Furnace Problems


  #1  
Old 11-29-02, 03:53 PM
aspenglow
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Gas forced-air furnace

Our furnace and heat pump were installed in our new house in July, 2002. When installed by contractor, everything was working. A couple days ago when the temperature dropped low enough that the heat pump wouldn't furnish enough heat, the furnace wouldn't light. The flame sensor did not glow, we bought a new one and that was not the problem. The status light flashes continuously. There was no wiring changed or other work done since installation.

Furnace model #GMPN 120-5
Serial # 0105607142
 
  #2  
Old 11-29-02, 05:09 PM
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Hello aspenglow. Welcome to the Heating & Cooling forum & the Do-It-Yourself Web Site.

There is some confusion here which may need to be cleared up. Do you mean there are two seperate units? A heat pump and another unit for heating? Or would the two units be actually one unit?

The reason being is, a heat pump is all electric while a gas unit with air conditioning is gas for heating, has gas burners, and the air conditioning is all electric.

A heat pump heats using elecrical power and does not have gas supplied to it. If the unit does have burners & you already replaced a glowing hot surface ignitor, heater has to be gas fired. Which may indicate two units each as a seperate appliance.

If you have an owners manual it will explain what the flashing light indicates. Most likely the unit is in lockout mode. Be sure the filter access panel is correctly and properly installed.

Kindly use the reply button to add the requested additional information.

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An excellent source for orginal replacement parts is your local retail appliance parts store, the local heating dealers and agents retail part stores. Bring the make, model and serial numbers. The info will help to determine the possible problem causes.

Heating Agents & Appliance part stores carry replacement parts for almost every heater brand. The locations for the dealers, agents and retail part stores are listed in the phone book.

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  #3  
Old 11-29-02, 05:42 PM
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aspenglow,

sounds like the contractor did not start up the heat, he should come out and make it right. model # sounds like a goodman, low end unit, high capacity, though. you say the flame sensor did not glow, and you replaced it. do you mean the hot surface ignitor? it should glow as long as voltage (120) in this case, is present. if the sequence of operation is correct, inducer fan comes on, pulls in pressure switch, board sends power to ignitor, valve opens, flame sensor detects flame, unit runs. if ignitor does not glow, may be pressure switch or board. this unit is under warranty, and requires a dual fuel board. call the installer.
 
  #4  
Old 11-29-02, 05:48 PM
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HEAT PUMP

Hey get the guy that put this job in. He should have to back it for a year parts and labor. We put heat pumps on gas furnaces for back up. But i will say most of the time it is with back up electric strips for heat ED
 
  #5  
Old 11-29-02, 06:05 PM
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we call it

dual fuel here in georgia, fairly common for a heat pump to be piggybacked on a gas furnace. i know carrier has the high dollar dual fuel thermidistat that will operate this system correctly, but taking in to consideration o/d temp, plenum temp, etc. other than this i have used what we call a "bill porter" board. very simple to wire, but still bottom line, WARRANTY!!!! oh yeah, did you "backdoor" it and do it yourself, or have a hvac guy do it on the side? if so, warranty may be void, but we can still help pinpoint the problem. try emergency heat at the tstat. does the furnace fire then?
 
  #6  
Old 11-30-02, 06:36 AM
aspenglow
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Yes, it's a Goodman, and electric heat pump is piggybacked to natural gas furnace. Installer checked and showed us sequence of operation all worked correctly, including flame igniting. Could it be a loose connection somewhere? The book that came with the furnace says the continuously-blinking red light could indicate the polarity of the power source is reversed, but in that case it wouldn't have worked the first time, would it?

We have tried, but been unable to contact installer. I hope he didn't go on vacation.
 
  #7  
Old 11-30-02, 08:19 AM
bigjohn
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Polarity and Grounding are very important on furnaces with electronic boards. Has any wiring been done in your house since the installation? In the furnace, the hot wire has to go to the hot wire terminal and nuetral has to go to the nuetral terminal.
 
  #8  
Old 11-30-02, 02:17 PM
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tools for the job.......

You'll need a meter to determine if this is the problem. one lead to ground and the other to the hot wire=120VAC, one lead to ground and the other to the white wire=0.0 VAC.
 
  #9  
Old 11-30-02, 02:20 PM
H
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heat call,

with nothing happening...It sounds like the unit doesn't know there is a call for heat. Whatever switches this over to the furnace isn't doing it. This may have been an outdoor sensor you hit with the weedeater....just a thought
 
  #10  
Old 12-02-02, 12:30 PM
aspenglow
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Thanks guys for all of your advice. The installer came down on Sunday afternoon and found that the furnace control board was bad. It has been replaced and the furnace is running now.
 
  #11  
Old 11-30-14, 05:46 PM
L
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I have a 2007 Goodman furnace 120-5d. The main blower comes on after the venter blower is energized then the burner ignites out of sequence. Then it finishes it cycle. Help!!!
 
 

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