Goodman GMPN 120-5 / HSI no glow


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Old 09-26-11, 07:21 PM
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Goodman GMPN 120-5 / HSI no glow

Hiya Folks,
I have a Goodman 120-5 condensing gas furnace that the hot surface ignitor refuses to glow.

A little background on furnace... every year the exhaust blower would be seized and needed freeing up. And the hose from the exhaust blower to the pressure switch would fill with water and need blowing out about twice a season. Otherwise it has worked fine. Until now.

This year the furnace is the X-wifes and she could not free up the exhaust blower and wound up replacing it... only to find the HSI is not glowing. I had a spare laying around for just such an emergency which I had her install. The exhaust blower spins but still no glow.

I downloaded a manual which is of little use and I cannot think of what to tell her (over the phone) what to do next.

Vent pressure switch?
Condensate drain box (thingy?)

Thx in advance,
Alan
 
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Old 09-26-11, 07:41 PM
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What does the blinking LED indicate?
 
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Old 09-26-11, 07:48 PM
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She says there is no blinking LED since she replaced the exhaust blower.
 
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Old 09-26-11, 08:06 PM
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Is the LED on or not visible?
 
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Old 09-26-11, 08:11 PM
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http://www.alltemp-hvac.com/gmpn.pdf

If you have no LED the blower door interlock switch may not be depressed.
 
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Old 09-26-11, 08:21 PM
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The light is on "solid red"
 
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Old 09-26-11, 08:25 PM
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Is a white wire connected to the W terminal at the furnace?
Is a red wire connected to the R terminal at the furnace?
Does the fan run when fan is set to On at the stat?
 
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Old 09-26-11, 08:47 PM
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yes, yes, and yes. The wires are were they are supposed to be and the circulation fan runs
 
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Old 09-26-11, 09:15 PM
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We need to place a jumper wire between the R and W terminals at the furnace.
 
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Old 09-26-11, 09:21 PM
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she now says that the LED shows 3 blinks (failure to close)

i will see if she has a way to jumper the R/W terminals.
 
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Old 09-26-11, 09:26 PM
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We may no longer require this jumper.

Did the induced draft motor ever run?
 

Last edited by Houston204; 09-26-11 at 09:43 PM.
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Old 09-26-11, 09:43 PM
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she says yes.
she also goes on to say that she removed the pressure switch wires and crossed them. The power vent worked and the ignitor glowed, but the gas did not turn on. No flame.

Alright... We gotta hit the sack. Plz leave your next instruction and we'll pick it up tomorrow night

Thx for you time,
Alan
 

Last edited by miner49r; 09-26-11 at 10:04 PM.
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Old 09-27-11, 04:52 AM
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Did we ever hear a click after the ignitor energized?
We don't have pressure switches bypassed,do we?
 
 

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