Carrier gas burner fan turn off and on few times before shut off for good

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Old 04-28-12, 02:12 PM
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Carrier gas burner fan turn off and on few times before shut off for good

I have a very old carrier gas furnace, don't know model#. Recently it has been acting very annoying, everything works properly i think, but when it riches set temperature then burner stops and fan stops shortly after but, fan immediately turning right back on for about 5-10 seconds, it does that twice before it shut off for good. I have changed fan limited switch and vent safety switch, both did not solve the problem. Can anyone give me some advice on this, i am afraid it will get worse if i don't fix it soon.
 
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Old 04-28-12, 02:20 PM
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Take the cover off the burner compartment of the furnace. Obtain the make and model of the furnace off the rating plate in the burner compartment and post it here.

Observe the sequence of events that occurs at the furnace when you turn up the thermostat and post that sequence of events in order and in detail.

Also, give a physical description of the part you replaced. The make and model of the fan limit would be good if you have it.
 
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Old 04-28-12, 02:30 PM
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LIMITED FAN SWITCH MODEL# HH12ZA260a. AND VENT SAFETY SWITCH MODEL# HH11AZ180. I WILL TRY TO POST THE REST AFTER I GET HOME TONIGHT.
tHANKS
 
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Old 04-28-12, 05:55 PM
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The model# is M58gs100-ca
150
Series# is 0589A03279

When i turned on the thermostat i see the pilot ignited then the burner lit up and fan motor turned on. i see nothing changed when i adjusted thermostat up, when thermostat adjusted down, the gas shut off from the burner and the fan motor shut off after.

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