Code 33 on Day & Night Plus 80

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Old 01-03-07, 06:46 AM
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Code 33 on Day & Night Plus 80

My Day & Night Plus 80 about 11 years old is just blowing air...no heat. A red led is flashing 3 times fast and 3 times slow which probably means a 33? The fan has been blowing all night without heating. I've changed the filter, tried resetting the furnace according to the front panel. Any suggestions?
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Old 01-03-07, 02:35 PM
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Originally Posted by Turbojohn View Post
My Day & Night Plus 80 about 11 years old is just blowing air...no heat. A red led is flashing 3 times fast and 3 times slow which probably means a 33? The fan has been blowing all night without heating. I've changed the filter, tried resetting the furnace according to the front panel. Any suggestions?
Thanks
Check for plugged evaporator coils. I just had the technician from a local
company out here last night and he fixed my Bryant Plus 80. He found the
coils were so plugged that the safety limit for the Heat Exchanger was tripping and shutting off the system. I just spent an hour inside the coil
case cleaning off the rest of the coils but there are some spots my arms
are too big to reach. Code 33 means a limit has been opened. There are
several limits including the Flame Rollout Switch, the Flue Temperature switch,
a pressure switch and the Heat Exchanger temp switch. The flue temp and
flame rollouts are manual resets, the others reset themselves when the system
cools.


Christopher
 
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Old 01-03-07, 05:47 PM
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Limit Switch

THanks for the tip. I took the limit switch out and smacked it on something hard
to re-set it. This was the only way I could get the furnace to come back on.
I'll check the coils.
 
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