Day&Night blower not working

I have a circa 1992 Day&Night downflow gas furnace with A/C cooler added on. Recently the blower stopped running. The A/C compressor runs, but the blower will not move the cool air. Setting the thermostat fan from AUTO to ON results in a relay clicking noise in the furnace. I checked all the house circuit breakers and furnace circuit board in-line fuses. The blower squirrel cage moves easily by hand, so it is not jammed. I checked that the over-temp limit switch is reset. I had a service person in to look and he stated that there was no voltage going to the blower. He would do a circit board replace for $420. I said give some time to decide.
Does this seem reasonable? Is this a fair price? Is there something else anyone can suggest?
Thanks
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Phil wrote:

most cent. a/c units have a box(on/off switch in the attic where the blower is located.. if it is in the off position or in some cases the oil/grease inside will melt down and insulate the contacts and you get no voltage to the a/c blower in the attic.... did the a/c guy check to see if there was voltage going to the who unit?? if not or in doubt get up there and check for yourself....
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jim wrote:

This is an A/C add-on to the Day&Night. The chiller coils are mounted just below the "down-flow" furnace in the central closet (this is California, no attic, no basement :) ). I can hear/see the A/C compressor/fan running outside. I can feel (hand on pipe) the cold working fluid enter the in-house coils below the furnace.
The furnace blower is used to circulate the chilled air throughout the house. That is what is not working.
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More than likely your the problem! The AC condenser is controlled through the furnace, if the AC condenser is running, the furnace has power to it. Greg
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Sounds reasonable to me. I just replaced one the other day, fairly common problem in my book. As far as the price, it is about what I charged for the repair. Greg
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