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Not igniting, fan works, hot water working from same gas line, gas turned on to the furnace

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Posted on Nov 13, 2008

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Last night I came home and had no heat from my trane vx95. It is a very new unit. We took panel off and saw a pattern of light (see video) that might suggest problem.


There should be a label inside the furnace somewhere that shows what the blink codes mean. There are usually a couple of things that can cause a furnace to not heat while the fan is on.

1. The hot surface igniter is broken and is not able to ignite the gas, this will prevent the gas from flowing as a safety measure.
2. No gas supply to the furnace. Perhaps your gas was shut off? If you gave a gas range or water heater, make sure they are working. If so, then gas supply isn't the problem.
3. Problem with the wiring to the thermostat. (I had this problem once and found that someone had brushed up against the thermostat in the hall and the front half had separated from the back half of the unit. This caused the connections to come loose. My fan was on but it would not turn on the outside compressor for the A/C.)
4. The condensation plastic drain tank is clogged and not draining. Check that the hose coming out of the furnace is draining.
5. A problem with the circuit board itself. (Which seems to have power and can operate the fan still.) Unfortunately there aren't many other tests outside of this that wouldn't require calling a certified HVAC person in.

Nov 24, 2012 | Air Conditioners

1 Answer

Rv heater keeps running


Try cycling your disconnects a few times. Turn off the propane at the tank. Turn on the vent fan. Then turn on the furnace. Yes' I said turn off the gas and turn on the furnace. As the furnace tries to ignite "you will hear the spark" SLOWLY open the gas valve. I say slowly because the tank valve has a safety feature that stops the flow of gas if it is going to fast. By opening the valve slowly the gas will pressurize the line and the valve will stay open.
Here is the reasoning behind this. If your refrigerator, water heater or anything else gas was turned on while the gas valve was off the pressure left the line. When you turned the gas back on there was a rush that let the over sensitive safety valve kick out.

Some models have an electric safety valve connected after the regulator and it is controlled by the gas leak detector. If that detector is set off by anything..hairspray, Frebreeze, bug spray, silicone spray etc... it will turn off the gas at that electric solenoid. Clear the offending spray and reset the detector.

Apr 13, 2012 | Air Conditioners

2 Answers

When temp is below freezing furnace will not ignite. Fan will turn on but there's no combustion. eventually it kicks on but shuts down after a few min. We only have this problem in the really cold temps.


Check the condensate drain lines in the furnace. disconnect the power and remove the cover. Remove the black drain lines and flush and clean with a water and clorox solution. Then check the rest of your condensate drain line for blockage. the blockage is freezing and causing the furnace to shut down for a pressure problem.

Jan 25, 2011 | Air Conditioners

1 Answer

Gas furnace does not work


Simple things first. Is the gas turned on? Some furnaces have a gas line fitting to shut off during summer months. The gas valve should line up in the direction of the gas line. Two: is the pilot lighting. Can you see a flame? It may also have an electronic igniter. When it comes on you should see a glowing hot stick or something similar in the pilot viewing hole. If you have a combination valve for you pilot. You must first turn it to pilot, hold it in and light it manually. Hold that button in until the pilot stays lit, then trun it to "on". If the thermostat is in the "heat " position and the thermostat is set to call for heat by turning the emo up higher than the current room temperature, the main flame should come on. Otherwise something complex is wrong with your system

Sep 08, 2010 | Air Conditioners

2 Answers

I have the same Ruud Achiever unit & it's not working.


It sounds like it will need a hot surface igniter. This is the part that glows when furnace is turned on, and tells gas valve to release gas for it to ignite. At that point funace is lit, it heats up flame sensor witch inturn tells fan to start.

Sep 30, 2009 | Ruud UBHC Air Conditioner

1 Answer

Rheem gas furnace pilot lights, but no burners or fan


If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.

Jan 06, 2009 | Air Conditioners

1 Answer

Trouble shooting manual for Model# RGUJ-05EA-ER RHEEM GAS FURNACE


replace the gas valve....test for 24volt at the gas valve input.  if you have this then it's a def gas valve relay not working.

Dec 09, 2008 | Air Conditioners

1 Answer

150000 1974 national gas forced air furnance does the fan come on the same time the gas comes on. ...


not familiar with that particular model but on virtually every type and style of furnace i have worked on in the last 21 years. the fan is delayed. usually the burner lights then 3 to 5 minutes later after the heat exchanger has gotten nice and hot the fan comes on and blows nice and hot air. on old furnaces there was and is a switch usually on the upper right side of the furnace bulkhead that has a spring like device that heats up and rotates till it makes a set of contacts that turn the fan on. if it gets to hot the set of contacts breaks the power to the gas valve and shuts down the burner. as the furnace cools down on shut off there is a third set of contacts that open to turn off the fan so you don't get a draft. sometimes the stat can be wired up wrong, and it will bring the fan on right away ,and air will be cool and drafty till furnace catches up.

Nov 12, 2008 | Air Conditioners

1 Answer

I have a gmpn-80 janitrol 90% eff gas furnace,it is only 15 months old,my condisation tray is melting and cracked do to heat in which case leaks water all over....why would this be happening?


Most likely the cause is that the furnace is firing too hot. When a furnace is installed and set up, the manifold gas pressure and fan speed has to be set by the technician so that the temperature rise through the furnace is a maximum of 50 deg F (i.e. if air enters the furnace at 68 deg F it come out no hotter than 118). The target temperature rise on any gas furnace is anywhere between 30 and 50 deg F. If the furnace runs too hot, either the manifold gas pressure must be turned down or the fan speed must be turned up to keep in this range.

Jun 28, 2008 | Air Conditioners

2 Answers

Carrier Weathermaker gas 8000 will not ignite


Your hot surface igniter may be bad. It may be cracked which would prevent it from starting the burner flame.

May 21, 2008 | Air Conditioners

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