I had the same problem with my fan and solved it with a reset. The reset button is on the back of the remote next to the dip switches. You have to take the battery cover off to see it.
Turn on the fan with heat, even though the heat doesn't work. Then, leaving the remote on, turn off the fan at the wall switch (or circuit breaker box). Wait a few minutes. Then turn on the power and within 30 seconds, press the reset button. You should be able to see a countdown from 5 to 0 on the remote screen.
Once I did this the heat started working again.
To troubleshoot this types of problem,click the link below
:----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the
issue.
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Engine Overheats and heater
blowing cold?
http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
---------
Heat blows cold on drivers
side and hot on passenger side?
http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html
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No heat on car?
http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html
------------
Heater blows intermittently and temp
gauge goes erratic?
http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html------------Heater blows cold?
http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html
---------Car heater blowing warm, but not
hot air?
http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html--------
Heater/AC blower motor not working?
http://technoanswers.blogspot.in/2012/02/heaterac-blower-motor-not-working-on.html
------------
A/C, heater, defroster fan, not
working?
http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html
Heater problem?
http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html---------
This will help.Thanks.
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