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20 year old gas furnace with hsi. I have replaced the draft inducer, control unit and the gas valve. The hsi is working but the gas valve does not open or opens only one in twenty tries. There is 26v coming from the transformer. With the demand for heat, it cycles through it's 3 or so tries but the gas valve doesn't open.

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  • laura Newman May 28, 2010

    Does it open long enough to try to light?....like for approx 5 seconds and then shuts off?

  • Brian Niten May 28, 2010

    Does it have an air pressure switch?

  • esteban8 May 29, 2010

    yes, it is working.

  • esteban8 May 29, 2010

    no.

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Test for voltage and an amp draw on the gas valve while it should be energized, see if the power(24volts) is present and if so any amp draw, an amp deaw says its trying to work,

Posted on May 29, 2010

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Need to find a replacement part


Here you go Angela

1149097 Draft Inducer Assembly - AllParts Heating

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Furnace draft inducer assembly. The draft inducer motor draws air into the burner and exhausts it out the flue. If the draft inducer motor is defective, the furnace ...

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Nov 27, 2016 | Heating & Cooling

1 Answer

Furnace wont work


Have to know the model and serial of the furnace.
locate code list usually inside or on the back of a door.
Operation sequence= call for heat--inducer blower motor--makes pressure switch--signals board to bring on hsi--after a set time gas valve opens and you have ignition--main blower motor comes on after a set time

Feb 14, 2014 | Coleman 7990-319p Evcon Gas Furnace...

1 Answer

I have a Trane gas furnace with White Rodgers 50A50-474 board is flashing a 2 flash code which is a system lockout-no flame/Check line polarity message. The furnace blower contines to run, but the gas...


Sounds like your ignitor is bad, not lighting the gas. If this happens 3x, then controler goes into lockout and induced draft motor continues to run to extract the gas fumes as a safety.
Either replace the HSI (Hot Surface Ignitor) or sand down the end of the electronic spark ignitor and it's ground rod (they work like an exposed spark plug) to remove the carbon buildup on it so it can spark again. All with the power off, of course!
If you need more help, please ask, I'm glad to help! 25 year HVAC service Tech- residential & commercial systems.

Apr 05, 2013 | Heating & Cooling

2 Answers

Goodman 95 %furnace keeps saying low pressure is stuck. changed out low pressure switch and high pressure switch and still have same problem.


That thang might be sensing a lazy flame. In other words the flames took too long in the board's opinion to quit sensing the flame. Yall probably need to do pressure tap on the gas valve.
Here is a realistic look at goodman fault codes and what to check fer and I am assuming you are not a tech and don't know this already and am hoping it helps:


Read one LED flash that stays on continuously to mean your furnace has no signal coming from the thermostat and will not operate. Turn the power off and check the thermostat for improper settings or connections.

Interpret one LED flash that blinks on and off to mean your furnace has locked out because it could not ignite after three tries, and must be reset. Interrupt power to your furnace for 20 seconds or lower the thermostat so your furnace does not try to heat, then reset the thermostat to the previous setting. After one hour of lockout, your furnace will automatically reset itself and try to operate as usual.

Decipher two LED flashes to mean the draft blower is not working, or your furnace has a short in the pressure switch circuit. Turn off the furnace power and repair a short or replace the pressure switch.


Read three LED flashes to mean your furnace has an open pressure switch circuit or it has an induced draft blower operating. Check the pressure switch hose of your furnace for blocks or an improper connection. Also, look for blockages in the flue, and tighten any loose wiring.

Translate four LED flashes to mean your furnace has a primary limit circuit open, possibly from loose wiring or blocked filters. Check and clean filters, tighten wiring and check the flue for blockages.

Interpret five LED flashes to mean your furnace senses a flame without a call for heat. This could be from a gas valve closing slowly or a burner flame lingering.



Read seven LED flashes as a warning of a low flame sense microamp signal. This could happen with a coated flame sensor or a lazy flame from poor gas pressure. Turn off the power and adjust the gas pressure according to the information on the rating plate.



See eight LED flashes as meaning an igniter circuit problem due to a bad igniter or an igniter connected improperly. Replace the bad igniter or check the ground wiring, making necessary corrections.



Decipher nine LED flashes to mean the high-stage pressure switch circuit will not close during a high-stage-induced draft blower operation. Your furnace may have a pinched or blocked pressure switch hose, a blocked flue or loose wiring.

Read continuous flashing on the LED to mean your furnace has a reversed polarity of 115 volts. Turn off the power and correct the wiring polarity after reviewing the wiring diagram.

Now here is how it should all go down:



Bottom dollar: it all goes back to type of gas, the initial setup, the pressure tap. and how it is wired up to begin with.
This will give you an idea where to start I hope.

Dec 10, 2010 | Goodman GMS80903BNA Heater

2 Answers

Turns on but no heat


From what I saw when I googled you furnace it has a hot surface igniter. It only gets hot when it's time to light the furnace. You should be able to see it glowing red when the furnace is trying to light. The furnace has a safety feature which shuts the gas valve when it doesn't detect a flame to prevent gas build up in the furnace. There are other safety features also. If the draft inducer motor isn't running the gas valve won't open. Overheat switches some of which have to be reset manually. Adjust the thermostat until it calls for heat then observe what is or isn't happening in the furnace. It will go thru a purge cycle first. The draft inducer motor will run to do this. After the purge the hot surface igniter should get hot a glow, then the gas valve will open and the burner will light. Let me know what you find.

May 04, 2010 | Goodman GMS90703BXA Heater

2 Answers

Gas Furnace will not start when outside temperature rises to 50F


There is a pressure switch near your draft inducer motor that needs to close when draft inducer motor is running. Verify that the switch is closing. If it is not closing, you might have a problem with either the switch itself, or there could be some sort of blockage in your flue. I would start with the switch first. This switch has to "prove" before it will allow anything else to happen. The loud click could be from your switch or your gas valve. If the switch is closing and nothing else is happening, it could be a problem with your gas valve or HSI.

Mar 12, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

2 Answers

Janitrol/Goodman GMP075-3 Draft Inducer Fan Won't come on


most forced draft fans are powered by 120 volts . close to the fan is usually a plug that unsnaps. create a call for heat after turning off to clear safetys and see if your getting 120 to fan on initial call for heat. if you are then fan draft motor is bad, usually sold as an entire assembly replace exact as it came out. sequence of operation is..... stat calls for heat via common and white wire to furnace , 24 volts. ......board sences call and sends 120 volts to forced draft ........ motor runs and creates pressure on proofing switch,....... switch closes 24 to board and tells it draft fan is on......... board then energizes ignitor,....... after ignitior glows gas valve is opened and burner lights ........ either ignitor or seperate sensor rod tells board the burner lit........ and a few minutes later the fan comes on and hot air is blown out. if a step is missed or doesn't proof the furnace either trys up to three times to light or locks out. turning off power usually resets safetys and it will resume attempts to lite normally.

Oct 25, 2008 | Heating & Cooling

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