Armstrong Air Ultra V won’t start

______________________________________________________________________ Hi, I have a Armstrong Air Ultra V – Tech 80 furnace with a Honeywell Smartvalve II SV9520H which doesn’t start. Here are the details about the problem: 1. When the thermostat is on the OFF position, the led indicating the status is showing the normal function “heartbeat” 2. Turn the heat on the thermostat (80 F) and set the thermostat to AUTO – nothing happens, the furnace won’t kick off. 3. Set the thermostat switch to ON – the blower kicks off but the gas won’t light. After about 20-30 seconds, the status led starts flashing 3 times which means: “Presure switch open. Should be closed”. NOTE: The gas is on and the furnace turned on from the main switch. Any idea of what might be wrong with the furnace and how can I solve the problem? Thanks, ne@ Replies: Zzz “Re(1):Armstrong Air Ultra V won’t start” , posted Sun 26 Nov 13:45 ______________________________________________________________________ If you take a piece of wire and jump the terminals on the switch it will tell ya if your on track everything will work. I find a lot of times with these pile “O” junk smart valves if you wiggle the wire on the valve it will run maybe only for a sec but that tells ya the valve is pooched. moondog “Re(1):Armstrong Air Ultra V won’t start” , posted Wed 22 Nov 00:14 ______________________________________________________________________ Are you confused about the thermostat switch–AUTO & ON? They refer to the main blower motor. Auto: blower comes on automatically after a call for heat or cool, while ON powers the blower motor from the tstat regardless of a call for heat or cool. If such a call occurs, the blower is already on steady and will remain on untile set to auto or there is no power to the motor. Pressure switch open means that voltage is not going thru it and therefore the main module does not allow the burners to light. Find it, ohm it out if in doubt as to whether it is closed or not. probably you need to clean out the tube and or nipple on the inducer motor housing so that negative pressure can close the micro switch in the pressure switch. Thermostat (thur me-stat’) The 1st thing a HomeOwner suspects is wrong which is usually wrong thinking on their part. If in doubt jump it out. ne@ “Re(2):Armstrong Air Ultra V won’t start” , posted Wed 22 Nov 09:29 ______________________________________________________________________ quote: ______________________________________________________________________ Are you confused about the thermostat switch–AUTO & ON?They refer to the main blower motor. Auto: blower comes on automatically after a call for heat or cool, while ON powers the blower motor from … ______________________________________________________________________ So, all the problems come from the pressure switch……If I fix/replace this everything should be ok, right? Which one the pressure switch though? The one looking like a hockey puck, right below the blower and having a tube connected to the blower? So, I take this out, take it apart and try to clean it? Thanks ne@ moondog “Re(3):Armstrong Air Ultra V won’t start” , posted Fri 24 Nov 06:06 ______________________________________________________________________ probably you need to clean out the tube and or nipple on the inducer motor housing so that negative pressure can close the micro switch in the pressure switch. The turning of the inducer motor fan inside of the housing forces air up your chimney. The hose connected to the pressure switch ‘pulls’ a micro switch closed due to the suction created by the fan. I suggest a professional tuneup of your unit so that a tech can describe other parts of your furnace and how they operate. Thermostat (thur me-stat’) The 1st thing a HomeOwner suspects is wrong which is usually wrong thinking on their part. If in doubt jump it out. ne@ “Re(4):Armstrong Air Ultra V won’t start” , posted Tue 28 Nov 09:47: ______________________________________________________________________ I finally got the chance to take a look at the furnace. I took out the hose from the presure switch an clean it. As I sucked on the presure switch hose I can hear it closing, so this one works. I just realize that the problem is with the inducer motor fan: It won’t start. When I set the thermostat to ON I hear the furnace starting, and I thought it’s the blower, but no, I hear the noise in the bottom part of the furnace. THE TOP BLOWER WON’T START. What should I check to see what the problem is? Thanks, ne@ ne@ [this message was edited by ne@ on Fri 1 Dec 09:54] ne@ “Re(5):Armstrong Air Ultra V won’t start” , posted Tue 5 Dec 11:17: ______________________________________________________________________ guys, any idea about the inducer mototr fan? What should I check to see why it’s not starting? Please give me a hint, I’m freasing inside the house. Thanks, ne@ [this message was edited by ne@ on Tue 5 Dec 11:17] ne@ “Re(6):Armstrong Air Ultra V won’t start” , posted Mon 11 Dec 11:11 ______________________________________________________________________ I made some measurements this week-end and this is what I found: – the thermostat looks to be working properly. I replaced it with a new one and the problem is still there. – I measured the power, and it looks like the power from gas valve to the inducer blower is out. On the 4 wire connector for the inducer blower on the valve I cat power on the input pins into the valve, but no power on the output pins. So the valve never sends power to the blower. Do you think it can be fixed or I have to replace the valve? If I have to replace it, do you know where can I buy one? Thanks, ne@

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