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Old 10-14-2013, 10:43 AM   #1
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Wife Freezing - need furnace help!


Have a 20 year old American Standard Freedom 78 gas furnace in basement. Worked fine last season - no issues. Turned on the other day and nothing happened but the 3 flashing lights (indicating pressure switch issue). Replaced the pressure switch and light signal went from 3 flashing lights to the signal for "call for heat", but then it switched back to the 3 flashing lights almost immediately. No heat, no fan, no gas, no nothing. Cleaned out pressure switch tubing just in case a bug got in it or it was blocked - but still nothing. Replaced ignitor and still nothing. Gas is turned on and circuit breaker is fine. Any clues what the issue can be?

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Old 10-14-2013, 10:56 AM   #2
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Wife Freezing - need furnace help!


when there is no call for heat is it showing the 3 flashing lights?

what does that code mean?

there are 2 codes - one for switch stuck closed which will prevent it from starting the other is for fail to close when the burner and exhaust fan starts.

where the tubing from it attaches to the exhaust fan or box remove it and poke a wire or paper clip or drill bit in that port to clear it.

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Old 10-14-2013, 11:16 AM   #3
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Hi - the red flashing lights first indicated a pressure switch issue. I replaced the pressure switch and then the red flashing lights stopped and the I believe it was yellow lights indicating a "call for heat" but nothing happened. Within a few seconds, the indication for a "call for heat" changed back to the red flashing lights.
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Old 10-14-2013, 11:27 AM   #4
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the sequence of operation is the thermostat turns on the exhaust fan which creates suction and closes the switch. if the exhaust fan is not running then the circuit board is bad or the fan is faulty. then it will show open switch code. those codes are on a sticker on the back of one of the doors or on the board or in the install/owners manual.
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Old 10-14-2013, 12:25 PM   #5
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Check your vent pipe to make sure there are no obstructions such as trash, bird's nest, etc. The inducer motor has to create enough pressure to close the contacts on the pressure switch. If there is something blocking the exhaust from the inducer it won't close those contacts.
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Old 10-14-2013, 01:28 PM   #6
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Wife Freezing - need furnace help!


I'll check the vent pipe when I get home, but I doubt if it's blocked since I have a screen over the chimney vent opening. If it's blocked, would that stop the fan from turning on?
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Old 10-14-2013, 03:33 PM   #7
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Wife Freezing - need furnace help!


You have a good wife....

Mine would have already called someone else- 3 days ago.
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Old 10-14-2013, 03:36 PM   #8
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Quote:
Originally Posted by Technow View Post
You have a good wife....

Mine would have already called someone else- 3 days ago.
yep you have a very good wife my would have replaced the furnace my herself:la ughing: ben sr
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Old 10-14-2013, 04:00 PM   #9
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Wife Freezing - need furnace help!


Quote:
I'll check the vent pipe when I get home, but I doubt if it's blocked since I have a screen over the chimney vent opening. If it's blocked, would that stop the fan from turning on?
Yes, a blocked or restricted exhaust/vent pipe will most definitely stop the inducer from creating a draft to close the pressure switch. The inducer will still start up on a call for heat but will shut down quickly if there is a restriction/blockage. A very common cause of blockage is bird's nests. You need to inspect the vent pipe the full length to make sure it is clear. Snow blocking the vent will also cause this problem. Don't forget to clean out the port on the inducer fan where the hose attaches.

Last edited by firedawgsatx; 10-14-2013 at 04:54 PM.
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Old 10-14-2013, 04:05 PM   #10
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Wife Freezing - need furnace help!


bockage would not stop fan from starting..blockage will cause exhaust blower to fail at opening the pressure switch which in turn will cause furnace to go into lock out after 3-tries..then flash code...ben sr
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Old 10-14-2013, 04:32 PM   #11
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Hard to say w/o being there but I make a lot of $$ off them sparrows going down the chimney and getting stuck in the exhaust fan. as many as 3 at a time I have pulled out in pieces and then take the shop vac to them. also had one stupid kamikaze red squirrel took a dive down one w/o a chimney cap. usually if there are trees nearby critters are a problem.
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Last edited by yuri; 10-14-2013 at 04:40 PM.
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Old 10-14-2013, 04:35 PM   #12
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Quote:
Originally Posted by ben's plumbing View Post
yep you have a very good wife my would have replaced the furnace my herself:la ughing: ben sr

Hope she does not have a SEERS card and collect them points. I am sure they could accommodate your new furnace needs that very afternoon.

Now what colors do they come in my gal would ask.

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Last edited by yuri; 10-14-2013 at 04:41 PM.
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