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Old 12-19-2016, 06:41 PM  
madrussian
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Default Natural Gas Furnace - no heat

Got an Amana/Goodman natural gas furnace. Model CHPF1824A6AA, about 12 years old.

Has worked great until late last week. LED lights blink 3 times, indicating an induction air problem.

I checked the vacuum switch - infinite resistance when induction fan is off. When induction fan turns on goes to zero resistance. I think this is OK.

Checked limit switch, it being cold - is closed at zero resistance (not open) - i think this is OK.

I need to check the . But what else do I need to check?


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Old 12-20-2016, 07:28 AM  
madrussian
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I also tested the ignition element - giving me 50 ohms - so i am assuming this is OK?


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Old 12-20-2016, 08:27 AM  
Snoonyb
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The #CHPF1824A6AA, is for the "A" coil, not the furnace.
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Old 12-20-2016, 11:11 AM  
buffalo
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Does it fire at all? Check and make sure your exhaust and intake pipes are not blocked either by snow or pests .
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Old 12-20-2016, 11:29 AM  
madrussian
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Quote:
Originally Posted by buffalo View Post
Does it fire at all? Check and make sure your exhaust and intake pipes are not blocked either by snow or pests .
Nope does not fire. The induction fan turns on, vacuum switch closes, but nothing after that. Vacuum switch seems to operate properly but the thing does not fire up.
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Old 12-20-2016, 04:05 PM  
madrussian
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anyone know the order of operation? Should burner kick in next, then main blower turn on?

I am thinking main control board...
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Old 12-20-2016, 04:42 PM  
kok328
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what's your voltage on the HSI after the vacuum/pressure switch closes?
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Old 12-20-2016, 04:50 PM  
madrussian
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Quote:
Originally Posted by kok328 View Post
what's your voltage on the HSI after the vacuum/pressure switch closes?
HSI is the igniter? Should I unplug the igniter and measure voltage across those two leads?
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Old 12-20-2016, 05:28 PM  
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You didn't answer all of Buffalo's question.
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Old 12-20-2016, 06:24 PM  
kok328
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Quote:
Originally Posted by madrussian View Post
HSI is the igniter? Should I unplug the igniter and measure voltage across those two leads?
Your trying to determine voltage TO the inginiter so test the leads that connect to the igniter, not the leads on the igniter.
and of course you know not to touch the igniter with your fingers.
Inspect the igniter for hot spots and hairline cracks but, i think you already ohmed it out at 50



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