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#1
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HVAC blower weirdness
"Tony Hwang" wrote Hi, Blower control lead from 'stat is same for heat or cool. Not necessarily. There's not nearly enough information here to make that call. Many furnaces use the thermostat and subbase to "call" the blower in AC mode, yet the blower is called directly by bonnet temperature in heating mode. First you have to see if G lead from 'stat is enabled when it acts up. From there you move to control board inside furnace. You didn't mention what kinda furnace. Any way in cool mode blower runs at higher speed. You don't know that it has a board, or thet it runs at a different speed for AC either. It may be just a fan center relay. Can't really tell without more information. I could make many guesses, such as motor, cap, wiring issue, board, fan center, weak disconnect, etc. etc., but they would be just that, guesses. He should probably call a guy in to look at it, unless he wants to just follow his own steps 1) through 4). :-) Sorry, Lefty |
#2
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HVAC blower weirdness
Lefty wrote:
"Tony wrote Hi, Blower control lead from 'stat is same for heat or cool. Not necessarily. There's not nearly enough information here to make that call. Many furnaces use the thermostat and subbase to "call" the blower in AC mode, yet the blower is called directly by bonnet temperature in heating mode. First you have to see if G lead from 'stat is enabled when it acts up. From there you move to control board inside furnace. You didn't mention what kinda furnace. Any way in cool mode blower runs at higher speed. You don't know that it has a board, or thet it runs at a different speed for AC either. It may be just a fan center relay. Can't really tell without more information. I could make many guesses, such as motor, cap, wiring issue, board, fan center, weak disconnect, etc. etc., but they would be just that, guesses. He should probably call a guy in to look at it, unless he wants to just follow his own steps 1) through 4). :-) Sorry, Lefty Hmmm, Still my logical approach is sound. Another lefty. |
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