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My heater won;t work

My gas pack heater was working fine yesterday but today it will not light off, I usally here the ignitor clicking before it fires but now it doesn't do anything, the unit is only three years old

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Check induction fan motor first...then check the rubber tube and the switch it ataches too. this switch should close if the induction motor is running...but also...it HAS to be open before start up.

Posted on Dec 09, 2008

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Posted on Jan 02, 2017

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The unit cycles through all levels and then displays Ignition failure, code B2. I replaced the flame sensor, the ignitor, and there is natural gas at the gas valve.


Sequence of operation for most Gas fired furnaces...
Demand for heat from t-stat
Control board demands combustion chamber purge
(IDM /induced draft motor if it has one)
Control board tests all safeties (this is usually via
the IDM wiring.)
Control board sends 24v to PV at the gas valve igniting
the pilot OR control board sends voltage to the
ignitor as in yours.
Control board sends 24v to MV at the gas valve.
Control board allows time for heat exchanger to warm
then calls for blower operation.

Your sequence of operation? Won't be the flame sensor unless ignion has been achieved. If the ignitor is working/glowing red? Is the IDM working? Make & model#?

May 26, 2015 | Heating & Cooling

1 Answer

Hi I have Oska Gas Heater and Air Cleaner Model 43-540.


Gas pressure and type ok? What about the ignitor? Moving it might have caused issues with the ignitor.

Nov 25, 2013 | Heating & Cooling

1 Answer

Why heater coils glow?


It sounds like you're describing one of two things. The hot surface ignitor in a gas-fired furnace, or the resistive heat strips in an electric furnace.

The hot surface ignitor in a gas-fired furnace lights the burners. This ignitor in modern furnaces serves the same purpose as the standing pilot flame did in older furnaces. It provides the required heat to ignite the gas at the burners. Without an ignition source, a gas-fired furnace cannot provide heat. When the ignitor is activated it will glow bright orange or yellow.

The resistive heat strips in an electric furnace actually provide the heat to a home or building. When the furnace turns on, the heat strips are activated and usually glow orange when they reach peak temperature. In almost all cases, the heat strips are not easily seen or accessed without removing covers or panels inside the furnace.

Feb 28, 2011 | Heating & Cooling

1 Answer

It does not fire at all times igniter works, I can hear the gas valve when opens, some times it fires for a minute and some times does not fire at all


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution:You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

Dec 07, 2010 | Heating & Cooling

1 Answer

I have a rudd hot air gas furnace,ignitor sparks


to carmelmontgo; do you have a smart gas valve sometimes the wire connections get loose. remove wire connector then reinstall. also cleaning a flame sensor will work if the flame sensor is good. I would check the ground connection sometimes contaminated with rust. also I would check the gas pressure with a gas manometer...my email is alpharomeo@windstream.net

Jan 20, 2010 | Ruud UBHC Air Conditioner

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

Gas Furnace is not heating anymore.


the fan you hear come on at a call for heat is most likely just the inducer motor. the click you hear is probably the relay for the hot surface ignitor which should glow red, then in turn ignite the main burners. your going to have to determine if the ignitor is coming on. if it isnt the ignitor is bad and will need to be replaced. if it comes on and than shuts off after a few seconds the ifc board is probably at fault

Apr 09, 2009 | Heating & Cooling

1 Answer

Gas heater won't work


Which flame sensor did he replace? The pilot flame or the plenum temp. sensor.

Dec 14, 2008 | Carrier 38CKC036 Air Conditioner

1 Answer

Ignitor fires early or gas valve turns on too late - no ignition


Put your hand on the gas valve and see if the click of the valve is opening just before the ignitor goes off if it does your valve is going bad

Nov 12, 2008 | Heating & Cooling

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