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What is the output voltage supposed to be going to the hot surface ignitor ? mod# GSU080-4 I replaced one(appeared to be bad),the unit fired one time and then nothing.After further checking,I found I only have around 75 volts.

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Hello,Your HSI power input is 110v.If you set your meter to conuinty(ohms) setting you should get any reading(unplug it) to see it's good.NEVER touch the element ever as fingerprints will shorten the life of the ignitor.

Posted on Oct 06, 2010

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Heater will not ignite


  1. Do you have a standing pilot style heater = Milivolt
  2. or is it an IID = Spark style ignitor
  3. Or... Hot surface Ignitor = glows red hot like an auto cigarette lighter?

Most common problem I have come across over the last few weeks, is pressure switch not closing, meaning - dirty filter. Try cleaning your filter: backwash or rinse cartridges.

  1. is pilot staying on, and burning well?
    1. If so, is htr's gas valve in ON position?
  2. Do you hear sparking?
    1. If No, then one of the safety switches is keeping heater from firing...
      1. Toggle switch - on/off
      2. Thermostat - turned up high?
      3. Pressure switch - closes circuit when pump comes on
      4. 2 each high limits
      5. Fusible link / roll out switch
    2. If yes, either gas valve is off, is bad or the Ignition module is bad? Some call it grey box.
      1. You will need to test for voltage at the common and MV posts of the gas valve - 24 to 28 volts. If voltage = bad gas valve; if no voltage = bad IID Module (Intermittent Ignition Device)
  3. Do you see a bright red glow in the burner tray area?
    1. If yes, either fuel supply is off, or Ignitor has worn out and the glow is not hot enough to ignite raw fuel.
    2. If no, check voltage at Ignitor - depends on make and model of heater- could be as low as 24 volts and as much as 110 volts. So... No voltage at the supply wires = bad sending component, again depend on brand and model, could be ignition module, could be circuit board?
    3. If yes voltage, bad Ignitor
      1. Again, this is if fuel supply is confirmed.
Good Luck

May 08, 2015 | Teledyne Laars Laars Lite 2 Pool Heater...

1 Answer

MY carrier model #58DHC with hot surface ignitor has quit working. Blower works, but no heat. If you turn the thermostat to on fan will run but no heat. Did preliminary testings with self test on printed...


If you suspect its the ignitor? The hot surface ignitor is powered by 120v. Inspect ignitors' hot surface for cracks or burnt spots. Uplug ignitor from board. Cycle heat on and verify 120v to the ignitor at the cannon plug on the board where the ignitor plugs in. If you have the voltage then replace the ignitor. If not, you'll need to verify all other circuits are working before condemning the board. Work safe and at your own risk! Hope this helps!

Mar 25, 2017 | Heating & Cooling

1 Answer

My gas blows out but igniter doesnt glow orange.


COMMON PROBLEM THE UNIT MAY HAVE A BAD HOT SURFACE IGNITOR .... these often go bad... if you have avolt meter unplug the ignitor and turn heater on see if you are getting 120 volts to ignitor plug...if so then the ignitor is bad and needs replaced....

Jan 02, 2011 | Goodman GMS81405DNA Open Flame Mid-Size...

1 Answer

Dryer starts hot surface ignitor comes on gas valve opens i get a flame 5 mins flame shuts off hot surface ignitor repeats and tries to ignite no flame after unit is off for 20 mins to 30 mins off unit...


Hi, If you are having problems with your gas dryer not heatingthe most common problem is that the ignitor goes bad. Even though it glowssometimes it is still not working properly. if you dryer is gas check out this gas no heat tip.... If you have an electric dryer, you can have many differentthings that can go wrong causing the dryer not to heat. check out this electric no heat tip...

heatman101

Sep 17, 2010 | Kenmore 77632 Gas Dryer

3 Answers

I have a Raypak 147CHL boiler used for our house's slab heating. Started up this season 2 weeks ago but 2 days ago went off. Now it won't restart. Tried turning off & restart several times but no...


Check to see if there is voltage going to the Hot Surface Ignitor when you first try to fire it up. If you have voltage but it fails to glow, the hot surface ignitor has failed and will need to be replaced.
Also ensure you have proper flow through your boiler......make sure you have water flowing through the boiler and, if there is a flow switch, check the voltage across the two terminals of the switch......check each to ground for voltage. If you have voltage, then check the voltage reading across the two terminals themselves, you should read 0 volts across the terminals (indicating the switch is closed).
Hot surface ignitors are "wear-n-tear" items and should be the first place to check.
I hope you find this information to be very helpful to you moving forward.
Please let us know if you need further help. :-)

May 18, 2010 | Heating & Cooling

1 Answer

I have a 90 plus Ruud furnace that will work when I light the furnce with a match when the furnace is calling for heat


Sounds like the ignitor. Your unit most likely has a hot surface ignitor. The hot surface ignitor is located in front of your burners and usually has two white wires leading you to it. It is a wear-and-tear item that can be expected to need to be replaced every couple of years or so. It would not hurt to keep a spare near your unit at all times.
How to test a hot surface ignitor

Mar 29, 2010 | Heating & Cooling

1 Answer

Goodman gps100-4 heater, tied to heat pump intermittent gas valve operation. all safeties check ok.


If you have 24v to gas valve and a good ground to unit, check gas pressure with a manometer to ensure your input gas supply is correct..11-13" w.c. for LP and 5-10" w.c. for natural. If out of that range, valve may not open. You have to ensure you have 24v to valve after ignitor comes on..about 5-10 seconds after ignitor starts glowing. I would check from pos side of valve to chassis ground. If you do and your input pressure is good, you have a bad valve. Monitor the voltage to the valve to make sure it does not lose partial voltage during the 3-4 seconds it is energized before the flame sensor stops the sequence. And keep the manometer on the input side while the unit is firing so you can see if the pressure drops when the gas valve opens. If it does, your regulator outside is not working right.
If those look ok, see if you get output pressure when it does not fire. If you do...3.5" for nat, 10" for LP, the ignitor may not be getting quite hot enough every time.
Hope that helps a little

Jan 06, 2010 | Goodman PHKJ048-1 Air Conditioner

1 Answer

RHEEM RGLE-10EQAGS Gas Furnace - Intermitent. Fans come on, Hot surface Ignitor comes on, then sometimes Gas Valve opens and all is fine, Other times, gas valve doesn't open and Hot surface Ignitor goes...


The sequence is Igniter comes on, valve comes on, flame sensor senses flame. If no flame is sensed after 3 tries, a lockout occurs. If you have a volt meter, check for 24-27 Volts AC coming to the gas valve, if your getting voltage to the valve but no gas, your gas valve is defective. It could be a intermittent problem, no matter, still a bad valve. if no voltage to valve, defective circuit board. 

Dec 29, 2009 | Heating & Cooling

2 Answers

Dryer tumbles but no heat


I believe this unit has a hot-surface ignitor, and they work great, but do go bad eventually. The easy way to tell is to visibly see if the ignitor is operating during startup... can you get to it?
The hot-surface ignitor is easy to replace- (be careful not to touch it with fingers - like with halogen bulbs)

Dec 15, 2009 | Dryers

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