Fan continues to blow...

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Old 03-13-04, 02:48 PM
Texascj101
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Angry Fan continues to blow...

I have an older Bryant central heater that has had upgrades. Last night the fan motor came on & will not go off! Not even with the t-stat turned to off & auto! Tried turning t-stat to lowest setting & setting back to heat, didn't turn off. HELP!
 
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Old 03-13-04, 03:56 PM
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Read B 4 U post ::::::Need info info here so we can help. Just how old ? doest it have a fan limit control and its stuck a relay and its stuck on. Take and hit the side of the furnace real hard with your hand. See it that turn it off. Is the filter clean. Some time when it starts to get warm out and the furnace still runs some the blower will stay on some times also Check fan control and see if you can set the off temp up a little.

old with upgrades???????????????? ED
 
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Old 03-14-04, 05:59 AM
Texascj101
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Arrow 1963

Hi Ed! Was originally installed in 1963, huge dinosaur of a furnace for a huge house. A few years ago had all the gas lines replaced, last year had all the pilot mechanisms that are outside the furnace replaced. Have also replaced the blower motor. I went in & hit the fan limit control & guess the relays were stuck. If it continues I will replace that also. Thanks!
 
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Old 03-14-04, 06:59 AM
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That old should have a fan limit control . Pull cover off hold dial and move "off "pointer up a little. Can try this first. If you have AC on here then there is a relay in it but this would click when you push fan on at the tstat ED
 
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Old 03-14-04, 08:38 PM
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Hello: Texascj101

That smack on the furnace is exactly what the furnace needed to deactivate the stuck contacts in the fan switch. Done it hundreds of times myself as a tech over the years.

The smack created a jolt which disconnected the stuck contacts. To resolve the problem turn off the electrical power. Remove the wires attached to the control and note which wire goes to which terminal.

Remove the fa temp control and replace it with another new one. Reconnect all wires as previously found, turn electrical power on. Problem should be solved.

Be aware that the fan on temp control may not be available. A replacement for it may be a time delay relay. (TDR) Which means the TDR is not heat sensitive as the current one is. Instead, it turns on based on time as well as time to turn off.

These devices (TDR's) replace old style fan on/off control. Can be purchased in differant values of time on and time off amounts. 2 minutes till turn on time and 3-4 off time should be fine.

On time refers to time after T-Stat is activated and 3-4 minutes off time is after T-Stat shuts down. Heating parts dealers will know what a TDR is as a replacement for current fan on/off limit control currently used on the heater.
 
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Old 03-15-04, 03:53 AM
Texascj101
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Thumbs up Thanks~!!!!

Thank you both for the pointers. You have been a life saver!
 
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