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Old 12-19-2010, 01:21 PM   #1
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Electric furnance blower shuts off.


I have an Armstrong furnace with a heat pump, that is about 3 years old. The model number on the inside unit is EC1P36BG-1.

Our stopped working last night. You can run the heat and everything runs fine for about 5 minutes then the blower shuts off. If you turn it off and then back on it won't start, but if you wait 15 minutes it will start again.

When it does turn on starts the emergency heat because it is so cold. The internal emergency coils heat up and the blower comes on. Then the heat pump turns on and heats up. It will run for a few more minutes and the blower will turn off. After the blower turns off the heat pump will continue to run.

Any ideas?

Thanks,
Martin

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Old 12-19-2010, 01:45 PM   #2
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Electric furnance blower shuts off.


Could be the motor is over heating. Or a control issue.

What have you checked so far.

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Old 12-19-2010, 02:22 PM   #3
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Electric furnance blower shuts off.


Put your hand on the motor when it stops. Should be able to hold it on and not fry an egg on it. Try spin it to see if it is seizing up at that time.
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Old 12-19-2010, 02:24 PM   #4
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Electric furnance blower shuts off.


The squirrel spins freely and quietly. When blower starts it has about 5.6V on the Yellow and Blue wire. Then goes down to about 4.2V and stays there until it shuts off. Then end of the blower motor never gets to warm but the side get hot, you can only hold your hand on it for a second or two. There is a coil on the side of the squirrel cage that has 1.8V on both wires.

I also checked all of the conectors and crimped some that seemed a little loose.
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Old 12-19-2010, 02:29 PM   #5
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Electric furnance blower shuts off.


You don't have to measure voltages across those wires as they are the 3-4 different motors speeds and return to the same neutral and you are getting false readings/backfeed. The coil or silver jobby is a capacitor and may be weak. Should have a mfd rating ie 5/370 or 7.5 or 10. If your meter has a capacitor tester then discharge it and test it otherwise replace it. Sounds like the motor is overheating and cutting out on its internal heat overload. If you want to check voltage to the motor follow those wires to the circuit board and see which one is the heat terminal. Remove the wire and then check the voltage on that terminal, should be 110-120 volts.
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Old 12-19-2010, 03:43 PM   #6
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Electric furnance blower shuts off.


The motor does get hotter than I thought. You can't even touch it for one second, but it still spins freely.

My meter does not have a capacitor tester, so I can not test it. I do not have a circuit board with labeled connectors. I have a Blower Relay, Transformer and Time Delay. Only the blue and yellow wires from the blower are connected.
The blue - goes into the Blower Relay from there 2 wires go to the transformer 2 to a sequencer and one to the time delay.
The yellow - goes into the transformer and time delay. Transformer goes to circuit breaker sequencer and heater element.





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Old 12-19-2010, 03:54 PM   #7
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Electric furnance blower shuts off.


You should have 240 volts across Blue and Yellow but we are now dealing with some VERY high voltages and amperage so you need to be real safe if you have not worked on these units before or with high voltages. Better to pay a Pro than save a few $$ and make your wife a widow. Hopefully your meter is working PROPERLY.
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Old 12-19-2010, 03:56 PM   #8
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Electric furnance blower shuts off.


Sounds like a plan. Thanks
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Old 12-19-2010, 04:00 PM   #9
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Electric furnance blower shuts off.


Glad to hear you will be safe. $$ ain't worth dyin over and you can't take em with you.
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Old 12-21-2010, 03:27 PM   #10
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Electric furnance blower shuts off.


I ended up taking out the blower assembly and taking it to a local hvac shop, owyhee sheet metal. They were great they bench tested the motor for nothing and it was good. It was a bad cap for $9.99, cheap fix. I think the cap always had a leak, because the blower never really blew very good. The blower is running at about twice the RPM's, running cooler and putting out twice the air. This should also help our electric bill. Thanks for the help Yuri and Beenthere.

Thanks,
Martin
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Old 12-21-2010, 03:34 PM   #11
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Electric furnance blower shuts off.


I used to get LOTS of Owies until I started using cut proof gloves while tin bashing.
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Old 12-21-2010, 03:43 PM   #12
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Electric furnance blower shuts off.


Only got one cut while carrying the squirrel cage into the shop. Had my gloves, but they don't do much good on the floor board of the car.

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