I would call Vornado at 1-800-234-0604. They have great customer service- and usually have really good warranties with their products. I bet they can get you figured out. Any time I have had any questions, they have been very helpful. Vornado is also on Twitter, by the way - so if you "tweet" then some people ask questions via twitter too. I have always had good luck with their fans...
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Sounds like something in the control module. I have 2. One bought used about a year old. Lasted about 3 months and something in the control module or panel died so would not light or power up. I hard wired the blower and Infrared bulbs to manual switches so I can manually turn on and off heat. Have separate switches so can leave the fan blowing after turning off the elements to allow them to cool. The other heater was bought new and laster about a year and a half. Then the thermostat reading worked and fan worked cycling as should but elements would not light. Did a factory reset holding power button while plugging in. That fixed it for a day then back to same. took back off and while trying to trouble shoot voltages on the power supply module the elements started working again. Not sure what the issue but seems to be a definite issue with short lived control modules. To date have not found a resource to buy new control boards or other replacement parts besides bulbs which with the fans seem to be the most durable part of the whole heater.
This could be water in the hoses that connect to the pressure switch , they should just pull off and blow then out also blow out the pressure switch , this sound like a moisture problem with all the bad weather you h, check air filter is not blocked .
There maybe a few issues. They have multiple safeties on furnaces. With this in mind this process to find the problem would take a Technician to check these safeties. It could be a flame sensor or thermocoupler each senses a flame or heat to keep the gas going. Also the damper for the flue must open for the gas to stay on. There may be more safeties on this and each safety sends a 24 volt current back to control module in order for the gas valve to stay open. If these aren't being met it will try around three times and go into a lock out mode which will keep gas shut off entirely.
If the flame looks good prior to the room air blower starting but becomes unstable when the blower starts, you have a crack or hole in the heat exchanger. I strongly suggest your technician do a test on it to see.
The short is on the 24V side...I would put a 3 amp fuse in series with the Hot 24v line before it gets to the circuit board from the transformer you will have to replace again....have a few spare fuses....after having done that./...turn the power on and call for heat...Observe what happens and what stage of the cycle you're in when the fuse blows...Exhaust fan starts...Ignitor starts to warn up....etc...I need more info...shorts are hard enough to find as it is.......does it blow the fuse immediately...usually it will go through a few stages before you get to the problem piece....Make and Model of the furnace could also be helpful to me
The Furnace went to safe mode. One of the relays are out or the gas
valve. Open the furnace up turn it on the heat. The power switch
needs to be on. Newer furnace have a control board that tells you
the problem. Look at the back of the door for the service code and the
Is this furnace standing pilot or electronic ignition. If standing pilot i would check furnace filter then the thermastat. To test themostat first turn power off to furnace. Take thermostat off wall and take wires labled R & W and connect them together. If you have electronic ignition I would start with cleaning the flame sensor with steel wool or wire brush.If you have and more questions i will be glad to help.