but only after it gets warmer than it usually runs 2003 dodge caravan. The code is slow fan not working is there a separate fuse or switch?

DESCRIPTION The dual radiator fans are mounted to the back side of the radiator . The radiator fan consist of the fan blade, electric motor and a support shroud which are all serviced as an assembly.
A/C PRESSURE TRANSAXLE OIL TEMPERATURE Fan Operation Speeds: Initial Max Initial Max Initial Max Fan On: 104°C (220°F) 110°C (230°F) Fan Speed Duty-Cycles (Ramps-up) from 30% to 99% 1,724 Kpa (250 psi) 2,068 Kpa (300 psi) Fan Speed Duty-Cycles (Ramps-up) from 30% to 99% 96°C (204°F) 111°C (232°F) Fan Speed Duty Cycles (Ramps-up) from 30% to 99% Fan Off: 101°C (214°F) Fan Speed Duty-Cycles (Ramps-down) from 99% to 30% 1,710 Kpa (248 psi) Fan Speed Duty-Cycles (Ramps-down) from 99% to 30% 89°C (192°F) Fan Speed Duty Cycles (Ramps-down) from 99% to 30%

Mar 08, 2018 | Dodge Cars & Trucks

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When switched on, it starts At Maximum speed. You can`t slow it down to a slower speed.

If this is for a Mac and is after a hdd swap you will need to perform a SMC reset (google how to do as different for each model). If you have changed to a SSD you will need to download a fan control program and manually reduce speed of fans

Mar 06, 2018 | Computers & Internet

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Fan motor is slowing down and not keeping the desired temperature

The circuit diagram for the standard control model shows the blower has a two-speed motor, connected directly to the power line in "Cool" mode, or connected to the temperature control in "Cook" mode. When the blower slows down during cooking, switch it temporarily to "Cool" mode. If it goes to normal speed, the problem is with the mode switch contacts or the wiring terminals between the fan mode switch and the temperature control board, or the control board itself.

If the speed does not change, check the wiring terminals at the speed switch common terminal (I assume your problem occurs in both low and high speeds). If you find tarnished, loose, or burned terminals, clean, repair or replace as needed. (In extreme cases, a loose terminal will cause the wire to overheat, damaging the insulation, oxidizing the terminal and causing a high-resistance condition that will reduce the voltage available to the motor.) If the connections are all good, the motor bearings are probably getting sticky at high temperatures. Let the oven get hot enough for the blower to slow down, then shut it off and check the blower bearings while wearing oven mitts.

May 12, 2014 | Southbend SLGS-22SC Gas Double Oven

1 Answer

GE JVM1430 over the range microwave/exhaust fan unit. The exhaust fan (not the microwave cooling fan) all of a sudden has its speed slowed down considerably. The unit vents out the back, not top. ...

Sounds like a strip down of the fan and lubricate the bearings with sewing machine or thin cycle oil will do the trick.
Hope that helps.

Jan 20, 2011 | Microwave Ovens

3 Answers

We have a Vulcan Ultra high efficiency gas ducted heating

Gas ducted central heater won't switch on all of a sudden

Nov 04, 2009 | Vulcan AUW230A Heater

2 Answers

Ceiling fan is controlled by dimmer

Yes, if the hot wire going up to the fan is coming off the dimmer, it is reduced voltage and will slow down. There maybe a separate hot from another switch??

If you need further help, I’m available over the phone at

Jul 26, 2009 | Hampton Bay AC414-LRU 52'' Kemper...

2 Answers

I installed 2 industrial ceiling fans with 5 speed controls but my customer want the fans to rotate slower than the lowest setting. Could I install an ordinary lighting dimmer switch either before the...

A regular dimmer switch will not do what you want.  A variable speed switch similar to a dimmer but made specifically to control motor loads may do what you want.  I think it would have to be installed after the 5-speed controller because the reduced voltage may cause problems for that controller.  Maybe you should just replace the controller with a the variable speed switch.

Feb 22, 2009 | Westinghouse 78127 Industrial Ceiling Fan

1 Answer

240v electric motor

Reducing the voltage is what you want to do -- this will effectively reduce the speed, without creating an annoying hum.

That said -- 110v is too low. Start higher. Half the voltage doesn't equal half the speed.

May 10, 2008 | Hampton Bay 24002 Ceiling Fan

1 Answer

Speed reduced suddenly

Try to check the fan first. Oftentimes, the speed variation is a manifestation that the fan has accumulated to much dust. Clean it. If the problem persist try replacing it. The lack of proper ventilation inside the machine could hamper its normal routine thus slowing down the system.

Apr 06, 2007 | HP Compaq Evo Notebook N800c PC Notebook

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