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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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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 | Heating & Cooling

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 | Heating & Cooling

1 Answer

I turn the thermostat on and the furnace tries to turn on three times before it turns itself off. The first time I see the gas blower turn on but it does not light the furnace up. The next two times I do...


This on blink of the light is a system lockout. It is caused when no gas is released to light the burner. The first thing to try is to turn the power off to the unit make sure your thermostat is off also. Turn the unit back on and make sure your gas is turned on. Then turn on the thermostat. Try this 3 or 4 times to make sure there is not air trapped in the gas line preventing ignition. If it lights after doing this you should check for a small gas leak at all fittings and shut off valves. The reason for this is to make sure you do not have a slow leak. If you smell gas turn off the furnace and your gas main valve and call a repair person. If you are unable to turn off the gas you should call the utility immediately. The cycle for your furnace is as follows. When your thermostate demands heat a signal is sent to your circuit board in the furnace and it turns on a exhaust fan to cause a draft to push air out the flu. (this fan is on 92% and higher funaces) This fan has two vacume lines that run to two vacume switches one is for the presence of vacume the other is for sensing the release of vacume. These are low voltage switches hooked into the 24v system. If the fan works and the switches sense vacume it then turns on the gas igniter this will be a glow bar and you will see it glowing. This in turn has a sensor that near it that can sense the heat from the glow bar igniter and it in turn turns on the gas by sending the 24v signal to the gas valve. If after 8 to 15 seconds the flame does not come on the system will reset and try again for a total of 3 times. If any of the above systems do not work your furnace will lock out because it thinks there is gas being dumped into the furnace. If the exhaust fan comes on you have 24v going thru your thermostat to the furnace. Then the vacume switches have to work. One is normally open the other normally closed. If you have a volt/ohm meter which can be purchased for as little as 10 to 15 dollars at a hardware store you can check these switches. You will need to set the thermostat to off and turn off voltage to your furnace for safety. Then locate the two switches by following the black rubber vacume lines from the exhaust fan housing to the switches. Pull the wires off the switches and with the meter set on ohms place the leads on the two terminals. While the meter is hooked up pull the vacume line off the fan housing and **** air in and out of the line the meter should swing back and forth as it senses vacume and the lack of it. If it does it is working. Then do the other vacume switch. Make sure to keep your wires and where the vacume lines go straight. You will also see a sensor mounted above and center where your burners are at it will have two wires going to it and it will be round it should show continuity ck it by removing the wires form it and touching the meter leads to the connectors the meter should respond showing continuity. There are two others under the burners on each side ck them the same. If any of your sensors have a pop ot button in the center press in on it yours should not this is an older version yours should be self reseting. The only other sensor is located in the blower for circulating the air. It is located on the right hand side of the blower housing with a red and yellow wire going to it. It has a reset in the center this sensor is used to trip if the heat in the blower housing gets to hot. This happens when the blower motor quits or is not able to move air fast enough due to restrictions. If the sensor has tripped you will feel and should hear an audible click when you press on the center button also if you check it for continuity it will show none and when you press the button it will show continuity. The next thing is the gas valve If all of the above work it is either the gas valve not opening or your circuit board. All of the parts are inexspensive until you get to the circuit board and the gas valve. The gas valve should be replaced by a repair person. You can replace everything else just make sure you turn off the power and pay close attention to the wiring. I hope this helps good luck. But not to down play the above make sure te top panel is in place put your hand on the gas valve and have someone turn on the thermostat. If the exhaust blower comes on and the ignitor glows you should then feel a click from the gas valve if you do not it us normally the circuit board. If you do and it still doesnt light you have no gas coming to your furnace. I hope this helps good luck

Sep 11, 2010 | Goodman GMS90703BXA Heater

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

2 Answers

Rheem tankless water heater wont lite


the system was not sized properly, you need to have a 3/4 gas line to the unit for the volume of gas it needs, the tankless water heaters need to have every bit of gas that is says, it sounds like who ever installed di not make sure you had enough gas comming in the house, you might have to either have a new meter installed or run the gas lind directly from the meter to the water heater and cap off the gas line thats there

May 05, 2009 | Rheem Tankless Hot Water Heater...

1 Answer

The hot water and central heating wont work together


what size of gas line is going into boiler and water heater? is it black iron ? natural gas or propane? have you checked gas pressure at water heater and furnace ? if they work fine individually then you have a problem with incoming gas pressure. Call gas company and ask them if they would come out and check gas pressure.

Feb 03, 2009 | Water Heaters

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 | Heating & Cooling

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 | Heating & Cooling

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 | Heating & Cooling

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